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SaladShooter

electric slicer/shredder
Slices or shreds vegetables, fruit, and cheese. Just point and shoot right where you want. Cleanup is easy. Dishwasher safe. Stores anywhere.

Instructions

IMPORTANT SAFEGUARDS
2006 by National Presto Industries, Inc.
This is a Listed appliance. The following important safeguards are recommended by most portable appliance manufacturers.
To reduce the risk of personal injury or property damage when using electrical appliances, basic safety precautions should always be followed, including the following: 1. Read all instructions before using this appliance. 2. To protect against the risk of electrical shock, never put the motorized base, cord, or plug in water or other liquids. 3. Close supervision is necessary when any appliance is used by or near children. 4. Unplug from outlet when not in use, before putting on or taking off parts, and before cleaning. 5. Do not operate any appliance with a damaged cord or plug, or in the event the appliance malfunctions, or is dropped or damaged in any manner. Return the appliance to the Presto Factory Service Department (see page 5) or to the nearest Presto Authorized Service Facility for examination, repair, or electrical or mechanical adjustment. 6. The use of attachments not recommended or sold by the appliance manufacturer may cause fire, electric shock, or injury. 7. Do not use outdoors. 8. Do not let cord hang over edge of table or counter or touch hot surfaces, including the stove. 9. Avoid contact with moving parts. 1 0. Never feed the food through the food chamber with your hands; always use the food guide. 1 1. Keep fingers out of the slicing/shredding chute. 1 2. The metal portions of the slicing and shredding cones are sharp. Handle with care. 1 3. Do not use the slicer/shredder for other than intended use.

SAVE THESE INSTRUCTIONS

This product is for household use only.
Important safety information Connect the power supply cord to a polarized outlet only. As a safety feature, this appliance has a polarized plug (one blade is wider than the other). This plug will only fit in a polarized outlet one way. If the plug does not fit fully in the outlet, reverse the plug. If it still does not fit, contact a qualified electrician. Do not attempt to defeat this safety feature.

Getting Acquainted

Before using your electric slicer/shredder, study the diagram to the right to become familiar with the various parts of the unit and read the instructions carefully. Before initial use, and after each subsequent use, wash all parts except the motorized base in warm, sudsy water. Wipe the motorized base with a damp cloth to clean. Never immerse the motorized base in water or any other liquid.

Food chamber

ON-OFF latch
Slicer/shredder power switch
Slicing/shredding chute Driving end
Motorized base Interlock bracket Bracket slot
How To Use Your Slicer/ Shredder
1. Select the slicing or shredding cone and insert it, narrow end first, into the slicing/ shredding chute (Fig. A). Then attach the twist-lock ring by turning clockwise until it locks into place (Fig. B). The metal portions of the slicing and shredding cones are sharp. Handle with care.

Shredding cone

Food guide Twist-lock ring

Fig. A

Food chamber assembly Food chamber assembly
2. Attach the food chamber assembly to the motorized base. With the food chamber Slicing cone assembly held at an angle, fully insert the driving end of the assembly into the socket of the motorized base (Fig. C). Next, while pushing the food chamber assembly firmly in towards the handle, rotate the assembly clockwise until it is upright and it is centered with the handle.

Fig. B

Check to be sure that the interlock bracket on the food chamber assembly (Fig. D) has been fully captured in the bracket slot located at the front of the motorized base (Fig. E). If it is not captured, the TwistSlicing/ lock ring shredding chute unit may not operate and the food chamber assembly will fall off the base. Rotate the food chamber assembly clockwise making sure the 3. Plug cord in and load the food chamber. interlock bracket engages with the bracket slot. For best slicing and shredding results, it is important that the food be prepared Bracket Socket slot properly and placed in the food chamber as follows: Cut food so that it will fit easily and loosely into the food chamber. Food that does not fit loosely in the food chamber may become wedged in the food chamber and therefore will not discharge properly. If it is too large to fit loosely in the food chamber, cut it into smaller pieces.
Driving end Interlock bracket Interlock bracket

Bracket slot

Fig. C

Fig. D

Fig. E
Stack food into the food chamber upright for short slices or horizontally for longer slices (Fig. F). 4. Begin slicing or shredding. Use the slicer/shredder power switch to turn the unit on and off. Push food through the food chamber using an even pressure on the food guide. 5. The sliced or shredded food will be discharged from the open end of the slicing/ shredding chute, allowing you to easily shoot toppings right into your mixing bowl or onto your salad, pizza, or dessert so there are no extra bowls to clean. See the Suggested Uses on page 4 for great ideas for slicing and shredding.

Fig. F

Stack food upright for short slices
Stack food horizontally for longer slices

Helpful Hints

All food slices and shreds better when it is fresh and firm. Semi-soft cheeses should be refrigerated overnight or placed in the freezer for approximately 30 minutes before shredding. Hard cheeses should be at room temperature. All unprocessed cheeses can be shredded successfully with this unit. It is not recommended that you use soft or processed cheese as it may clog the unit. Use light pressure on the food guide for thinner slices and shreds, and firm pressure for thicker slices and shreds. Certain soft fruits such as strawberries and kiwi should be firm not overripe to slice. These types of fruits can also be placed in a freezer for a few minutes before slicing. Some foods can be double processed; for instance, you can shred carrots and run them through again for grated carrots. Cheese can be shredded twice for grated cheese. Place the food upright in the food chamber until it is full and apply pressure evenly with the food guide. Failure to properly load the food chamber or to apply even pressure may result in the food falling over in the food chamber. This will result in uneven slices. It is normal for bits of food to remain on top of the slicing/shredding cone after you have completed slicing or shredding. The unit is not designed to shred onions or oranges, slice cheese or chocolate, or process meats and tomatoes. To avoid personal injury or damage to the unit, do not attempt to slice foods that are too hard to be cut with an ordinary knife. This slicer/shredder was not designed to chop ice or grind coffee beans. You may damage the unit. Plastic parts may become stained after processing certain foods such as carrots. Should the unit become stained, pour a small amount of cooking oil on a paper towel and wipe the stained area. For best results, do this as soon as a stain is noticed.

Use Guide for the Slicing and Shredding Cones:
Insert the slicing or shredding cone in the food chamber as instructed in the How To Use section on page 2. The metal portions of the cutting cones are sharp; handle with care. Suggested Foods Shredding Cone Slicing Cone

Suggested Foods

Shredding Cone

Slicing Cone

Fruits Apples Bananas Coconut Kiwi Maraschino Cherries Nectarines Peaches Pears Strawberries Vegetables Cabbage Carrots Celery Chili Peppers Cucumbers Green Peppers Lettuce
Vegetables (Continued) Mushrooms Onions Potatoes Radishes Sweet Potatoes Turnips Zucchini Other Foods Bread Cheese Chocolate Cookies Crackers Hard-Cooked Eggs Nuts Olives Pickles

Suggested Uses

Create beautiful fruit salads by slicing bananas, apples, peaches, nectarines, and pears. Turn an ordinary frozen pizza into a gourmet delight by adding your own fresh shredded cheese and sliced peppers, mushrooms, olives, onions, etc. Chop nuts for baking or garnishing. Crumb crackers for pie crusts or casserole toppings. For terrific tacos and taco dip, shred cheese and slice lettuce, olives, and onions. Decorate a cream topped pie or a fluffy icing cake with shredded baking chocolate. Make delicious, creamy coleslaw by shredding fresh cabbage and carrots. Shred potatoes for nutritious hash browns or potato pancakes. Slice them for delicious American fries or homemade potato chips. Shred hard cooked eggs for sandwich spreads, salad toppings, and deviled eggs. For more suggested uses, visit us at www.saladshooter.com.

Questions & Answers

Occasionally my slicer/shredder will not turn on, or the ON-OFF switch works intermittently. Why is this? Most likely the food chamber assembly is not attached properly to the motorized base. The slicer/shredder power switch is designed to work only when the food chamber is centered with the handle on the motorized base. Either the ON-OFF latch on the motorized base is not positioned directly between the two tabs on the food chamber (Fig. G) or the interlock bracket on the bottom of the food chamber assembly (Fig. H) is not positioned in the bracket slot on the front of the motorized base (Fig. I). Should the ON-OFF switch operate intermittently, check the position of the food chamber. Realign it so it is centered properly. Sometimes I have trouble disengaging the food chamber assembly from the motorized base. What am I doing wrong? You probably forgot to turn the slicer/shredder power switch off. The unit is designed with a safety switch feature which prevents the food chamber from being removed when the slicer/shredder power switch is in the ON position. Why do I sometimes have to use a lot of pressure to get food out of the slicing/ shredding chute or no food comes out at all?
Fig. H Fig. I Any of the following may be occurring: 1. You have packed the food chamber too tightly. Foods should fit loosely in the food chamber. Leafy vegetables, such as cabbage and lettuce, should be cut into chunks the size of the food chamber.

Food chamber Motorized base ON-OFF latch

Fig. G

Interlock bracket
2. The food is not fresh and firm. All food slices and shreds better when it is fresh and firm. 3. Pieces of the fruit or vegetable may have wrapped around the cutting cone during processing or may have become wedged in the cutting cones preventing food from coming out. If this occurs, simply disconnect the unit from the outlet, remove the cutting cone, and clean out the buildup of food. 4. You may be slicing or shredding a hard vegetable, such as a sweet potato, or shredding cheese. Cheese and hard vegetables may require more pressure on the food guide. Sometimes when slicing or shredding hard vegetables or when shredding cheese, the motor may sound as if it is laboring. This is normal.

Care and Cleaning

After each use, your slicer-shredder should be cleaned thoroughly. All parts, except the motorized base, are completely immersible and dishwasher safe. Wash these parts in warm, sudsy water, rinse, and dry. If washing in the dishwasher, use the top rack or the rack farthest away from the heating element. Be sure the parts are positioned so they will not fall through the rack. The motorized base may be cleaned with a damp cloth. When removing the food chamber from the motorized base, be sure the power switch is off and the unit is unplugged (the food chamber cannot be removed with the switch in the ON position). Never immerse the motorized base in water or any other liquid. Note: Plastic parts may become stained after processing certain foods such as carrots. Should the unit become stained, pour a small amount of cooking oil on a paper towel and wipe the stained area. For best results, do this as soon as a stain is noticed.
Consumer Service Information
If you have any questions regarding the operation of your Presto appliance or need parts for your appliance, call our Consumer Service Department weekdays 8:00 AM to 4:30 PM (Central Time) at 1-800-877-0441 or write: National Presto Industries, Inc. Consumer Service Dept., 3925 North Hastings Way, Eau Claire, Wl 54703-3703 You may also contact us at our website www.GoPresto.com. Inquiries will be answered promptly by telephone, letter, or email. When writing, please include a phone number and a time when you can be reached during weekdays if possible. Any maintenance required for this product, other than normal household care and cleaning, should be performed by our Factory Service Department or any Presto Authorized Service Station. Be sure to indicate date of purchase and a description of defect when sending an appliance for repair. Send appliances for repair to: Canton Sales and Storage Company Presto Factory Service Dept., 555 Matthews Drive, Canton, MS 39046-0529 Appliances may also be repaired at any Presto Authorized Service Station. Check your yellow pages for Service Stations near you. The Presto Factory Service Department and Presto Authorized Service Stations are equipped to service all PRESTO appliances and supply genuine PRESTO parts. Genuine PRESTO replacement parts are manufactured to the same exacting quality standards as PRESTO appliances and are engineered specifically to function properly with its appliances. Presto can only guarantee the quality and performance of genuine PRESTO parts. Look-alikes might not be of the same quality or function in the same manner. To ensure that you are buying genuine PRESTO replacement parts, look for the PRESTO trademark.

PRESTO Limited Warranty

This quality PRESTO appliance is designed and built to provide many years of satisfactory performance under normal household use. Presto pledges to the original owner that should there be any defects in material or workmanship during the first year after purchase, we will repair or replace it at our option. Our pledge does not apply to damage caused by shipping. To obtain service under the warranty, return this PRESTO appliance, shipping prepaid, to the Presto Factory Service Department or to the nearest Presto Authorized Service Station. When returning a product, please include a description of the defect and indicate the date the appliance was purchased. We want you to obtain maximum enjoyment from using this PRESTO appliance and ask that you read and follow the instructions enclosed. Failure to follow instructions, damage caused by improper replacement parts, abuse or misuse will void this pledge. This warranty gives you specific legal rights, and you may also have other rights which vary from state to state. This is Prestos personal pledge to you and is being made in place of all other express warranties. NATIONAL PRESTO INDUSTRIES, INC. Eau Claire, Wl 54703-3703
U.S. Patents 4,884,755 and 5,680,997; Other Foreign Patents. Form 72-685A

Feature G Feature F Feature D Feature B Feature H Feature C
Feature I Feature E Feature J

Feature A

Feature K Feature L
Figure 2: Views of Front Housing showing important features of the design pertaining to the functional requirements.

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Rear Housing
Requirements: The back half of a 2-piece housing that encloses the Motor, gears, and electrical components. Provides a pivot point for the On-Off Switch Assembly. Connects to the Front Housing by means of a complementing perimeter lip and 4 screws. Has 2 feet that make contact with the operating surface (e.g. countertop). Provides ventilation to allow heat from the Motor to escape during operation. Interior Supports for the gearing. Provides part of a handle that can be used for picking up the product during operation.
The Rear Housing attaches to the Front Housing by the means of 4 screws. There are two small pillars (A) on the interior of the Rear Housing that are used as supports for the axes of the rotating gears. The Support attaches to the upper pillar and acts as a bearing for the Large Gear to rotate in. There are 4 extrusions (B) along the interior perimeter that complement the wire holders of the Front Housing. These extrusions essentially keep the wires in place so they cannot get in the way of the gears. There are 4 vents (C) on the rear of the Rear Housing that allows air to diffuse through the housing. The handle of the Rear Housing is cut out because the On-Off Switch Assembly needs to be inserted into the pivot point (D). The Cover contours the handle cut out and mates to the Rear Housing by the use of 2 press-fit pins (E). In addition to being press-fit, the pins were also glued in place.

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Feature D

Feature B Feature E

Feature C
Figure 3: Views of Rear Housing showing important features of the design pertaining to the functional requirements.

Chamber

Requirements: Provide a passage for food to reach the Cutter Blade. Unlock safety mechanism to allow Motor and thus the Cutter Blade to be engaged. Provide housing for the Cutter Blade to fit snuggly inside, without hindering connection to the Large Gear. Securely connect to the Front Housing. Provide a safety mechanism so it cannot be removed once the Motor is engaged. Clearly indicate warning messages to user.
The Chamber is an essential component to the Salad Shooter. Its functionality deals with the Cutter Blades, location of the food, as well as nearly every safety mechanism. The long chamber feature attached to the conical base provides a means by which food can reach the blade. This features shape is not significant, other than the fact that it matches the outer shape of the Guide and the different sized curves at each end guarantee the Guide is inserted in 6|Page

The Arm is also a very simple design, but is one of the more important parts to the assembly. This piece needs to be rigid and have good strength for the safety mechanism to work properly and needs to withstand the constant cycle of being turned on and off thousands of times. When the Chamber is twisted into place and the On-Off Switch is placed to the on position, the Arm moves forward with the On-Off Switch and (A) prevents the Chamber from twisting off and being removed. There are two extrusions on the Chamber that (A) slides in between, locking it into place. The Arm is 13 | P a g e
securely attached by the two pins (B) that slide into the two holes on the On-Off Switch allowing it to pivot freely when moved from the on to off position. When the On-Off Switch is moved to the on position this allows the Arm at point (C) to push against the outer electrical contact and makes a closed circuit with the inner one allowing electricity to flow to the motor. The other safety mechanism at the bottom of the Chamber has to be properly in place at the same time for the circuit to be closed to allow current to the motor. Feature A Feature B
Figure 7: Views of Arm showing important features of the design pertaining to the functional requirements.
Requirements: Hold the switch assembly in place. Provide a smooth, easy to hold handle. Make the Rear Housing handle more rigid. Provide the user adequate grip when using Salad Shooter. The Cover plays a crucial role in holding the switch assembly in place in Rear Housing. At point (A) there is an extruded cut that allows the pins on the side of the switch to sit in and pivot with minimal friction. The Cover completes the handle and Rear Housing assembly. The Cover allows for a clean look and smooth finish with the help of two pins on

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the inner side of the Cover that are pressed and glued, for extra strength, into two holes on the Rear Housing. These two pins and holes make the handle more rigid because they are not only pressed into place but are also glued, which made it very difficult to disassemble the handle.
Figure 8: Views of Cover showing important features of the design pertaining to the functional requirements.

Small Gear

Requirements: Transfer torque from the Motor Gear to the Metal Gear Provide gear reduction to increase torque and decrease speed Move the axis of rotation Hold the Metal Gear in place Have correct teeth profiles and number of teeth
The Small Gear is a spur type gear consisting of 96 teeth on its outer diameter and 10 teeth on its inner diameter. Feature (A) shows the Small Gears outer teeth which mates with the gear teeth of the Motor Gear. Feature (B) shows the Small Gears inner teeth which mate with the teeth of the Metal Gear. In order for the gears to mate they must have the same teeth profile. The teeth of feature (A) are different from the teeth of feature (B) because they have a larger pitch diameter. The Metal Gear has the same 15 | P a g e

Requirements: Push food against Cutter Be able to be modified for different sized food Keep the operators hands from getting close to the Cutter Ribs to help with handling
The Guide is used by the user to push food against the desired Cutter as it spins. To do this the food is placed inside the Chamber of the Salad Shooter. Then the Guide is inserted and is manually forced down causing the food to pass through the Cutter. The Guide can be changed for different size loads of food by taking out a small removable portion called a Pusher (A) that is held in place by a tab (B). Once removed the Guide is inserted in the Chamber and the food is placed were the Pusher was located. The Pusher is then used to force the food through the Cutter. The Guide and Pusher both have ribs (C) that keep them from getting stuck to each other and the Chamber allowing for easy handling. The main purpose for the Guide is to allow the user to push the food through the Chamber and into the rotating Cutter without having to use his or her hands making the Salad Shooter much safer to operate.

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Figure 13: Views of Guide showing important features of the design pertaining to the functional requirements.

Funnel Guide

Requirements: Direct freshly cut food from the Salad Shooter more accurately Connect to the Twist Lock
The Funnel Guide provides a tidy way to collect freshly cut food. This allows for the user to more or less aim the Salad Shooter at a container instead of having the cut food flying out of the Salad Shooter in random directions. The Funnel Guide is designed so its larger diameter hole attaches to the Salad Shooters Twist Lock. This is done by a press fit created between a lip that runs the inner circumference of the Funnel Guides larger diameter hole (A) and several tabs that run the outer perimeter of the Twist Lock.

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Figure 14: View of Funnel Guide showing important features of the design pertaining to the functional requirements.
Requirements: Rotate Cutter Plug into a standard wall socket Provide enough torque for Cutter Maintain a constant speed A Fan to help cool the Motor The electric Motor has a metal shaft (A) with an Metal Gear (B) at one end that drives two plastic gears. The plastic gears interact with a socket in the Front Housing that the Cutter connects to. When the Motor is switched on it rotates the metal shaft which in turn rotates the plastic gears and the socket. It is held in place inside the Front Housing by a Bracket (C). The Motor is designed to be plugged into a standard North American wall socket with a type A plug. It provides 35 mNm of torque which allows the Cutter to processes a load of food without slowing it down. A constant speed is desired so the slices of food coming from the Cutter are roughly the same size. This Motor rotates the Cutter at a rate of 212 RPM. A Fan (D) is used to move air around the motor by forcing hot air outside of the Front and Rear Housing. This helps cool the motor as the hot air is replaced by cooler ambient air.

The current and voltages were found using a simple experiment and a voltmeter. To find the current, the circuit was broken and the voltmeter was wired in series allowing the circuit to be reconnected through the voltmeter. (See Figure 25) Then the unit was powered on and the volts were measured under different load conditions. The voltage was found by the same means with modifications to the wiring of the voltmeter.

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To measure voltage the meter was wired in parallel with the flow of power, contact was made at any two points in the circuit loop, and a differential voltage was determined. (See Figure 25) The data obtained from these experiments is shown in Table 1.
Figure 25: Experimental setup of current measurements. (left) Experimental setup of voltage measurements. (right) Table 1: Experimental data for electrical analysis under various load conditions.
Free Current (A) Voltage (V) Power (W) 0.7 123.5 86.45
With Gears 0.66 123.5 81.51
Max Load (apples) 0.84 123.5 103.74
Unit Recommended Max Load 0.114
With the data from Table 1, it was determined that the unit operating under a load uses 91% of its potential maximum power use. Furthermore from the thermal analysis that was performed, 17.3 watts was lost to the air. The loss occurred under no load, just the gears, and it accounts for about 21% of the power lost as heat to the air. Also this does not account for all the power lost as heat, it was estimated that another 10-15% of power is lost to the adjacent plastic components and to the surroundings from there. In addition, AC motors use a lot of power to create the electromagnet that is

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used to rotate the motor. [Oriental Motor] This adds to the inefficiency of the motor chosen for the Salad Shooter.

Mechanical Analysis

Gear Ratios The gear ratio is found by dividing the total number of teeth of the idler (larger gear) by the total number of teeth of the pinion (small gear),. The diameters of the gears
do not have to be exact as long as the number of teeth is correct and the teeth profiles match and can mate (Source: BlueInk). The gear ratio between the Small Gear and the Drive Gear is The Small Gear and the Metal Gear have a gear ratio of 1 to 1 so. This means

Antifriction metal is a good choice for gears because its low friction reduces the amount of power needed to turn the gears (Source: Probert Encyclopedia). The reason a ferrous gear was used other than a plastic gear is because of the higher strength of a metal gear. Because the gears diameter is small compared to its length, a higher strength is necessary to undergo the effects of torsion from the small and large gears. Electrical Insulating Contact Washer: Silicone Rubber The electrical insulating contact washer is not magnetic so all ferrous materials are ruled out. From its stiffness and durability it seems to be a type of rubber or a cardboard like material. Its mass was found to be 0.040 g and its volume to be 29.48 mm 3 this gives a density of 1356.852 kg/m3. The density of silicone rubber is 1246.5 kg/m3 thus silicone rubber is the concluded material. Silicone rubber is often used in electronics for electrical insulation. Its electrical qualities do not change significantly under environmental stresses like heat, cold, and moisture. It is also inert so it has no taste or smell which is important when dealing with food processing appliances. It is these properties which make silicone rubber a good choice (Source: Dow Corning). Contact: Copper When the magnetic test was applied to the CONTACT the part did not interact with the magnet. However the material is initially assumed to be copper and copper is magnetic but not in a noticeable way. To confirm the assumption the density is calculated. The contact possessed a mass of 0.433 g and a volume of 45.25 mm3 which gives a density of 9569.061 kg/m3 which is close to the density of copper 43 | P a g e
at 8930 kg/m3 (Source: The Engineering Toolbox). Copper is a good choice for this application because of its great electrical conductivity (it is second in electrical conductivity only to silver) (Source: WebElements). Gear Rod: Steel The volume of the steel rod came out to be 408 mm3 and the mass was measured to be 3.115 g which gives a density of 7634.804 kg/m3. This is close to the density for steel which is 7850 kg/m3 so steel is the concluded material for the gear rod. This makes sense because the gear rod is used to support the gear which requires a material with considerable strength and stiffness which steel possess. Blade: Steel The blade interacted with the magnetic so it is a ferrous material. The initially assumed material was steel due to its appearance and weight. The volume is taken from SolidWorks since the blade is too large to fit into the graduated cylinder. The volume taken is 4326.43 mm3 and the mass measured is 33.440 g. This gives a density of 7729.236 kg/m3 which is close to the density of AISI 1035 stainless steel which is 7850 kg/m3 (Source: SolidWorks). This is a good choice for the blade because steel has a high enough strength to not deform under the cutting of the food. Because it is stainless, food will not tarnish its appearance and the blade will stay shiny.

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Manufacturing

Manufacturing Processes

Injection Molding Used for the following parts: Guide, Pusher, Chamber, Twist Lock, Funnel Guide, Front Housing, Back Housing, Holder, On-Off Switch, Arm, Cover, Larger Gear, Small Gear, Washer Used with the following materials: Thermoplastic Polyester, PVC, Acetal, Silicone Rubber In the injection molding process, the desired part is first machining out of steel. Next, this part is used to make a mold that has a cavity with an exact outline of the machined part. Finally, the plastic material is superheated and poured into the cavity. Once the material hardens, it is removed from the mold yielding a plastic replica of the steel part. Automated Milling Used for the following parts: Used with the following materials: Curved Contact, Straight Contact, Rod, Metal Gear Steel, Copper, Antifriction Metal
In the milling process, the block of the desired material is secured between adjustable brackets. The milling machine rotates a tool bit at a very high angular velocity. The tool bit travels an automated path across the material block, cutting as it goes, producing the required profiles and features for the part. Cutter Process Used for the following parts: Used with the following materials: Thin Cutter, Thick Cutter, Shred Cutter, Ripple Cutter Thermoplastic Polyester, Stainless Steel
The four Cutters require a unique process that blends the processes of milling and injection molding. To produce one such Cutter the blade must be made first. Each blade is milled out of stainless steel to meet its functional requirements. Once the blade is complete it must be placed into the cone body. This is done through an injection molding process. Two blades of one specific design (each attachment cuts twice per revolution) are placed into a mold 180 degrees opposite each other. Both blades are held in place by a pair of holes in each blade that attach to the mold casing. Thermoplastic polyester is used for the material for the cone base. It is superheated into liquid form and is injected into the mold of the desired shape. The plastic then cools and hardens around the pair of blades to produce a single cutting tool.

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Assembly Process
Parts Required 1 adjustable food guide (Guide) 1 adjustable food guide pusher (Pusher) 1 food chamber (Chamber) 1 twist lock ring (Twist Lock) 1 funnel guide (Funnel Guide) 4 cutting attachments (Cutter) -thin slice attachment (Thin Cutter) -thick slice attachment (Thick Cutter) -medium shred attachment (Shred Cutter) -ripple cut attachment (Ripple Cutter) 1 front housing body piece (Front Housing) 1 back housing body piece (Back Housing) 1 plastic holder for copper contacts (Holder) 2 curved copper contacts (Curved Contact) 1 straight copper contact (Straight Contact) 2 riveting cylinders (Rivet) 1 electrical contact-insulating washer (Washer) 1 motor (Motor) with a long wire (Long Wire), a short wire (Short Wire), and a metal motor bracket (Bracket) 1 unattached wire (Free Wire) 1 plastic gear support (Support) 1 metal gear rod (Rod) 1 on-off switch (On-Off Switch) 1 on-off switch arm (Arm) 1 back housing cover plate (Cover) 1 large plastic gear (Large Gear) 1 small plastic gear (Small Gear) 1 metal gear (Metal Gear) 2 plastic wire connectors (Connector) 4 0.6 in long 6/32 in diametric screw (Long Screw) 2 0.5 in long 6/32 in diametric screw (Medium Screw) 1 0.3 in long 6/32 in diametric screw (Short Screw) Tools Required glue applicator (Glue) lubrication applicator (Lube) Phillips head screwdriver (Screwdriver) riveting presser (Riveter) hammer (Hammer)

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Pre-Assembly The following steps are to be completed before the bulk manufacturing. Gluing is done early in order to give the glue time to set. Lubrication is done early in order to contain the lube so that the assemblers hands do not become slippery. Hammering is done early because it requires a great degree of force and should be completed in a controlled environment. 1. Pick up the Metal Gear with the off hand. 2. Pick up the Glue with the dominant hand and apply glue to half of the gears shaft.
3. Set down the Glue. 4. Pick up the Small Gear with the dominant hand and insert the hole over the glued end of the Metal Gear until the Metal Gear just barely exits the hole in the Small Gear.
5. Set the gear assembly down and allow it to set.

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6. Pick up the Lube with the dominant hand. 7. Pick up the Large Gear with the off hand, holding it without touching the gear teeth, and apply lube to the complete rim of gear teeth.
8. Set down the Large Gear. 9. Pick up the Small Gear with the off hand, holding it without touching the gear teeth, and apply lube to the complete rim of gear teeth.
10. Set down the Small Gear and the Lube. 11. Pick up the Front Housing with the off hand. 12. Pick up the Rod with the dominant hand and place in the central hole (below the large opening) in the Front Housing.

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13. Pick of the Hammer with the dominant hand, holding it by its base. 14. Bring the Hammer to the Rod and hammer it into the Front Housing (great force is required).
15. Set down the Front Housing and Hammer.

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Manufacturing Assembly The following steps represent the bulk manufacturing assembly and are to be completed after the pre-assembly. The Motor is the only component, other than those listed in the preassembly, which comes pre-assembled as it is purchased from a separate manufacturer. 1. Pick up the Holder with the off hand, holding it by the outer edges of the base, and orient so that the flat end of the base is on a smooth surface.
2. Pick up a Curved Contact with the dominant hand and place on the Holder so that the hole in the copper is over the left hole in the Holder and orient the Curved Contact so that it travels up and to the right. 3. Pick up the Long Wire with the dominant hand and place the exposed end around the hole in the Curved Contact. 4. Pick up the Rivet with the dominant hand and insert through the back of the Holder.

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54. Pick up a Long Screw with the off hand and insert into the hole on the front of the Front Housing, above and to the left of the large hole in the Front Housing.
55. Hold the Front Housing steady with the off hand. 56. Insert the head of the Screwdriver into the cap of the screw and rotate the Screwdriver clockwise until the screw is tightly fastened.

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57. Pick up a Long Screw with the off hand and insert into the hole on the front of the Front Housing, above and to the right of the large hole in the Front Housing.
58. Hold the Front Housing steady with the off hand. 59. Insert the head of the Screwdriver into the cap of the screw and rotate the Screwdriver clockwise until the screw is tightly fastened.

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60. Set down the Screwdriver. 61. Pick up the Glue with the dominant hand and apply glue to the rim around the opening in the handle of the Back Housing. 62. Set down the Glue. 63. Pick up the Cover with the dominant hand and insert the hole in the cover over the OnOff Switch and press the Cover against the glued surface area.
64. Release both hands and allow the glue to set.

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Customer Assembly The following steps represent what the customer has to do in order to make the product operational after purchase. These steps are completed after the manufacturing assembly in order to test whether or not the product passes inspection. The customer assembly is subsequently carried out in reverse to prepare the product for packaging. 1. Pick up the Front Housing with the off hand 2. Pick up the Chamber with the dominant hand insert the smaller end of the conical cavity into the circular cavity in the front of the Front Housing. Orient the Chamber so that the chute is pointing upwards and towards the left. Rotate the Chamber clockwise until the chute is vertical and the entire part locks into place.

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3. Pick up the desired Cutter with the dominant hand and insert the hexagonal shaft through the conical section of the Chamber and into the hexagonal hole in the Large Gear.
4. Pick up the Twist Lock with the dominant hand and, leading with the portion with a larger diameter, place it around the circular end of the Chamber. Rotate the Twist Lock clockwise until the part locks into place.

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5. Pick up the Funnel with the dominant hand and, leading with the portion with a larger diameter, place around the circular end of the Twist Lock and press until the Funnel snaps into place.
6. Pick up the Guide with the dominant hand and, leading with the end without a rim, insert it into the top of the Chamber so that the shapes of the two parts align and the Guide slides all the way down.

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7. Pick up the Pusher with the dominant hand and, leading with the end without a rim, insert it into the top of the Guide so that the flat portion of the Pusher shaft aligns with the flat wall inside the Guide making sure that the it is on the side of the Guide that has a hole in the bottom. Slide the Pusher down until the latch on the Guide locks it into place.

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Assembly Timing
For the following time charts, Alpha refers to an angle representing symmetry about an axis perpendicular to the axis of insertion. Beta refers to an angle representing symmetry about the axis of insertion. Therefore, an angle of 360 degrees means a component must be oriented in one specific manner, while an angle of 180 degrees means a component must be oriented in one of two allowable manners. The numbers in brackets, in the Handling and Insertion columns, refer to the row and column respectively in the assembly time charts that were used to obtain the various times above. The position in the table is based off of part size and the quantity, Alpha + Beta. Pre-Assembly Process
Table 5: Pre-Assembly Process

Step 15

Alpha 0

Beta 0

Alpha + Beta 0
Handling Time (sec) 1.13 (0,0) 1.5 (1,0) 1.13 (0,0) 1.5 (1,0) 1.13 (0,0) 1.5 (1,0) 1.13 (0,0) 1.13 (0,0) 1.13 (0,0) 1.13 (0,0) 1.95 (3,0) 1.13 (0,0) 1.95 (3,0) 1.95 (3,0) 1.13 (0,0)
Insertion Time (sec) (9,7) (3,1) 12 (9,7) (9,7) 5.5 (0,6) (9,7) 0
The pre-assembly process takes a total time of 79.02 sec.

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Manufacturing Timing
Table 6: Manufacturing Timing

Step 41

Alpha 360

Alpha + Beta 360

Handling Time (sec) 1.95 (3,0) 2.36 (2,3) 1.5 (1,0) 2.25 (1,2) 1.5 (1,0) 1.5 (1,0) 1.13 (0,0) 2.36 (2,3) 1.5 (1,0) 2.25 (1,2) 1.5 (1,0) 1.5 (1,0) 1.13 (0,0) 2.36 (2,3) 1.69 (0,3) 1.95 (3,0) 1.8 (1,1) 1.5 (1,0) 1.5 (1,0) 1.3 (0,0) 1.95 (3,0) 1.8 (1,1) 1.8 (1,1) 1.5 (1,0) 1.5 (1,0) 1.5 (1,0) 1.13 (0,0) 1.5 (1,0) 1.5 (1,0) 1.5 (1,0) 1.5 (1,0) 1.5 (1,0) 1.5 (1,0) 1.95 (3,0) 2.25 (1,5) 2.25 (1,5) 1.95 (3,0) 1.8 (2,0) 1.8 (1,1) 1.5 (1,0) 1.8 (1,1)
Insertion Time (sec) 0 5.5 (0,6) 5.5 (0,6) 6.5 (0,8) (9,1) 0 5.5 (0,6) 5.5 (0,6) 6.5 (0,8) (9,1) 0 5.5 (0,6) 2 (3,0) 5.5 (0,6) 1.5 (0,0) (3,8) 0 1.5 (0,0) 1.5 (0,0) 1.5 (0,0) (3,8) 6 (3,8) 0 1.5 1.5 (0,0) 1.5 (0,0) 1.5 (0,0) 1.5 (0,0) 1.5 (0,0) 0 1.5 (0,0) 2.5 (0,1) (3,1) 4 (9,0) 6 (3,8) 4 (9,0)

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1.5 (1,0) 1.95 (3,0) 1.95 (3,0) 1.95 (3,0) 1.95 (3,0) 1.13 (0,0) 1.8 (1,1) 1.5 (1,0) 1.5 (1,0) 1.8 (1,1) 1.13 (0,0) 1.5 (1,0) 1.8 (1,1) 1.13 (0,0) 1.5 (1,0) 1.8 (1,1) 1.13 (0,0) 1.5 (1,0) 1.13 (0,0) 1.5 (1,0) 1.5 (1,0) 1.95 (3,0) 1.13 (0,0)
6 (3,8) (3,4) 9 (5,3) 10.5 (2,8) 0 1.5 (0,0) (3,8) 1.5 (0,0) (3,8) 1.5 (0,0) (3,8) 1.5 (0,0) (3,8) 12 (9,7) 5 (3,1) 0
The manufacturing assembly process takes a total time of 302.24 sec. Customer Assembly
Table 7: Customer Assembly

Step 5 6

Alpha 360 360

Beta 360 360

Alpha + Beta 720 720
Handling Time (sec) 1.95 (3,0) 1.5 (3,0) 1.5 (1,0) 1.5 (1,0) 1.95 (3,0) 1.95 (3,0)

Insertion Time (sec) 2 (3,0) 4 (1,0) 5 (3,1) 2 (3,0) 1.5 (0,0) 2 (3,0)
The customer assembly process takes a total time of 26.85 sec.

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Assembly Cost
The total time for assembling one part is 434.96 seconds, or 0.1208 hours, which is obtained by adding the pre-assembly time, the manufacturing assembly time, and twice the customer assembly time. The customer assembly time is added twice because the assembler must perform the customer assembly to test that all the parts fit and pass inspection and then disassembly the customer portion to prepare the product for packaging.
The following table shows the hourly compensation cost in U.S. dollars per product assembled based on rates for some selected countries.
Table 8: Hourly compensation cost in U.S. dollars
Country Germany United Kingdom United States Mexico Philippines
Country Wage ($/hr) 48.22 35.81 32.26 4.04 1.68
Assembly Cost ($/product) 5.82 4.33 3.90 0.49 0.20

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Pro and Cons
The National Presto Industries, Inc gave a high-quality product with the production of their salad shooter for the price. The overall user assembly is uncomplicated and allows someone to take it out of the box and use the machine right away. The functions of the shooter are straight forward and the only disassembly and assembly for the user is the changing of the four different Cutters that are interchangeable within 30 seconds. The Funnel Guide that moves in and out of the Chamber has tabs at the top, so that it does not get wedged into the Chamber that allows for easy removal. There is only one speed on the handle that allows the user to turn it on and off with a safety mechanism incorporated. The motor will not run unless the tab on Chamber is locked into place and the contacts are pushed closed by the tab. The shiny sleek material used to make the shooter, flow together and give the customer a product that fits in and matches with other kitchen appliances. This smooth but sleek material allows for easy cleanup with minimal effort for the user. The materials used to construct each part were chosen with thought and were correct to the application. The material needed to be excellent around a wet environment and have good fatigue life and strength for constant use. The moving parts such as the On-Off Switch assembly, Chamber, and cone assembly were made from materials with good fatigue life and strength. The housing material was structured in a way that gave it good durability and strength to deal with the constant torque of the Motor. Presto could have made some simple changes to the design to make it more user friendly and also fix some of the safety concerns in the process. The smooth sleek surface of the housing has some extra crevices that could be remodeled to make the cleaning process even easier. The air vents on the housing for the fan only go a third of the way down, but there are crevices that go the whole way, which are unnecessary. The fan on the Motor could be more efficient if it were a push or pull fan instead of flat blades just pushing the air in all directions. Another simple fix that could improve the assembly time, by at least five seconds, is tapering the holes on the housing so the screws slide right in to be tightened. Finally, there is a bad choice of gear profile for the outside teeth of the plastic gears have a profile that is not commonly used in gears. Most gear teeth profiles when designed follow an involute gear profile. This profile looks like the involute of a circle (View figure 1). This profile has a couple of advantages. One is that the gears roll off each other instead of sliding so there is no loss of power due to friction. The second advantage is that the gears move at a constant rate with respect to each other. 80 | P a g e

NOMINAL DIM. 62.80 mm 62.95 mm
ACTUAL TOLERANCE 0.07 mm 0.07 mm

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Chamber - Front Housing (Dimple Lock Feature) The dimple feture of the Chamber must contact the Front Housing with an interference fit for the maximum material condition for the first feature of the Chamber and the least material condition of the second feature of the Chamber and for the Front Housing.

LFH LC1

PART Chamber Chamber Front Housing

LABEL LC1 LC2 LFH

NOMINAL DIM. 16.71 mm 2.50 mm 14.74 mm
PROCESS Injection Molding Injection Molding Injection Molding
PROCESS TOLERANCE 0.008 mm/mm 0.008 mm/mm 0.008 mm/mm
ACTUAL TOLERANCE 0.14 mm 0.02 mm 0.12 mm

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Chamber - Twist-Lock (Top Lock Feature) The large feature on the outside rim of the Twist-Lock must contact the Chamber with an interference fit for the maximum material condition for the first features of the Chamber and Twist-Lock and the least material condition of the second features of the Chamber and Twist-Lock.

LT2 LT1

PART Chamber Chamber Twist-Lock Twist-Lock

LABEL LC1 LC2 LT1 LT2

NOMINAL DIM. 7.31 mm 0.90 mm 0.02 mm 7.40 mm
PROCESS Injection Molding Injection Molding Injection Molding Injection Molding
PROCESS TOLERANCE 0.008 mm/mm 0.008 mm/mm 0.008 mm/mm 0.008 mm/mm
ACTUAL TOLERANCE 0.06 mm 0.01 mm 0.01 mm 0.06 mm

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Chamber - Twist-Lock (Concentric Circle Fit) The rim of the Chamber must fit within the opening of the Twist-Lock with a clearance gap for the maximum material condition of the Chamber and the least material condition of the Twist-Lock.

LT C2 LC C1

PART Chamber Twist-Lock

LABEL LC LT

NOMINAL DIM. 3.41 mm 4.35 mm
ACTUAL TOLERANCE 0.03 mm 0.04 mm

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Pusher Guide (Clearance Fit) A clearance fit between the Pusher and the Guide is needed to allow for the Pusher to be easily inserted and removed. The clearance between the two must not exceed the width of the tab to allow it to always secure the Pusher.

Front Hounsing - Back Housing (Clearence Fit) The lip feature of the Front Housing must fit within the lip feature of the Back Housing with a clearance gap for the maximum material condition of the Front Housingand the least material condition of the Back Housing.
PART Front Housing Back Housing

LABEL LF LB

NOMINAL DIM. 2.70 mm 3.28 mm

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Front Hounsing - Back Housing (Clearence Fit) The lip feature of the Back Housing must fit within the lip feature of the Front Housing with a clearance gap for the maximum material condition of the LF and LB1and the least material condition of the LB2.

LF C LB1

PART Front Housing Back Housing Back Housing

LABEL LF LB1 LB2

NOMINAL DIM. 1.00 mm 1.00 mm 2.30 mm
ACTUAL TOLERANCE 0.01 mm 0.01 mm 0.02 mm

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Front Hounsing - Large Gear - Back Housing The assembly of the Front Housing, Large Gear, Small Gear, Gear Support, and Back Housing must must have a very slight interference in order to keep the gears seated and restirct motion within the housing assembly. This interfernece must be very slight in order to keep friction and cocking minimal.

LSG LGS LB1

PART Front Housing Large Gear Small Gear Support Back Housing Back Housing
LABEL LF LLG LSG LGS LB1 LB2
NOMINAL DIM. 9.50 mm 10.07 mm 7.60 mm 1.10 mm 3.89 mm 31.80 mm
PROCESS Injection Molding Injection Molding Injection Molding Injection Molding Injection Molding Injection Molding
PROCESS TOLERANCE 0.008 mm/mm 0.008 mm/mm 0.008 mm/mm 0.008 mm/mm 0.008 mm/mm 0.008 mm/mm
ACTUAL TOLERANCE 0.08 mm 0.08 mm 0.06 mm 0.01 mm 0.03 mm 0.25 mm

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Cutter - Large Gear (Hexagonal Fit) The hexagonal Cutter shaft must fit within the hexagonal Large Gear hole with a clearance gap for the maximum material condition of the Cutter and the least material condition of the Large Gear.

PART Cutter Large Gear

LABEL LC LLG
NOMINAL DIM. 12.96 mm 13.25 mm
ACTUAL TOLERANCE 0.11 mm 0.11 mm

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Cutter - Large Gear (Hexagonal Fit) The hexagonal Cutter shaft must fit within the hexagonal Large Gear hole but not be able to turn for the least material condition of the Cutter and the maximum material condition of the Large Gear.
NOMINAL DIM. 14.96 mm 13.25 mm
ACTUAL TOLERANCE 0.12 mm 0.11 mm

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Cutter - Twist Lock (Diametric Fit) The front end of the Cutter body must fit within the inner diameter of the Twist Lock for the maximum material condition of the Cutter and the least material condition of the Large Gear.

PART Cutter Twist Lock

LABEL DC DTL
NOMINAL DIM. 84.12 mm 85.70 mm
ACTUAL TOLERANCE 0.68 mm 0.69 mm

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Cutter - Twist Lock (Diametric Fit) The front lip of the Cutter body must stay within the the inner diameter of the Twist Lock for the least material condition of the Cutter and the maximum material condition of the Twist Lock.
NOMINAL DIM. 88.44 mm 85.70 mm
ACTUAL TOLERANCE 0.71 mm 0.69 mm

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Cutter - Chamber (Diametric Fit) The front lip of the Cutter body must fit within the opening in the front of the Chamber for the maximum material condition of the Cutter and the least material condition of the Chamber.

PART Cutter Chamber

LABEL DC DCH
NOMINAL DIM. 88.44 mm 92.35 mm
ACTUAL TOLERANCE 0.71 mm 0.74 mm

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Cutter - Chamber (Diametric Fit) The back lip of the Cutter body must fit within the cylindrical section in the back of the Chamber for the maximum material condition of the Cutter and the least material condition of the Chamber.
NOMINAL DIM. 54.90 mm 55.86 mm
ACTUAL TOLERANCE 0.44 mm 0.45 mm

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Cutter - Chamber (Length Fit) The length of the Cutter body, from front to back lip, must fit within the conical canivity in the Chamber for the maximum material condition of the Cutter and the least material condition of the Chamber. LCH LC

LABEL LC LCH

NOMINAL DIM. 96.75 mm 98.60 mm
ACTUAL TOLERANCE 0.78 mm 0.79 mm

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Funnel Guide Twist Lock (Interference Fit) An interference fit is needed between the Funnel Guide and the Twist Lock in order for the Funnel Guide to remain in position.