Power Scissors 2 - The Better Power Scissors
The Powered Scissors are designed to cut dozens of materials in the workshop and around the house in an easy fashion. The scissors contain a battery that is charged by plugging the power cord into an outlet. A trigger is pulled to activate the motor inside the scissors. The motor rotates the input linkage. The Scotch Yoke translates the motor's rotational movement into translational movement. This translational movement is used to move one of the scissor blades back and forth which provides the cutting force. The other scissor blade is held stationary in the scissor housing. A spring, which holds both blades in place, is also in the housing.
Cuts a Variety of Materials - Can cut wrapping paper, plastic, fabric, cardboard and paper.
Cordless Power - Fast and easy cutting without limitation of a power cord.
Long Lasting Battery - 70 minutes of continuous use. A long lasting battery makes it a practical tool.
Durable - Strong tool that will last for a long time.
Lightweight - Scissors are easier to handle with lighter weight
Dull Edges - In case of an accident, the edges are dull so it doesn't hurt customers.
Low vibration - It would be uncomfortable for the user to hold scissors if they had high vibration.
Comfortable Grip - User comfort, especially for long use.
Small in Size - Easy to store and easy to handle.
Attractive Color - Black and red are typical colors for this type of tool.
|Number||Customer Requirements||Engineering Specifications|
|1||Battery Life||Hours of use (h)|
|2||Strong Cutting Blade||Force produced by blade (N)|
|3||Blade that retains sharpness||Rockwell hardness|
|4||Lack of vibration (Dampening)||Weight required to dampen vibration (g)|
|5||Material Removal Rate||Cutting speed (rpm)|
|6||Reasonable Size||Volume (cm^3)|
|7||Ergonomic Grip||Diameter of handle (cm)|
|8||Light Weight (Easy to hold)||Weight (g)|
The table belows lists the components for the Black and Decker Power Scissors:
|Part #||Part Name||Category||Function||Material||Picture|
|1||Scissor Blades||Output||Shears material||Aluminum *|
|2||Scotch Yoke||Motion Coversion||Converts motion from rotation to translation||Plastic|
|3||Scissor Housing and Spring||Structural Component||Provides support to blades. Holds them together tightly.||Plastic and Aluminum|
|4||Input Linkage||Motion Coversion\Transmission||Also converts motion from rotation to translation.||Aluminum|
|5||Electric Motor||Transmission||Takes energy from battery and drives rotating shaft.||Copper, Alumnium, Plastic|
|6||Power Source - Battery||Input||Provides energy for electric motor operation.||Nickel Cadmium/Lithium Ion|
|7||External Housing||Structural Component||Holds all parts in place and creates a easy surface to grip||Plastic/Rubber|
|8||Plastic Trigger/Spring||Input||Provides a way for user to easily turn the device on or off.||Plastic/Aluminum|
|9||Trigger Switch||Input||Allows battery power to flow to the electric motor.||Plastic/Aluminum|
|10||Power Switch||Input||Turns the device on or off. Disables trigger switch when off.||Plastic/Aluminum|
|12||Power Input/Charger||Input||Provides method to charge internal battery||Plastic/Aluminum|| |
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|13||Wires/Resistor||Other||Allows for passage of energy through switches, battery, and motor.||Plastic/Copper|
|13||Power Supply/Charger||Input||Charges internal battery.||Plastic/Copper|
|What are the critical features and dimensions?||
|What kind of loading do we expect to be on the component?||
|What measures can we use to evaluate performance?||
Rendered Scotch Yoke
Automatic Can Crusher
Problem Statement and Concept
Our project for the semester consists of creating an automated can crushing machine. The purpose of the machine would be to easily load and crush a standard size alumnium beverage can. If possible we would like to be able to load and crush multiple cans in succession.
In order to automate this process many machine elements will be included:
- Electric Motor
- Quick Return Mechanism
- Gearing\gear reductions
- Mechanical advantage parts