Power Scissors

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Power Scissors Dissection


The primary function of the Power Scissors is to cut through different materials. There are two blades, the bottom one stays stationary, and the top blade moves rapidly, opening and closing. This action allows the tool to cut through different materials.


The table belows lists the components for the Black & Decker Power Scissors.

Table 1: Power Scissors Component List
Part # Part Name Category Function Material Picture
1 Motor Input Serves as Power Supply for blades
2 External Casing Structural Component Protects internal components and holds them together Plastic
Complete open.JPG
3 Jaws Ouput The bottom blade remains stationary, while the top blade moves continually up and down Steel
4 Battery Input Provide power to motor Wrapped in cardboard
5 Cam Motion Conversion This forces the bracket to move by translating rotation motion of the motor, to translational movement in the bracket. The bracket then causes the upper blade to open and close Plastic
6 Screws Structural Holds Casing Together Metal
7 Bracket Support element Ball and socket joint limits movement of jaws. The socket is ovular so it allows some movement of the jaws. Plastic
8 Button (spring) Motion Conversion Closes switch to start motor by closing circuit. Button – plastic

Spring – metal Switch - metal

Customer Requirements

  • Blades are sharp enough to cut different materials (1)
    • Have a sharpening function
    • Changeable blades for different materials to cut
  • Easy to use (2)
    • Has a low weight
    • Has a small size
    • comfortable to hold
    • Wireless
    • Easily accessible buttom to start
  • Aestheically Pleasing (3)
    • More likely to be bought
  • Long battery life, chargeable (4)
  • Doesn’t break if dropped (5)

Engineering Specifications

  • Material for jaws is sharper than the intended material to cut
    • Corresponds to blade sharpness (1)
  • Batteries last for 4 hours of continuous use
    • Corresponds to long battery life (4)
  • Force of scissors is greater than 5N
    • Corresponds to ability to cut through material (1)
  • Weight is less than 5 lbs
    • Corresponds to easy to use (2)
  • Scissors retain sharpness for 40 hours of use
    • Corresponds to blade sharpness (1)
  • Torque on motor is great
    • Corresponds to ability to cut through material (1)
  • External casing can withstand force from being dropped
    • Corresponds to long-lasting (5)
  • 90% of people surveyed found the scissors pleasing
    • Corresponds to Aesthetically pleasing. (3)