Can Opener

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This can opener is manufactured by Durabrand. The primary function of the can opener is to open cans by cutting the metal lid off. An electrical motor spins the geared wheel, which in turn spins the can. The blade remains stationary as it cuts the lid off.

User Requirements

  • has plug outlet
  • magnet holds standard size canned product
  • blade cuts through standard can lid
  • small enough to fit on kitchen counter
  • no loud noise
  • cuts lid quickly
  • long lifetime
  • non-corrosive blade and geared wheel
  • easy to use
  • small force required to push lever arm
  • aesthetically pleasing

Engineering Specifications

  • power output
  • can diameter
  • can height and weight


The table belows lists the Bill of Materials for the Durabrand Can Opener:

Table 1: Durabrand Can Opener Bill of Materials
Part # Part Name Category Function Material Picture
1 Casing Structural component Holds, protects, and supports internal and external components ABS plastic
2 Guide bar Support element Guides lever arm and can Metal
3 Magnet Support element Holds can lid Ceramics
4 Geared wheel Output Rotates can Metal
5 Cutting blade Output Cuts though can lid Metal
6 Lever arm Structural component Holds blade and magnet; on/off switch Plastic
7 Motor Input Rotates the geared wheel Metal plate, coil
8 Medium gear Output Converts the electrical energy into the horizontal mechanical energy Metal, plastic, and ball bearings
9 Large gear Transmission Reduces speed of rotation and provides more torque; connects to geared wheel Inner gear - metal; outer gear - plastic
10 Switch Power supply Completes circuit; on/off switch Copper with plastic plate (nonconductor)
11 Power cord Power supply Supplies power to motor Wires and insulation with a metal connection
Canpower cord.jpg

Large Gear and Geared Wheel

  • Decisions: type of material, high gear ratio to reduce angular velocity
  • Critical features: radius, gear tooth size, life expectancy
  • Expected loading: weight of can
  • Measures to evaluate performance: force exerted on geared wheel, friction of geared wheel to can, friction of gear shaft to support structure
Figure 1: Large Gear and Geared Wheel Module

Medium Gear

  • Decisions: type of material, high gear ratio to reduce angular velocity
  • Critical features: radius, tooth size, life expectancy
  • Expected loading: stress
  • Measures to evaluate performance: stress, friction of gears, friction of shaft

Motor and Shaft

  • Decision: size, power requirement
  • Critical features: power output, electrical connection
  • Expected loading: resistance of friction and weight of can
  • Measures to evaluate performances: torque, speed, lifetime