Can Opener

From GICL Wiki
Revision as of 23:09, 4 February 2008 by AdamLantz (Talk | contribs)

Jump to: navigation, search



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

  • plug outlet
  • magnet holds standard size canned product
  • fits standard cans
  • blade cuts through standard can lid
  • small enough to fit on kitchen counter
  • 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 consumed (W)
  • maximum force exerted on magnet without failure (lbs)
  • allowable can height and width (in)
  • maximum thickness of lip on lid (in)
  • force need to puncture can lid (lbs)
  • volume (in^3)
  • time it takes to cut standard lid (sec)
  • motor lifetime (yrs)
  • time it takes for blade to dull (yrs)
  • corrosion value (#)
  • force required to push lever arm (lbs)
  • percentage of customers who like appearance (%)
  • number of colors available (#)


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 Module


  • type of material
  • 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 between geared wheel and can
  • friction between gear shaft and 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