Can Opener

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Contents

Function

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)
  • number of customers who like appearance (#)


Parts

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
Internalcomponents.jpg
2 Guide bar Support element Guides lever arm and can Metal
Canguidebar.JPG
3 Magnet Support element Holds can lid Ceramics
Magnetcloseup.JPG
4 Geared wheel Output Rotates can Metal
Canoutergear.JPG
5 Cutting blade Output Cuts though can lid Metal
Cuttertop.JPG
6 Lever arm Structural component Holds blade and magnet; on/off switch Plastic
Canleverarm.JPG
7 Motor Input Rotates the geared wheel Metal plate, coil
Motorunwrapped.JPG
8 Medium gear Output Converts the electrical energy into the horizontal mechanical energy Metal, plastic, and ball bearings
Middlegearcombo.JPG
9 Large gear Transmission Reduces speed of rotation and provides more torque; connects to geared wheel Inner gear - metal; outer gear - plastic
Cangearlarge.JPG
10 Switch Power supply Completes circuit; on/off switch Copper with plastic plate (nonconductor)
Onoffcontact.JPG
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