Latest revision as of 12:01, 20 February 2008

Ben Bouffard

Andrew Greulich

Chris Jones

• • • Return to Bucknell Mechanical Design page.

Primary Function

The primary function of the hand mixer is to mix food (eggs, cake, etc.) by using a small motor to rotate two beaters.

User requirements:

• Mixes foods
• Is handheld and ergonomic
• Visually Appealing
• Does not Jam with food
• Durability
• Detachable beaters

Engineering specifications:

• Maximum mass (grams)
• Minimum mixer angular speed (radians/second)
• Variable speed (number of speeds)
• Minimum size of opening against beaters (mm)
• High gear reduction ratio

A picture of the mixer before dissection

Customer Reviews

[[1]] [[2]] [[3]] [[4]]

Parts

The table below contains the Bill of Materials for the Durabrand Hand Mixer:

Table 1: Durabrand Mixer Bill of Materials

Part #	Part Name	Category	Function	Material	Picture
1	External Switch	Input	Turns on and changes the speed of the mixer	ABS plastic
2	Eject button	Input	Ejects the beaters	ABS plastic
3	Ejector springs	Other	Returns button back to unpressed position	Metal
4	Case	Structural	Seperates inner parts from user and provides an ergonomic handle	ABS plastic
5	Switch	Input	Allows different amounts of current to enter the motor	copper and plastic
6	Magnet	Transmission	Creates a magnetic flux to make the current carrying copper wire in the motor rotate	ABS plastic
7	Fan	Other	Cools motor by sending air past it	ABS plastic
8	Motor	Input	Converts electrical energy into mechanical rotation energy	Mostly Copper
9	Worm gear	Transmission	Carries rotational power from motor	Plastic
10	Gears	Transmission	Changes the shaft roatation from the motor into 2 parallel rotations	Metal
11	Power cord	Input	Plugs into wall and provides AC current	Copper and rubber
12	Beaters	Output	Mixes food	Metal
13	Wires	Input	carries current from switch to motor	Copper and rubber
14	Screws	Structural	Holds various pieces together	Metal

Pro Engineer Models

Wormgear

• Decisions Made
  • Number of teeth per length
  • Material
• Critical Features/Dimensions
  • size of teeth
  • diameter
  • length
• Type of Loading
  • Torque
  • Axial
• Measures of Performance
  • Max RPM
  • Max shear stress
  • Max torque transferred

Gear

• Decisions Made
  • Number of teeth/gear reduction ratio
  • Material
• Critical Features/Dimensions
  • size of teeth
  • inner diameter
  • outer diameter
• Type of Loading
  • Torque
  • Stress on teeth
• Measures of Performance
  • Max RPM
  • Max shear stress on inside diameter
  • Max torque transferred

Fan

• Decisions Made
  • Number of fan blades
  • Material
• Critical Features/Dimensions
  • size of fan blades
  • diameter
  • angle of fan blades
  • shape of fan blades
• Type of Loading
  • Torque
• Measures of Performance
  • Max RPM
  • Produced mass flow rate of air