The clutch must couple and disengage the motor shaft and flywheel shaft at 250 rpm. It must use the specified 19:1 DC gear motor and be fabricated using the 3D printers with available frictional materials like sandpaper and rubber. The clutch design must not exceed $15, fit in a 410 in^3 box, and be assemblable in 20 minutes. The springs must withstand 3 lbs of force with a spring constant over 18 lb/in and not allow the stall torque to shear pad guides. The coefficient of friction of materials like sandpaper must be over 1. A proposed design costs $13.83 total.

1. Project 2
GROUP 8

2. Design Requirements
 The clutch must couple the output shaft of the motor to the flywheel shaft
 The clutch must disengage at 250 rpm
 The motor to be used is the 19:1 DC gear motor at the following page o
https://www.pololu.com/product/1442
 The clutch must be fabricated using the 3D printers
 Frictional materials are limited to those that are reasonably available (sandpaper,
rubber)
 Bill of Merchandise must not exceed $15
 Must be able to be assembled in 20 minutes
 Must fit inside of a 410 in^3 box to be printed.

3. Derived Design Requirements
 The springs must be able to withstand a force of 3 lbs
 Spring constant must not be less than 18 lb/in
 Stall torque should not shear pad guides
 The coefficient of friction should be greater than 1 for sandpaper

4. Timeline

6. Design

14. Cost
 Extension spring: $3.04 (X2)
 Plus tax: $6.58
 Sandpaper: $6.31
 Plus tax: $6.83
 TOTAL: $13.83