Spring 2017 Prosthetic Arm: Gear Test
The Robot Company | CEO Professor Gary Hill
Blog Post Created by Project Manager | Bianca Esquivel
Project Test Executed by Manufacturing and Design Engineer | Cedric Yannick Mbetga
Table of Contents
Preliminary Information
Test Objective
Purpose: The rotation of the wrist is controlled by the servo, MG996R, which will be located in the lower arm. The 90 degree turn (L2-2-1 requirement) of the wrist is met by applying the appropriate gear ration of 17/11= 1.55.
Two gears are designed:
- Driven gear with 17 teeth
- Driver gear with 11 teeth
To avoid the prosthetic hand wire bundle hanging out from the connection of the hand and the arm, a hole is drawn through the driven gear such that the wire bundle can be placed through it and so the wires are able to reach the PCB in the arm.
Aim: Verify that the the two designed and printed gears will rotate accordingly to the gear ratio and make the 90 degree turn. .
Materials
Solidworks
3D Printer
3mm Blue PLA
Test Set Up
Results
The gears have been printed out and they are able to be used together to be controlled by the servo.
Gears
Conclusion
The gears of the design to rotate the wrist a full 90 degrees are able to work to fulfill the requirements listed above.