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Manufacturing Process:

A block of foam core was used as a base to form the structure.

The foam was cut and sanded into the desired shape of the arch and the calf of the prosthetic.

A vacuum bagging process was used to ensure good bonding between the carbon fiber and the foam cores.

These piles add strength and stability to the prosthetic.

Above, the calf and arch are shown before (left) and after (right) milling.

Holes were made for the housing of the motor, shaft, and rubber rod connectors.

In the image at the right, the shaft is also shown.

 

Three pressure sensors were read by the LabVIEW software as on/off switches to determine the actual orientation of the foot. LabVIEW software read the input voltages of the pressure sensors to determine the correct output voltage. Output voltage range of the Arduino circuit board is 0-5V. The circuit shown shifted the range down and amplified it so the output range was between -15V to +15V. The sign convention of the output voltage controls the direction of motion, while the intensity of the voltage controls the power output by the motor.

 

CME 475/480 ◦ Design Project I/IIWinona State University ◦ Winona, MN

Last Update: May 6, 2015