Casting the rubber component of a prosthetic foot sketch

We used a two component rubber resin of polyurethane type for this prototype. The wedge shaped rubber will provide exponential resistance as the prosthetic foot bends forward. The rubber also packs around the metal hinge pin to reduce shear stress.

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Pouring the two components next to the polyprop sheet mould Alex prepared

Mixing the components in a figure eight motion

Pouring the polyurethane

Removing the sheet mould

The finished prosthetic foot sketch, the principle looks promising

The foot in standing position

The foot forced forward

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