Pneumatic stepper motor: R-90 Bourke engine
thingiverse
Printed in PLA, this motor can deliver up to 1.6 Nm (yes, 1.6 Newton meter or 160 Ncm) at 4 bar pressure. Forget all those other designs that can barely lift a few grams, the real work begins here. See video how it lifts 5+ kg using a 60mm diameter spindle without a gearbox. The mechanical design is identical to that of the Bourke engine developed in the 1920s, with one difference: pressurized air is used instead of fuel combustion. This engine acts as a rotational stepper motor with a step size of 90 degrees, requiring two 5/2-way valves (or equivalent) for control. Video instructions for assembly are available at https://www.youtube.com/watch?v=I9DUlbN97yk. Get started making this project and feel free to ask for help if needed. Renamed to "R-81 Bourke Engine" on July 8, 2019. Renamed again to "R-90 Bourke Engine" on October 9, 2019.
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