R-90 Pneumatic stepper motor: Bourke engine
myminifactory
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 hardly lift a few grams - the real work starts here. See video how it lifts 5+ kg using a 60mm diameter spindle without a gearbox. The mechanical design is more or less identical to that of the Bourke engine, developed in the 1920s. The only difference lies in the gas: pressurized air is used instead of fuel combustion. This engine functions as a rotational stepper motor with a step size of 90 degrees, requiring two 5/2-way valves (or equivalent) for control. Video with assembly instructions can be found at https://www.youtube.com/watch?v=I9DUlbN97yk. Enjoy making this project and feel free to ask for help if you need it! July 8, 2019: The design has been renamed to "R-81 Bourke Engine". Refer to the PDF for further instructions.
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