Linear actuators without shafting

3D Printing & Imaging Robotics
Linear actuators without shafting
sarrus linear axis actuator.jpg

A major obstacle standing in the way of total self-replication by rapid prototyping machines, notably RepRap, is that certain of the components, particularly ground shafting (or threaded rod) for the Cartesian robot’s linear actuators, require greater precision than the machines are currently capable of. Thingiverse user fdavies is engaged in a noble effort to design printable linear actuators that require no shafting and are instead based on the hinged Sarrus linkage (Wikipedia). Excelsior!


I am descended from 5,000 generations of tool-using primates. Also, I went to college and stuff. I am a long-time contributor to MAKE magazine and My work has also appeared in ReadyMade, c't – Magazin für Computertechnik, and The Wall Street Journal.

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