OpenSCAD Roller Pinion Rack Profile
thingiverse
A roller pinion, offering the precision and low backlash of a rack and pinion while maintaining simplicity, is a promising option for linear motion. To create this efficient and quiet mechanism, I'm close to deriving the right profile with help from others. Potential materials include smooth rods and brass tubing from hobby stores as bushings. For further insight, consult these references: http://www.ecnmag.com/articles/2011/07/hardware-corner/roller-pinion-tech/ and http://www.nexengroup.com/nxn/files/pdf/966650s.pdf.
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