28 Apr '16, 8am

Threadless Ballscrew for 3D Printer

Threadless Ballscrew for 3D Printer

[2n2r5] posted up a mechanism that we’d never seen before — a threadless ballscrew that turns rotational into linear motion with no backlash. It works by pressing the edge of three bearings fairly hard up against a smooth rod, at an angle. The bearings actually squeeze the rod a little bit, making a temporary indentation in the surface that works just like a screw thread would. As the bearings roll on, the rod bounces back to its original shape. Watch it in action in the video below. The two benefits of these pseudo-threads is that they fit tightly so there’s no backlash, and they give when too much force is applied, rather than jamming. Eliminating backlash is awesome for a 3D printer, but it’s not obvious how a thread that gives under excessive load is a plus, unless you’ve crashed your printhead into the bed of the printer. Generally speaking, 3D printers don’t subject ...

Full article: http://hackaday.com/2016/04/28/threadless-ballscrew-for-3...

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