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Member postings for Alan Campbell 1

Here is a list of all the postings Alan Campbell 1 has made in our forums. Click on a thread name to jump to the thread.

Thread: Zero backlash?
02/06/2018 14:07:20

If you need adjustable backlash, as is likely in some applications, you can best do that by using two normal ball nuts, and you rotate them one against the other until you get the desired result. I have seen some people advocate shimming, but that is rather pointless as using the properties of a screw thread gives you infinite resolution of the adjustment. It is cheaper using two standard nuts than having one preloaded at the factory to your requirements.

In my case, way back in 1978, the nuts each had an external keway. We fitted one on each side of the moving item. with a simple flange bolted to each side, at least one flange having curved slots to allow angular adjustment. When rotated gently the nuts clamped themselves against the accurately machined and slightly counterbored (for centering) faces of the moving part, and it was easily possible to feel for the change between backlash and friction.

I got well under a tenth of a thou backlash and negligible friction on a 2mm pitch ground thread.

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