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Anti backlash housing for 1/2 inch thread

by lach11, published

Anti backlash housing for 1/2 inch thread by lach11 Jan 14, 2013
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I am in the midst (a slow midst) of building a CNC mill and my frugal side didn't want to fork out the cash for proper anti backlash threads/nuts. My local Bunnings store sold relatively cheap 1/2" threads and so I designed this as a cheap alternative makeshift anti backlash system. It fits quite snugly and seems to remove all the play but is not yet tested. It uses two nuts and a spring I managed to remove from an old office printer. The .skp is uploaded for modifying.


Print two - one for each side. Other requirements include the 1/2" thread with two 1/2" nuts to suit which I purchased from Bunnings [for the Aussies] (See .skp file for exact dimensions). The spring I removed from an office printer that was no longer working - was around 16mm OD. I am stilling playing around with the spring length but suffice to say, having it too long creates a bit too much tension. And lastly you will need some fixings for mounting.

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I found that for the nuts I had, I needed to lengthen the cavities for the nuts to allow them to move. the current design kept them in place so it would not work.