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Leadscrew nuts

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Peter Simpson 116/02/2017 19:50:41
65 forum posts

My Tom Senior Light vertical suffers for a 2.5mm backlash on the Y axis, does anybody know who / where I could get a new leadscrew nut manufactured ? I could fit a DRO but would like get the backlash down to more tolerable levels.

John Chapman 516/02/2017 20:10:50
9 forum posts
6 photos

My Tom Senior needed a nut purchased a couple of nuts from Roton in the states PM I might have a spare nut.


Mike Poole16/02/2017 20:22:41
1309 forum posts
38 photos

Is there really 2.5mm of backlash in the nut or is there some other part that is loose like the nut or screw mountings letting things float around a bit?


Peter Simpson 116/02/2017 20:33:28
65 forum posts

Hi Mike,

I'm sure the 2.5mm is in the nut.. I measured 2.5mm in various positions across the full travel of the table. There is only 0.6mm backlash on the X axis.

Andrew Johnston16/02/2017 20:47:46
3783 forum posts
454 photos

It does seem a lot, what is the pitch of the leadscrew? One would have expected the X-axis to wear more than the Y-axis as it normally gets more use.


Peter Simpson 116/02/2017 20:54:56
65 forum posts

Not sure of the pitch I will remove the table tomorrow and do some investigations.

Mike Poole16/02/2017 21:01:29
1309 forum posts
38 photos

What I was thinking Peter is that 2.5mm is likely to be near the pitch of the screw although I am not familiar with that mill. It seems common practice is for the nut to have a boss that fits a hole in the casting and is often retained with a bolt. If this has come loose maybe the nut can float around giving the effect of backlash. The screw must also have a method of axial location so that no motion is lost. If the screw pitch is 1/10" then it would be very close to total failure if the pitch is any finer then the nut would already have failed. The nut being loose or the screw floating in its mounting would give the same effect in all positions. It might be worth a bit of investigation before investing in a new nut.


Chris Evans 616/02/2017 22:25:51
1175 forum posts

Buy a length of lead screw and a suitable nut from one of the many suppliers. Cut to length and turn the ends to suit. Adapt the bought nut to suit your requirements.

I have already done my lathe cross slide and next up will be the Bridgeport mill as it is now running out of adjustment. It will be a fraction of the cost of a genuine spare part.

Peter Simpson 117/02/2017 09:47:14
65 forum posts


I stripped the machine this morning and as you suggested the lead screw nut had worked loose. When refitted and tested the backlash is now a respectable 7 thou.

Many thanks Peter

Andrew Johnston17/02/2017 09:58:06
3783 forum posts
454 photos

The simplest solutions are the best. thumbs up


Mike Poole17/02/2017 13:38:36
1309 forum posts
38 photos

Apart from a bit of time that makes a cheap and simple fix. 7 thou sounds very reasonable, glad it was nothing serious


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