Have you tried HPC Gears? I bought from them when I made a new lead-screw for my Myford ML7.

(I fitted a second-hand, early-pattern screw-cutting gearbox that needs the screw cutting short to end just inside the wall of the box. Rather than risk an un-useable machine if I made a complete dog's dinner of things or the gearbox failed, and treating the lathe to a new screw anyway, I have kept the original lead-screw and other parts carefully as spare / reversion parts.

I think HPC is the only imperial leadscrew stockist in the UK

Please put a link on, all I see in the catalogue is metric.

Stueee's link to Kingston engineering shows their data sheet 3, but unfortunately their easily available ACME 10 tpi is only 1/2" not the op's 3/4". The 3/4 x 8 ACME is available in rod and nuts, a possibility if the dial graduations could be changed. There are a great many more suppliers over in the USA, but unless you know somebody living there it can be difficult and expensive to ship things to the UK.

OOOps, I beg your pardon. I misread the notification. You want 10TPI. Not the 8 I needed.

I've looked it up again:

http://www.hpcgears.com/pdf_c33/2.8-2.9.pdf,

and no, the only listed 10TPI thread is 0.5" dia.

So back to Old Mart's question of whether you can change the handwheel dial, perhaps make a graduated ring to fit over the existing one?

I know that you wanted a UK supplier, however, a forum member on MECH sourced an acme screw-thread (albeit different to your requirement) from Roton Products in the US and had very good service from them. So ,maybe worth considering?

Here is Roton Products info' , & Here is the relevant MECH thread.

Kingston Engineering in the UK got a mention as a good supplier in the UK in that MECH thread.  Don't know if you have tried them, so here is their site.

Edited By Weary on 29/04/2022 21:04:38

Actually … that’s rather a disappointing spec. from ABSSAC UK

Go Compare : **LINK**

https://www.helixlinear.com/blog/acme-screws/what-puts-the-precision-in-precision-acme-lead-screws/

MichaelG.

.

That makes Hopper’s quoted spec. all the more disappointing, Taris !

… I wonder how much Helix charge

MichaelG.

And when you think of it, even 6 thou per foot is not much total error. That's plus or minus a quarter of a thou per inch. Pretty good for a mass produced item. You'd have to go to an expensive ground thread to fo much better. 

Edited By Hopper on 30/04/2022 00:55:43

Now that you ask, I can't find it either. Must have got it mixed up with one of the others. Sorry.

Whatever. I am not going to get into nitpicking over highlighted words. It's a casual social forum not a PhD thesis. (Although I hear tell PhD's are thicker on the ground than we would have suspected. )

.