uk acme thread suppler

hi guys I'm after a strange one. my old Colchester master seems to use a left-hand acme thread 3/4 x 10tpi. and I don't really want to try and make that so I didn't know if anyone in the UK sold some.

many thanks for any help

Moore International and others in the current thread on Boxford leadscrews.

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.

Might be worth taking a look at this website: **LINK**

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

ABSSAC UK mentioned in the other thread list them.

Surprisingly they quote a maximum accuracy error of 6 thou per foot for their precision screws. Makes all the arguing over metric thread approximation change gears on forums rather moot then.

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

Try this one:

www.hpcgears.com/n/products/linear_motion/leadscrews/leadscrews.php

It is they I used, but note that "standard range" might not include your specific choice, and having it made probably won't be cheap.

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.

That's exactly what I bought from the HPC catalogue: 3/4 X 8 tpi LH ACME...

You don't need import it!.

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

I've looked it up again:

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?

hi, thanks for all replies I've emailed a few different people and it seems £250 is the best price which is more than I'm willing to pay. I'm interested to know some more about changing the handwheels if anyone can recommend a thread or a supplier of good metric hand wheels then I can use any thread I want. i would probably use a metric trapezoidal lead screw if possible.

now failing that I am planning on making the lead screw myself as I see no reason to why I can't and I should save £200 and learn a new skill

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

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Surely any serious argument is about approximations much worse than that ^^^

MichaelG.

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.

michael it was abssac that quoted me £250 they don't stock them they can just custom make it ill email some more people over the weekend and see

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

… I wonder how much Helix charge

MichaelG.

Martin Cleeve's book Screwcutting on the Lathe lists compound gearing with standard set of change gears to cut metric threads on an 8 tpi leadscrew lathe with errors ranging from 1 in 3000 down to 1 in 8000 and that never seems to be good enough for some model engineers who insist on 127 tooth gears etc. But even 1 in 3000 is only 4 thou per foot. 1 in 8000 is thou and 'arf.

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

It's good to see that Halifax Rack & Screw are still going, and now also have a branch in USA. Don't know whether they will still talk to Joe Public, but they were friendly a couple of decades ago... Good luck.

**LINK**