uk acme thread suppler

[Taris JewellParticipant @tarisjewell61133]

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

[Taris JewellParticipant @tarisjewell61133]

[HopperParticipant @hopper]

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

[Nigel Graham 2Participant @nigelgraham2]

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.

[StueeeeParticipant @stueeee]

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

[Dave HalfordParticipant @davehalford22513]

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

[HopperParticipant @hopper]

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.

[Dave HalfordParticipant @davehalford22513]

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

[Nigel Graham 2Participant @nigelgraham2]

Try this one:

http://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.

[old martParticipant @oldmart]

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.

[Nigel Graham 2Participant @nigelgraham2]

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

You don't need import it!.

[Nigel Graham 2Participant @nigelgraham2]

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?

[Taris JewellParticipant @tarisjewell61133]

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

[WearyParticipant @weary]

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

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Hopper on 28/04/2022 11:09:14:

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.

.

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

MichaelG.

[Michael GilliganParticipant @michaelgilligan61133]

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.

[Taris JewellParticipant @tarisjewell61133]

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

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Taris Jewell on 29/04/2022 22:27:11:

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

.

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

… I wonder how much Helix charge

MichaelG.

[HopperParticipant @hopper]

Posted by Michael Gilligan on 29/04/2022 21:19:51:

Posted by Hopper on 28/04/2022 11:09:14:

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.

.

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

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.

[HopperParticipant @hopper]

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

[Kiwi BlokeParticipant @kiwibloke62605]

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**

[HopperParticipant @hopper]

Posted by Dave Halford on 28/04/2022 14:30:01:

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

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

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Hopper on 29/04/2022 23:56:24:

Posted by Michael Gilligan on 29/04/2022 21:19:51:

Posted by Hopper on 28/04/2022 11:09:14:

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.

.

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

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 […]

.

Yes, I think we are in agreement there … and I have emboldened a few words in the hope of clarifying that

I do have an ‘purist’ preference for the use of 127 … as, of course, did Martin Cleeve

its inclusion brings simplicity and convenience [if you can make space to fit it]

MichaelG.

.

Edit: __ See the images of his lathe that I have previously posted in tribute:

https://www.model-engineer.co.uk/forums/postings.asp?th=104724

Edited By Michael Gilligan on 30/04/2022 06:40:13

[HopperParticipant @hopper]

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. )

.

[Michael GilliganParticipant @michaelgilligan61133]

Then let’s skip the clarification and just repeat my main response:

Yes, I think we are in agreement there …

MichaelG.

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