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Taris Jewell27/04/2022 20:45:42
22 forum posts

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

Hopper27/04/2022 22:10:12
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7881 forum posts
397 photos

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

Nigel Graham 227/04/2022 23:29:17
3293 forum posts
112 photos

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.

Stueeee28/04/2022 09:11:18
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144 forum posts

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

Dave Halford28/04/2022 10:57:20
2536 forum posts
24 photos

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

Hopper28/04/2022 11:09:14
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7881 forum posts
397 photos

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 Halford28/04/2022 14:30:01
2536 forum posts
24 photos

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

Nigel Graham 228/04/2022 14:51:09
3293 forum posts
112 photos

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.

old mart29/04/2022 19:23:40
4655 forum posts
304 photos

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 229/04/2022 19:31:51
3293 forum posts
112 photos

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 229/04/2022 19:53:22
3293 forum posts
112 photos

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?

Taris Jewell29/04/2022 20:32:44
22 forum posts

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

Weary29/04/2022 20:57:20
421 forum posts
1 photos

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 Gilligan29/04/2022 21:19:51
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23121 forum posts
1360 photos
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.

.

dont know

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

MichaelG.

Michael Gilligan29/04/2022 21:53:13
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23121 forum posts
1360 photos

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 Jewell29/04/2022 22:27:11
22 forum posts

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 Gilligan29/04/2022 22:38:02
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23121 forum posts
1360 photos
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.

Hopper29/04/2022 23:56:24
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7881 forum posts
397 photos
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.

.

dont know

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.

Hopper30/04/2022 00:54:14
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7881 forum posts
397 photos

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 Bloke30/04/2022 01:18:17
912 forum posts
3 photos

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**

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