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| Screw Cutting an ACME thread |
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| Stormin:
I had a problem with the nut on the vice that came with my milling machine. Measured up and thought it was 5/8 acme and bought an appropriate tap. Turned out the thread on the screw was 16mm trapezoidal so ended up cutting a new acme screw as well to repair the vice. |
| No1_sonuk:
Oh, and is it multi-start? |
| NickG:
Thanks guys, No1 / Stormin, this is a very old vice that's why I thought 8TPI acme from my measurements and inspection of the thread, think it's just single start. Thanks Stew, that's what I found on the internet too teh 29 deg included angle. I think because it's quite course, and deep it maybe needs quite a bit of side clearance - maybe that's where I'm going wrong. Bernd, yes I could do with a thread gauge like that. I was trying to grind it using the screw but it may be a bit worn. Whatever I did when I tried to grind my tool - it didn't work. Think I may do a couple of practice runs on something soft like nylon. Jason, cheers, I looked for a tap and you can buy it from Tracy tools but £22 each which sort of defeats the point a bit! Having said that, it, if need be and I can't screw cut one, it could put an otherwise good vice back into service and still save me a few quid. Even if I can't get it to work, it'll still be an interesting exercise for me, something new and if it does work - another string to my bow! Thanks for the help. Nick |
| NickG:
No1 - might get that book actually, it's pretty cheap I thought it was going to be a fortune when you mentioned a book! :lol: Cheers |
| Stormin:
--- Quote from: NickG on March 18, 2010, 07:40:53 AM ---Thanks guys, No1 / Stormin, this is a very old vice that's why I thought 8TPI acme from my measurements and inspection of the thread, think it's just single start. Jason, cheers, I looked for a tap and you can buy it from Tracy tools but £22 each which sort of defeats the point a bit! Having said that, it, if need be and I can't screw cut one, it could put an otherwise good vice back into service and still save me a few quid. Nick --- End quote --- Mines a very old vice too but still had an unexpected thread. Acme taps are a little cheaper here: http://www.rdgtools.co.uk/acatalog/ACME_TAPS__RIGHT_HAND_.html It was enough work to cut the external thread never mind the internal for the nut as well. |
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