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Thread: Vice restoration
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20th May 2019, 12:33 PM #1Senior Member
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Vice restoration
Hi all .. I need to reproduce this nut for a vintage vice I am working on.. thread diameter is 7/8" or 22.2 mm.. pitch is just over 4 turns to the inch..
a couple of questions,.. because of the mystery number of turns.. how would you set up your lathe to cut this thread ?
secondly... as it is brass, would it be possible to cast the nut around the screw, using the screw as a mandrel ??
Like all projects, is it going to be worth the effort in the long run..
Ken.
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20th May 2019, 02:28 PM #2Most Valued Member
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I would say it will absolutely be 4 TPI, it'll just be wear making it hard to tell. Is it a square form or ACME? Screw cutting without knowing the exact pitch is impossible.
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20th May 2019, 03:19 PM #3Senior Member
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20th May 2019, 03:39 PM #4Most Valued Member
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I think you have a 4tpi thread where someone has messed up or the machine was totally worn that made it, what brand is the vice? I'd probably just make a new screw and nut, screw cutting that pitch will be hard.
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20th May 2019, 07:20 PM #5Most Valued Member
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20th May 2019, 07:23 PM #6Philomath in training
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Rather than trying to make sense out of the nut, measure the very end of the thread. Usually that will be the least worn bit and give you the best idea.
Casting around the screw is unlikely to work well. A nut that size will single point quite nicely.
Added: just looked at my lathe thread chart. It has 4 1/2 and 4 3/4 listed too - would one of those fit better?
Michael
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20th May 2019, 08:00 PM #7Golden Member
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or count the thread/turn over 2->3", even 4" that will give better accuracy?
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21st May 2019, 11:41 AM #8Senior Member
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21st May 2019, 07:22 PM #9Philomath in training
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Maybe set the screw up in your lathe, set the pitch for 6mm and using a piece of wood or something marked with a square thread profile, see if that 6mm pitch holds all the way along. If you get to the end and the sides of the 'cutter' look to line up (allowing for wear), that might help see whether it is metric.
Michael
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21st May 2019, 07:28 PM #10Most Valued Member
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Put the screw in your lathe and set the feed to 4 tpi and your lowest rpm, set a tool up just as a pointer and then run the lathe in the air so to speak, and see if the pointer follows the thread all the way to the end.
If it does then your first problem is solved.
cheers, shed
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21st May 2019, 07:31 PM #11Most Valued Member
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21st May 2019, 07:36 PM #12Most Valued Member
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I would be very, very surprised if any vice needing a rebuild and sold here was metric. I'd be verging on hat eating territory.
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21st May 2019, 07:43 PM #13Senior Member
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Count the number of threads over a longer distance on the lead screw, say 150 or 6". If it's 6mm pitch you'll count 25 over the 150mm and imperial 1/4" then the count will be 24 over the 6".
Which ever one it is won't be easy. You could always make a tap too.
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