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Acme Tap
- Thread starter minugs
- Start date
- Joined
- Dec 6, 2012
- Messages
- 2,677
Ebay shows Acme 3/4x6:
http://www.ebay.com/itm/FRESHLY-SHA...382290?hash=item51e753d692:g:370AAOSwOVpXdsSX
currently at $9.95
and
http://www.ebay.com/itm/1-new-WIDEL...833362?hash=item28137fc892:g:6MUAAOSwyjBW3f0C
$49.99 / make offer.
Perhaps more than you want to spend for a one time job.
But, as George Wilson identified above. These things can be broken easily.
I'm guessing you can't chuck whatever it is in a lathe.
Daryl
MN
http://www.ebay.com/itm/FRESHLY-SHA...382290?hash=item51e753d692:g:370AAOSwOVpXdsSX
currently at $9.95
and
http://www.ebay.com/itm/1-new-WIDEL...833362?hash=item28137fc892:g:6MUAAOSwyjBW3f0C
$49.99 / make offer.
Perhaps more than you want to spend for a one time job.
But, as George Wilson identified above. These things can be broken easily.
I'm guessing you can't chuck whatever it is in a lathe.
Daryl
MN
- Joined
- Apr 9, 2012
- Messages
- 45
Good for you.
I had to do LH acme threads for a cross slide nut and decided to cut the threaded rod and make a tap (was 5/8 x 10). Even on acetal they wouldn't work. I then ground a bit and used it to do the rough threads on the lathe. After that, I used the home made taps and they did the job. For the "real thing", I used the same approach, but used a borrowed tap. The material was 350 brass and harder to cut than acetal. Worked fine. I tried using the borrowed tap without doing the internal cuts first, and found that it was much too difficult to turn the tap Making the rough cut on the lathe with a boring bar and a home ground bit proved to be the answer. Had those approaches not worked, I'd have gotten some nuts and used those instead.
The original nuts were either of cast iron or "grey metal" (whatever that is). Hard, so it cracked. Didn't want to have to do the job again, and didn't want to work with cast iron, so I used acetal for practice and brass for the final. I'm sure the acetal would have been fine, at least for a while.
I had to do LH acme threads for a cross slide nut and decided to cut the threaded rod and make a tap (was 5/8 x 10). Even on acetal they wouldn't work. I then ground a bit and used it to do the rough threads on the lathe. After that, I used the home made taps and they did the job. For the "real thing", I used the same approach, but used a borrowed tap. The material was 350 brass and harder to cut than acetal. Worked fine. I tried using the borrowed tap without doing the internal cuts first, and found that it was much too difficult to turn the tap Making the rough cut on the lathe with a boring bar and a home ground bit proved to be the answer. Had those approaches not worked, I'd have gotten some nuts and used those instead.
The original nuts were either of cast iron or "grey metal" (whatever that is). Hard, so it cracked. Didn't want to have to do the job again, and didn't want to work with cast iron, so I used acetal for practice and brass for the final. I'm sure the acetal would have been fine, at least for a while.