1. Home
  2. ⏣ General Metalworking
  3. Tips for Lufkin #1671A automatic center punch?

Tips for Lufkin #1671A automatic center punch?

Been looking a this thing sitting on my desk for months, meaning to see if I can find tips for it. Lufkin of course being long out of business, means trying to find something current and compatible.

My best guess is the thread is a 3-56. Tap drill for that is .082, I can get a .085 pin in, barely. 3-48 is .078 and that's way loose. Also, I can thread a 2-56 tap clear to bottom and never feel any binding from dissimilar pitch. I have a 3-48 roll tap, and it wants to start, but binds almost at once.

So, MSC lists replacement points for Starrett models 818, 18A/18AA, and

18B; General #78, 79, and one for "Made in USA".

Anyone happen to know, or can verify, if any of these have a 3-56 thread for the replaceable tip?

Thanks,

Jon

Reply to
Jon Anderson
Loading thread data ...

I have a General #79 here, and the tip has a 3-56 thread. I also have a Starrett 18-A, and though the tip doesn't unscrew easily, it appears outwardly identical to the General. That's because when I broke the General's tip I think I replaced it with a Starrett tip.

Reply to
Ned Simmons

Hey Thanks! I didn't want to order one of each and find (my luck) that none of them worked... Did you order an 18A tip for the General? I'd rather have a Starrett tip, but the General tip would work tons better than no tip at all!

Jon

Reply to
Jon Anderson

I don't remember exactly, but I probably ordered what was available from McMaster or MSC with the hopes it would fit. I didn' t have the Starrett punch at the time, so couldn't have checked to see if they were interchangeable.

Reply to
Ned Simmons

PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.