Author Topic: Small internal acme/trapezoidal threads?  (Read 730 times)

Offline PekkaNF

  • Hero Member
  • *****
  • Posts: 2462
  • Country: fi
Small internal acme/trapezoidal threads?
« on: November 24, 2019, 06:41:25 AM »
One guy has problem on making an pretty unstardard thread. I can't help on that one:  TR 15 20 TPI.

ACME and trapetzoidal threads are a litle different and well documented. No problem there. Bastard threads are not that incommon.

Problem description: small internal thread is pretty had to make in lathe single point threading.

1: How small trapetzoidal/acme thread is practical to do single pointing? Looks like threading inserts for under 16 mm shanks are not that common.
https://www.shop-apt.co.uk/threading-inserts.html


2: Making unstardard taps seems to be possible, but trapezoidal thread seems to be pretty hard form cutting. Long taper or series tap? Other ideas?

Pekka




Offline WeldingRod

  • Sr. Member
  • ****
  • Posts: 374
Re: Small internal acme/trapezoidal threads?
« Reply #1 on: November 24, 2019, 04:11:14 PM »
How strong do you need?  Might cheat and cast the thread in steel filled epoxy...

Sent from my SAMSUNG-SM-G891A using Tapatalk