▲ 19 r/Machinists
PFA, content unrelated. Might be a dumb question but I ain’t the brightest anyways so here we go….
Chasing threads with a tap.
Sometimes the thread gage no go in the hole and hole need chased with tap.
We have 2 drawers in our machine shop.
One for cut taps, one for rolls taps.
I understand roll taps form threads by displacing material where cut taps cut threads by removing material.
My boss swears up, down, left and right that if you chase cut threads with a roll tap (or vise versa) you’ll bugger up the threads.
In my mind 1/2”-13 threads are dimensionally the same no matter how you cut them (cut, roll or single point/thread milling) so why can’t I just pick a tap, any tap so long as the diameter and pitch are correct?
TL;DR: when chasing threads can you use cut taps and roll taps interchangeably without screwing anything up?
u/Hazardousjelly — 1 day ago