Machinery's Handbook is too contradictory and I can't make sense of their charts on this. I need to cut some internal Acme threads on a set of jackscrews I am making as a school assignment. The thread is 1/2"-10 Acme. I need to find out the right tap drill size so I have some material left in there for the threads to be made out of.
2006-11-21 14:13:28 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Engineering
my reference only has 1/2" x 13 threads per inch (american national coarse threads) and it calls for a 27/64 drill (.4219"). I'm thinking 10 threads is (coarser and larger ) so it should get a good "bite" on the id of the hole. If its gets too tough to tap, you could add a bunch more oil or go back and drill a little bigger hole like maybe 7/16" (.4375)
2006-11-21 14:23:29 · answer #1 · answered by MrWiz 4 · 0⤊ 0⤋
Use a 3/8 tap and you will not be far off your target!
NDS
2006-11-21 14:29:10 · answer #2 · answered by Nikolas S 6 · 0⤊ 0⤋
I went to SimetricCo. and the say a 0.402572
drill
2006-11-22 03:26:53 · answer #3 · answered by hrb0044 2 · 0⤊ 0⤋
Look up a Zues table
2006-11-21 15:58:07 · answer #4 · answered by Anonymous · 0⤊ 0⤋