Archive for the ‘drill’ tag
Drill Tap
Where can I find info on tap drill size when cutting Acme internal 1/2-10 threads?
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.
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)
Drill and Tap Tips and Tricks – Kevin Caron
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