Recent content by JonGould

We just finished some parts in 38Rc 4340 with the Kennametal KSEM drill which now comes in lengths up to 10XD. We were not getting consistent results reaming so after initial tests we found that we could hold 35Ra finish and had no more than .0018 walk in 9". Like others have said, this costs...

" For other Thread depths: (Thread Depth * (1 + Thread Pitch * 4)) + (Thread Pitch * 9) " Sorry, this should have been: For other Thread depths: (Thread Depth * (1 + Thread Pitch * 4)) + (Thread Pitch * 5)

Tap drill depths for spiral point plug tapping blind holes. For over 40 years I have waited for a definitive formula that would work well for calculating tap drill depths for blind holes. For 30 years I have used the simple formula of Thread Depth + Thread Pitch * 9 for threads of two...