You are welcome to come tap a few holes and see.
Most of the work was in good quality CI, and brass. Did I mention over 300 of those holes were 'blind'.
If you treat your taps well and use plenty of quality tapping fluid
1-KiloHole is not that uncommon.--.- Dave
Can only say "Huh?" to that.
Near the end of
Every time I read about a tapping fixture/tool, I appreciate the VFD on my drill press just a little more. To tap I turn the VFD to 5 Hz (30 spindle rpm), chuck up the tap and do it. The foot operated forward/reverse makes backing off (chip breaking) a piece of cake. And I never have to fuss with alignment - the tap is in the same chuck as the drill bit just was. Torque is sensed by hand-holding the vise.
Works for me, Bob
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