Originally Posted by
Don Clement
This week I tapped about 800 blind 4-40 holes 0.25" deep in 6061-T6 using a Balax roll tap in a Procunier 1E tapper on my Tormach 1100. Spindle running at 1200 RPM, I feed the Procunier at 100%: down feed 30 IPM, no dwell, retract 60 IPM . Relton A9 was used as tapping fluid. No broken taps.
Don
I don’t have a Procunier tapping head, but since I learned to use the T/C tapping head I don’t think I need one.
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