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Rant: nobody warns you that rigid tapping eats taps if your spindle speed is off by 50 rpm
I was running 1/4-20 threads in 6061 on a Haas VF2 and snapped three taps in one afternoon before I figured out what was happening. A setup guy from the other bay walked over, looked at my program, and said my rigid tap was going in at 800 rpm when the feed rate only matched 750. That mismatch was enough to strip the thread and shear the tap every single time. I dropped it to 500 rpm, matched the feed to 0.05 ipr, and ran 60 holes without a single break. Everyone talks about coolant and peck depth but nobody mentions that rigid tapping is way less forgiving than a floating holder. Who else has torched a tap because the speed and feed were off just a hair?
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barbara4298d ago
Wait, only 50 rpm off and it snapped three taps? That is wild because you would think a rigid setup would just cut a slightly different pitch and maybe thread a little weird, not straight up shear the tool every single time. No wonder nobody warns you about it, most guys learn this the hard way before they ever hear the real reason.
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