How to prevent tap breakage problem

【英】困ったときの知恵袋詳細

Cutting Taps Metric Threads Trouble Shooting

I'm using a standard M8 × 1.25 tap to process a S25C steel material that has a through hole thickness of 15 mm with a flood coolant. I continue to have problems with chipping of the cutting edge and occasionally tap breakage. I've heard that a spiral point tap is best for my application to push the chips forward out of the bored hole. I've also been told it does not break easily, why is that? Is there anything to pay attention to or what to check?

Spiral point taps rarely have cutting edge chipping or tool breakage problems. If you face such a problem while tapping with a spiral point tap, the chips are not ejecting smoothly from the bored hole. Please check the following: (A) Is the tap's cutting chamfer tapping beyond the end of the component? (B) Is there enough space at the end of the bored hole to eject the chips smoothly?

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