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Oversize cutting of internal threads

YAMAWA MFG. Co., Ltd.>Support & Inquiry>Bag Full of Wisdom when you are in trouble>Oversize cutting of internal threads
【英】困ったときの知恵袋詳細
Cutting Taps Trouble Shooting
When tapping with a tension/compression holder on a machining center, I sometimes have problems with the hole accepting the No-Go gauge (Oversize internal threads).
I don't see any chipping or welding on the tap and I want to know what else can cause this problem.
The feed rate of the tap must be matched with the "thread lead". We think the cause of the problem may be "over feeding" or "under feeding".
Please refer to the explanation on the attached PDF file for details.

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