Calculation of pilot hole

【英】困ったときの知恵袋詳細

Roll (Forming) Taps How to use

We are roll tapping a M6X1 thread in SS400 material. The minor diameter of the internal thread was created by the roll tap. The minor diameter seems to be different depending on the material being processed and the shape of the processed material. We have checked the YAMAWA catalog for a guide to get the minor diameter information but the diamteer seems to vary in different circumstances. Can you please tell me if there is a good way to find the optimum hole diameter?

You should machine the minor diameter of the thread based on the Roll Tap Drilled Hole Diameter as described in the YAMAWA catalog. To determine the optimum lower limit diameter, measure the actual pilot hole diameter and the finished internal thread minor diameter. Calculation formulas and examples are described on the attached PDF file, so please refer and try it.

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