Threading issue

[Janith]

When I machining threads in my HAAS VF2 machines always the threads are not neat. They don't have sharp edges. Thread gauges are not enter to them. Material is stainless steel. I am not using any tapping attachment. Only tap attached to the collet.

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[sinha_nsit]

Check bore diameter.

[Janith]

For M12 x 1.75 we use 10.3mm drill. I know correct dia is 10.25 but 0.05mm for easy tapping.

[sinha_nsit]

Higher bore dia would not give sharp edges.
10.25 may not be available, so 10.2 can be used.