Machining 17-4PH S.S

1

I’m having problem with drilling and tapping M2 x 0.4 hole on CNC mill

2

What are the issues? Is it chips in the hole? Tap braking?Using oil or coolant?

3

Tap breaks inside hole. using coolant with 20% concentration. Material 17-4PH is HRC 47.
Tapping M2 x 0.4 drilling hole with carbide drill 1.68 MM.

4

@KAZIMIERZALESZCZYK it looks like you’re doing it right. You might try some molly D oill.

5

@KAZIMIERZALESZCZYK did you make it through? Did you get your parts taped?