internal metric thread

[Hotswarf]

Hotswarf, something less than 1/2 the angle is desirable for threading with the compound.

If the tool travels in at just a little less than 1/2 the included angle it will take a small amount from the right thread flank and clean it up as you go. If you go in at 1/2 or more then there is a (very) good chance you will leave a staircase effect on the thread flank, which is not desireable.

Cheers Phil

Totally agree Phil. Good advice.

 

[savarin]

I set the tool upside down and cut on the back side of the hole.
It went very well.
Its now screwed to the spindle and I'm turning the disk to dia and facing.
Thanks Guys.