....
In spite of anything you may read, any diameter can be successfully knurled,
assuming you're not using a straight knurl. ANY DIAMETER!

Secret to success is all in how you start the knurl. I've written an
article on that subject in the distant past. Pick up on the technique and
you can start a successful knurl virtually 100% of the time.

While it's true that a knurl is, in a sense, a gear of sorts, it is also
true that it can wander side to side, which compensates for pitch anomalies.

Harold

I hate to hihack iggy's thread. Well,not really.

Knurling is one lathe operation I still F$%^ up and don't know what
was wrong. I did go to a scissor type tool so the machine doesn't
provide the force and its balanced on forces. But sometime it still
comes out double tracked and I don't know why.

Care to look up or repeat your advice?

Karl