Knurling with a threading tool - video

[Jon]

Knurling with a threading tool and G33 CNC code. Why? Just to show off some CNC tricks on the net? Any real-world applications?

[mklotz]

Although I've never tried it, I suppose one could do something similar on a manual lathe by single-pointing a right-hand and left-hand thread onto the workpiece.

I'm not a great fan of knurling. It's fine on small adjustment screws, etc. that are only operated infrequently and with little pressure. With anything that is handled frequently or grasped firmly, e.g. hammer or screwdriver handle, knurling is unkind to the hands. Shallow fluting gives a good grip and is kinder to the hands. Jeweler's screwdrivers are often knurled, but I have yet to see a larger commercial driver with a knurled handle.

[Toolmaker51]

Knurling with a threading tool and G33 CNC code. Why? Just to show off some CNC tricks on the net? Any real-world applications?

End of video, a voice comments with possible disappointment "doesn't look like before". So a fault lies in program and/ or mechanics. It's far slower than conventional wheels on edge typical with CNC turning centers. Good luck. Hang a clamp knurler and sell parts.
I've a puzzlement whether knurling is actually helical. The process is, with a tool transiting rotating material, but the helix of properly aligned diamonds don't reflect it clearly. The angle, maybe imaginary, is now far less.
Accurate spacing would equal trying to program a super multi start thread, both left and right hand, and encoder able to interpret portions of spindle degrees. Short of more axes like milling and crossdrilling, not realm of normal turning centers. The video displays real poor results, unacceptable for product, and can't deliver on a mere inch length.
Knurling is so frequently misapplied, diamonds are the go-to, when straight knurls are more appropriate when fingers are involved.

[mklotz]

Knurling is so frequently misapplied, diamonds are the go-to, when straight knurls are more appropriate when fingers are involved.

So true; and for knobs gripped with the whole hand, flutes. Of course, flutes are just the macro version of straight knurls.