These work for a lot more than just cutting off stuff.
I made this holder so that I could grind flats on really hard shafting.
Worked so well that I use it for shaping HSS tool bits.
Using a four jaw chuck and square stock, the tool post can be angled and the height adjusted for making all sorts of tooling.
Rotate the chuck five degrees for relief angles.
Homemade polycarbonate guard removed for the picture.
The sparks shoot straight forward and miss the lathe bed completely.
I power the grinder through a HF router speed control.
It's a bit underpowered, but the system works really well.
Dennis