Metal lathe snubs!
Err, instant reverse?
3 phase ?
On some old belt drive American steel, you can tap under "friction" .
Release the spindle and power up.
The belt will still spin the chuck with some power .
It actually works well for linen wrap work.
Yeah, that's how I do both operations it allows me to stop the chuck by hand. Great for wraps I can control the speed with the variable drive although the spindle is not engaged. I do have 3 phase and instant reverse but I prefer this way.