Back to this thread from the Broach and Broach guide examples.
The socket driver is complete
and fits onto the motor+planetary drive perfectly.
I tightened up the draw bar with a torque wrench to 220 inch-lbs which is about 18 ft-lbs. That's about what I end up setting it to with a wrench. I put a wood working clamp on the motor so I could hold onto it and then jogged counter clockwise. The assembly had no trouble loosening it.
Max step rate from the ELS is 20,000 steps per second. Set up to have 1600 steps per rev and turning the 25:1 drive means it takes 40,000 steps to make one turn of the socket. That's two seconds per rev from the motor turning 750 RPM which is about max before a stepper starts to see torque drop off to the point of being useless.
But I think this will work.
A few things though:
I made the 3/8" drive nub the same length as the torque wrench or ratchet I really should have made it longer. The hole in the socket for capturing the drive isn't in the right place. So it looks like I should make a new one with a longer piece.
Backlash on the mill is still an issue even though I believe I have the correct amounts into LinuxCNC. It doesn't locate the center of a part using my touch probe as well as I'd like.
Oh and cutting the soft steel nub was done at 1150 RPM, F4 feed rate and 0.015 depth of cut over the length of the nub done with a 0.25" ball mill.
Now to start on a new frame design that will hold this motor drive assembly.
