Regarding the drawbar and gripper, did you make it yourself and do you have picture of it? What ballsize do you use?
I have build a 6x5mm ball gripper but I get dents on the pullstud (using 45deg) and don´t know if this is normal since it could affect runout I assume.
I´m using about 800pounds of force from bellevilles springs.
I also have a VFD with 2 pole 3-phase engine and planing to use index signal to orient the BT30 holder. Can you provide more detail about the shot pin, picture of it would be super?
Nothing special on the gripper. Just the same 4 ball that everyone else has done. I'm using .187" balls and about 1000 lbs of pull. I just checked my pull studs and I have no signs of wear.
My mill has a step pulley. I'm using a small pancake cylinder. It was double acting so I took it apart and added a return spring. No chance of it coming down unless it's told to. The rod came drilled and tapped for an 8/32 bolt. I cut the head off of the softest screw I could find and screwed it in the cylinder rod. That way it MAY shear off if there is a problem.