Since I got good answers asking about the servos on my new-old Milltronics Partner mill, I thought I'd ask a few more about the whole power drawbar system. This has a 40-taper spindle with a large air piston which presses down on a drawbar. The drawbar has a stack of cone (belleville) washers which I believe get compressed, allowing the drawbar to move downward and release the tool via a retention knob (like the quick connects on air tools.)
Here are my questions:
1) What size retention knob do I need for the tool holders?
2) How are the cone washers assembled and how do I know how many I need? As a guess, I figure they alternate small to large so as to be able to compress.
3)Do I need to provide compressed air to both sides of the piston assembly, or is it enough just to valve air to the side that pushes the piston down onto the drawbar?