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General Mach Discussion / Re: BT30 spindle from scratch - with power drawbar and ATC of course
« on: September 21, 2012, 03:11:21 PM »
Looks a nice design however may just throw out another idea. My friends Beaver mills changer uses balls and a small spring in a similar fashion to your drawbar. There is a small air cylinder above the tool release position so when the correct tool is in position and the clamp is gripping it the cylinder pushes down on the spring and releases the pullstud, I thought it was quite a nice idea and the spring pressure needed is small so any old valve spring would be more than enough.
Hood
Hood