Quote Originally Posted by Ricardoco View Post
This made me ask if it was possible to drill through the spindle itself to fit a drawbar, any thoughts?? the 3hp er20 one looks like it would be worth doing. they may even be hollow in the first place, i didnt get a close enough look...
I've got a dead 2.2KW spindle which I striped and the shafts not hollow but wouldn't imgine it being too difficult to bore.?

Thou not sure how you'd go about drawing the ER collet.? Don't think the ER design lends it's self well to ATC thats why you don't see many, if any.!!