Erik Christiansen wrote: > > > Ah, it's off with the quill feed pinion, capstan, and fine feed worm > then, unless milling the 3 bolt holes to slots will allow the pinion to > slip into pefect mesh with the rack on the quill. That will only move one side of the pinion, leaving it crooked. Anyway, these racks were never made to eliminate cyclical error, which could be pretty large. So, you need to get rid of the rack. See http://pico-systems.com/zaxis.html for some pics and description of how I did it. > There's then room to > fit a vertical ballscrew, clamped externally to the quill nose. No, I would not do that. It will be very hard to make this rigid. A friend has a benchtop mill with that rig, and it is very flexible. That's why I did it from the stop ring bolt hole.
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