Re: Z axis drive

I drive the quill on my machine with a ballscrew that stays stationary and
a ballnut that spins. The ballnut is mounted to the timing pulley, that is
driven by the stepper motor. The ballscrew is attached to the quill with a
bracket that is bolted to the quill stop clamp at the bottom of the quill.
There is about .005" slop in the whole arrangement, but it beats the .060"
backlash that I used to have driving the worm on the quill. Gravity seems
to help for backlash in engraving anyway. I yanked the worm drive and
pinion off of the machine and rely solely on CNC power for it. For
drilling, I use canned cycles. For tapping, I take the piece to another
machine.

Dan




At 07:17 AM 8/1/99 -0400, you wrote:

>From: Brian Fairey <bfairey@...>
>
>This is how I drive the Z axis on my knee type Taiwanese mill.
>http://www.sentex.net/~bfairey/Zdrive.jpg
>The two holes in the knob are for screws that clamp the knob to the
>pinion for CNC operation.
>Brian, Ont, Canada.
>