RE: [CAD_CAM_EDM_DRO] Mixing servos & stepper in same system

I think you have been given poor advise. If you are going to use servos
on X & Y than use one on Z also. I had Bridgett set up with XY servo and
Z stepper for a while as I was locating another servo motor. When I
switched to a servo on Z my Z feeds increased by 50%. The problem with
steppers on my Z is that it is geared at 4:1 reduction plus the screw.
The stepper was always trying to go too fast. If you are still at a
point you can alter the reduction ratios just set up z with more
reduction and let those servo motors spin.

Tim
[Denver, CO]
Sherline products at Deep Discount
Mach1 & DeskCNC with credit card ordering www.KTMarketing.com/Sherline

> -----Original Message-----
>
> Guys,
> I'm stilll doing R & D on my system components, and it
> was suggested that I use a stepper to drive the knee's X
> axis, rather than a servo, because of the steppers better low
> speed torque. Is there any problem doing that, or would it
> accomplish the same thing by using the higher speed servo,
> and just increase the gear ratio.
>
> Marv Frankel
> Los Angeles