Re: [CAD_CAM_EDM_DRO] 5th axis/3rd z

carlcnc@... wrote:

> The z axis are rather heavy and will "backdrive" or fall when I cut
> power to the stepper,

Look at constant force springs. Hunter makes them, Reid and Small Parts
are sources. These look like a rolled up tape measure, except that they
want to stay rolled up. The spring action comes at the point where it
unrolls which remains constant. I am using a 7# CF spring to
counterbalance the added weight of a Sherline spindle and DC motor on my
MaxNC. There is virtually no mass to speak of, and zero stiction. Well,
zero for our needs anyway.

Jon