Re: [CAD_CAM_EDM_DRO] spindle counterweights

jag@... wrote:

> Anyway, there is a counterbalance on the spindle that consists of
> a chain that goes up and over the top of the machine (via some
> pulleys) to some weights that hang on the back of the machine.
> We experience some problems when there are rapid
> accelerations away from the bed and it also tends to overshoot
> when moving toward the bed. It will sometimes gouge when it is
> move down and has to stop rapidly.

Maybe have the chain going to a spring instead? The problem
seems to be inertia of the counterweight.

Changing the maximum Z deceleration rate (to a lower number than
you are using now) might go a long way to improving things too...

Doug Fortune
http://www.cncKITS.com