Re: [CAD_CAM_EDM_DRO] study, study, study

Weyland wrote:

> From: "Jon Elson" <elson@...>
> >
> > First, you need to know that the encoder will set the resolution of
> > the system then, instead of the stepper. If the encoder resolution
> > is much higher than the stepper, however, there will be many positions
> > that can't be reached (unless you have microstepping drivers) and
> > it will cause the CNC to wildly hunt for places it can't get to. You
> > will then have to put in a deadband to stop the hunting.
>
> Ahhh, thanks, that's good to know.
> What's a deadband?

In this narrow sense, it is an amount of error between commanded position
and actual position which will not cause the CNC control to attempt to
reduce the error. it is essentially a "close enough" decision.

>
> > You will need an encoder counter. The cheapest is the Dan Mauch
> > DRO, which I believe requires an ISA slot in the computer.
>
> Kewl, I'll check that out.
>
> Thanks for bearing with a newbie,

Well, I was one a few years ago.

Jon