Re: close loop and stalling

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "William Scalione"
<wscalione@n...> wrote:

> George,
>
> Well from what I have heard from others this is a problem. If the

cause of

> missed steps is trying to run them too fast or too fast of an

acceleration,

> having encoder feedback will not help much as EMC will start

spitting out

> steps at an even faster rate, which will just compound the problem.

Keep in
... snip

I think a major advantage to closed loop steppers is the limitation
of errors before shutdown. I think any machine can be pressed to the
non-stepping point and where that is is difficult to determine. I
hope by using the system to find out where that point is before a
workpiece is ruined. I'm personally still pushing my machine to the
error points using Jon Elson's Universal Controller/EMC. The ability
to easily restart (sometimes) after a shutdown is nice.