Re: [CAD_CAM_EDM_DRO] steppers or servo?

Alison & Jim Gregg wrote:

> Hi Terry and List.
>
> I'm not sure that I haven't missed something here, but what I
> consider as
> a servo may not achieve a move for various fault reasons elsewhere in
> the
> system, but surely it will still "know" where it is, and hence not
> "miss
> steps". Iagree with the comment re steppers, but a feedback machine
> (servo
> system) should surely hold the programme until it achieves the
> requisite
> end position for any move sequence, hence if it cannot complete the
> move
> the system will surely throw an alarm and stop?

When you get everything hooked up right, and the following error
parameters set so it doesn't trip on minor drag, then it works quite
well. Before I turned up the juice on my Z axis, it would occasionally
bind up on a chip on the ballscrew, and just stop. I broke a few
drills before I got the fault logic all hooked up, but it now will
stop the program and alarm if any axis lags too far behind, or if
a servo amp flags a fault.

Jon