Re: [CAD_CAM_EDM_DRO] Re: Encoder resolution

Jon,

I see, so one allowable error is based on machine acceleration/speed exponentially. And another monitors the axis at rest/hold. How does EMC handle this discrepancy? Does it fault the software or does it correct it self on the next ramp down?

Ron

Jon Elson <elson@...> wrote:
Les Newell wrote:

>Hi Scott,
>
>The lock range is not adjustable on the current models. I believe it
>will be on the new range.
>Either way you can work around it with tuning. You cannot have as
>aggressive acceleration with Geckos but does that really matter? Unless
>you are doing heavy production work the overall machining time
>difference is negligible.
>
>Of course the ideal is a true servo operation where the computer can
>have two different following error limits, one for rapids and one for
>cutting. AFAIK the only hobby controller capable of this is EMC.
>
>

EMC has a continuously sliding scale. it has one setting for allowable
following
error at rest, and another factor proportional to velocity. The
instantaneous
allowable following error is the sum of the two. So, the faster you
command it to
go, the greater the allowable error. This allows for very small error
when moving
slowly, but allows a much larger error on rapid feeds. These two
parameters are
user-settable, and different for each axis, so you can set it as tight
or as loose as
you like.

Jon



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