On 04/11/2018 23:17, John Dammeyer wrote:
The process isn't severely compromised by that two step shortfall. So we
can go on by ignoring motion complete. But this has all the appearance of
something that will fail worse later on if not addressed.
Am I being too fussy?
No ... if the drive element was a linear motor, then there is some
justification for slight under or over shoot, but if the drive element
is a stepper then the fact that you know there is an undershoot but
nothing is done about it suggests that the software is buggy!
The Taig closed loop works by continuing to apply power until a step
actually happens ... then it tries the next step ... so eventually all
the requested steps happen ... just not necessarily in the right order
across all axis :(
In you case the process is obviously missing the occasional step which
the encoder SHOULD be reporting and additional steps then need adding at
the end. Again if multiple axies are involved he sequence will be out of
sync which may be a problem, but for a single axis move there is no
reason that simply adding extra steps is not a solution? The fact that
the software KNOWS it has not finished yet means it's not working
properly! At the very least I would expect it to report a failure ...
it's commanded 2549 steps but only 2547 have happened ... then the
control software can either ignore the error, or request an extra 2 steps?
--
Lester Caine - G8HFL
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