Rob Jansen wrote:
> I started converting my EMC2 mill from parport to the Mesa 5i20 hostmot2
> stepper and got stuck with a problem.
Another brave hm2 testing volunteer! Welcome!
> I keep getting "joint xxx following errors". I checked the docs but
> cannot explain this: ferror, min_ferror, max_velocity and
> mac_acceleration are the same in both cases and - although not necessary
One problem with the configs you linked below is that
[TRAJ]MAX_LINEAR_VELOCITY is greater than [AXIS_?]MAX_VELOCITY. That
means the hm2 stepgen will fall behind where the trajectory planner
wants it to be, leading to following errors if it gets too bad.
There's also no [TRAJ] acceleration limits, i'm not sure what it will do
in that case.
Oops, i see that the hm2 sample configs has the vel and accel settings
sort of messed up, i'll fix that for the release.
> - I added the base_period to the hostmot2 configs.
This config has no base thread, so it needs no base period (but it won't
hurt to have one). With Hostmot2, the base thread is running in the FPGA.
> A second problem (maybe related ?) is seen during a manual jog. When an
> axis stops it keeps humming and the digital readout flips between the
> current position (e.g 2.001) and adjacent positions (e.g. 2.002).
>
> This was all done on 2.3.0~beta2 with the hm2_stepper config files from
> that release.
The humming and dithering across the setpoint is a known bug in
2.3.0~beta2, it's been fixed in CVS and will be in the next release.
--
Sebastian Kuzminsky
We need numbers, not adjectives. -- David MacKay
<http://www.withouthotair.com/>
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