Sam-
yes the pins behave in realtime but the two example components I was
discussing
https://github.com/cnc-club/linuxcnc-engraving-comp/blob/master/compensation.py
and
https://github.com/scottalford75/LinuxCNC-3D-Printing/tree/master/compensation
are userspace python and *not* realtime.
However of more import than the response of those pins is that they
happen far too late in the calculation chain - I need to make my changes
immediately after (encoder feedback) and before any machine coord /
workpiece coord / tool comp offsets come into play, so the e-offsets are
not feasible for this.
Thanks,
TH.
On 11/17/2023 11:51 AM, Sam Sokolik wrote:
are you talking e-offset pins? Those are realtime.. I am using a realtime
comp to do spindle synced motion... It works great..
https://www.youtube.com/shorts/nViXP9SsdWc
sam
On Fri, Nov 17, 2023 at 10:39 AM Ted <laser...@gmail.com> wrote:
On 11/17/2023 10:49 AM, andy pugh wrote:
Is this related to wanting to do height mapping, or laser rastering,
or something?
The end result is a multi-layer z-height and x-y-z-thermal compensation
system. (Yes, I know we have the "compensation" components, but both
offerings present by pushing data into the LCNC "offset" pins which is
far too late in processing for my application, as well as being purely
userspace). I need to be able to do my compensation directly after the
mag scales I have attached (to my CMM - a larger project scope) and
before any other value modification or motion decisions.
I looked at raster also; at first pass it might be a little too involved
as designed, but using hal_port with less complexity might be quite
viable. The next question would be to see if I will need to "chunk" that
data or if I can single-blob it all without losses. Not having the
realtime side need to handshake back to the userspace would be a
preferred path for stability. (Says he who grew up with 25 pin serial
ports...)
Thanks,
TH.
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