I have been testing out versaprobe in qtdragon and noticed a problem
with inside corners.
The retract in the X-direction after the slow probe is typically to
small, so that when the Y-direction fast probe is done
it is to close to the inner y-dir edge. If there is a radius in the
corner (which there normally is with a pocket cut with a endmill), then
the probe in the y-dir will hit in the radius part and not on the x-dir
edge. This will produce an error in the y-position of the corner.
One can perhaps get around it by using a large latch retract, but this
will slow down the whole process.
The cause of this behaviour seems to be the new xplus and xminus
routines included in qtvcp/widgets/probe_routines.py (Not sure, probing
routines are at many places in linuxcnc under different names. Very
confusing. I hope it gets cleared up one day, with a clear distinction
between a tool setter (which cannot move, but has a height) and a 3d
probe (which moves)).
The original xplus.ngc and xminus.ngc routines of versaprobe are
different in that they have a fast retract after final slow probe to the
original point where fast probing starts from. The yplus and yminus
routines are also different but seem to not effect the inner corner
probing since they occur after the x-dir movements. However they give a
wrong end result for the y-position of
the corner, since they touch on the radius part of the corner.
These differences do not seem to effect the end result of the other
probe routines, but is probably not in line with the aims of the
original author of the versaprobe routines.
Hope this helps to improve qtdragon. On the whole we (SA-CNC-CLUB) are
very impressed and thankful for the excellent work on it.
Kind regards
Rudy du Preez
Chairman SA-CNC-CLUB
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