Thank you for your reply.
Imagine a piece of 1" round stock sitting upright in the vise. I use the
VERS.BY probe to find the center of it. Positioned approximately at centre and
about 0.18" above it. Then click on the find center icon. The Edge Length is
set to 0.400". After if checks the four edges it moves to the precise center.
No problem.
Now the same operation but with 2" diameter round stock. Edge Length is set to
1.0". Position approximately at centre and about 0.18" above it. Click on
find center icon. Like before, it moves over 0.2" past the left edge then down
and then toward the piece.
As before it touches, backs off, moves in really slowly and touches again.
Moves away, moves up and now it should move, 2x(0.2+1.0)=2.4" in order to go
past the right edge before going down.
Instead it moves to about 0.59" past the approximate centre point and then
stops and goes down. It runs into the piece because the code is expecting it
to be clear of the workpiece.
So the question is why does it move correctly for 1" diameter pieces and not
for 2" diameter pieces. Especially when the G-Code command as reported by the
print statement is which should take it to 0.2 past the other side of the piece:
G91
G1 X2.4
G90
Something really strange is going on. How can a print statement of the data to
the gcode command be incorrect?
print s
if self.gcode(s) == -1:
return
If this failed it should never go down and touch the piece.
> -----Original Message-----
> From: Zdenek Z [mailto:[email protected]]
> Sent: December 6, 2025 10:04 PM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Accessing python hal valriables.
>
> Describe the fault of move more.
>
>
>
> Do you use debouncing for probe signal?
> https://github.com/LinuxCNC/linuxcnc/blob/master/lib/python/gladevcp/b
> uiltin-panels/gtk_little_probe/README.md
>
>
>
> --
> Best Regards
> Zdenek Zdra il
>
> ---------- Puvodn e-mail ----------
> Od: John Dammeyer <[email protected]>
> Komu: 'Enhanced Machine Controller (EMC)' <emc-
> [email protected]>
> Datum: 7. 12. 2025 1:22:39
> Predmet: Re: [Emc-users] Accessing python hal valriables.
> "To add to this I can set the distance to 0.4" and then use the inner hole to
> find center. That works but again the distance is smaller.
> I've attached two small photos. Hopefully they come through.
> John
>
>
> > -----Original Message-----
> > From: John Dammeyer [mailto:[email protected]]
> > Sent: December 6, 2025 4:07 PM
> > To: 'Enhanced Machine Controller (EMC)'
> > Subject: Re: [Emc-users] Accessing python hal valriables.
> >
> >
> >
> > > -----Original Message-----
> > > From: Andy Pugh [mailto:[email protected]]
> > > Sent: December 6, 2025 1:35 PM
> > > To: Enhanced Machine Controller
> > > Cc: Enhanced Machine Controller
> > > Subject: Re: [Emc-users] Accessing python hal valriables.
> > >
> > >
> > >
> > > > On 6 Dec 2025, at 19:31, John Dammeyer <[email protected]>
> > > wrote:
> > > >
> > > > How do I access from workpiece_measurement.py the
> > > > variable:
> > >
> > > One way would be to create a HAL pin and set the value in that part of
> the
> > > code.
> > > But ?print? might be enough if you start LinuxCNC from the command
> line.
>
> > >
> > > _______________________________________________
> >
> > Thanks Andy,
> > I always have it starting from the command line so I can look at the
> output
> > for other issues. Here's the print statement I added to the python program
>
> >
> > # move X + 2 edge_length + 2 xy_clearance
> > tmpx = 2 * (self.halcomp["ps_edge_length"] +
> > self.halcomp["ps_xy_clearance"])
> > s = """G91
> > G1 X%f
> > G90""" % (
> > tmpx
> > )
> > print s
> >
> > Oddly it showed up on the console like this:
> >
> > G91
> > G1 X2.400000
> > G90
> >
> > And the probe only moved 3/4 of the way across the part then went down
> > and faulted due to touching the work before the move completed. It has to
> > have taken the G91 correctly or the X2.4 would be 2.4" across from the
> > rough center of the part.
> >
> > Yet if I jog back to that starting position and enter this into the MDI
> > command line
> >
> > G91
> > G1 X2.4
> > G90
> >
> > It moves all the way across the part to the position where it should go
> down.
> >
> > So the distance is correct and the machine is left in G91 mode when the
> > probe faults the move.
> >
> > Any ideas?
> > Thanks
> > John
> >
> >
> >
> > _______________________________________________
> > Emc-users mailing list
> > [email protected]
> > https://lists.sourceforge.net/lists/listinfo/emc-users
> _______________________________________________
> Emc-users mailing list
> [email protected]
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> "
>
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