Z-Offset for Scribe
- Daddio
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01 Aug 2022 07:19 #248774
by Daddio
Z-Offset for Scribe was created by Daddio
Hello all,
I am running QtPlasmaC on 2.9.0 with sheetcam.
I added a pneumatic scribe that is mounted to the Z carriage that when actuated is driven down on a slide - pretty typical. Everything seems to be working except my slide can't reach the material. How do I add a Z offset for an engraving/scribing operation?
This is a problem when scribing is the first operation because Z is high up at Z home-offset. Whereas if a cut is the first operation, then the next engraving op is actuated from Safe Height rather than Z home-offset.
I tried adding a Z offset at T1 P1 X0 Y0 Zx ; scribe in the tool.tbl to the scribe tool, but it didn't do anything. It would be awesome to have a field to set the scribe height similar to the probe height.
Thanks!
I am running QtPlasmaC on 2.9.0 with sheetcam.
I added a pneumatic scribe that is mounted to the Z carriage that when actuated is driven down on a slide - pretty typical. Everything seems to be working except my slide can't reach the material. How do I add a Z offset for an engraving/scribing operation?
This is a problem when scribing is the first operation because Z is high up at Z home-offset. Whereas if a cut is the first operation, then the next engraving op is actuated from Safe Height rather than Z home-offset.
I tried adding a Z offset at T1 P1 X0 Y0 Zx ; scribe in the tool.tbl to the scribe tool, but it didn't do anything. It would be awesome to have a field to set the scribe height similar to the probe height.
Thanks!
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- LesNewell
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01 Aug 2022 11:55 #248784
by LesNewell
Replied by LesNewell on topic Z-Offset for Scribe
The tool table seems an obvious place for this. I'm not sure why it is not working. Maybe take a look at your logs to see if there is something in the tool table LinuxCNC does not like.
Try manually editing your g-code. Look for G43 H0. Change the H parameter to the tool number. For instance if your scriber is tool number 1 you'd have something like this:
If that does not work I should be able to modify the post to add an offset.
Try manually editing your g-code. Look for G43 H0. Change the H parameter to the tool number. For instance if your scriber is tool number 1 you'd have something like this:
N01230 T1 M6
N01240 G43 H1
If that does not work I should be able to modify the post to add an offset.
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- andypugh
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01 Aug 2022 12:17 #248786
by andypugh
You need a G43 to apply the tool offset.
I suspect that is all that is missing.
Replied by andypugh on topic Z-Offset for Scribe
I tried adding a Z offset at T1 P1 X0 Y0 Zx ; scribe in the tool.tbl to the scribe tool, but it didn't do anything.
You need a G43 to apply the tool offset.
I suspect that is all that is missing.
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- Daddio
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01 Aug 2022 14:54 #248791
by Daddio
Replied by Daddio on topic Z-Offset for Scribe
Hi Les,
I changed:
T1 M6
G43 H0 --> G43 H1
but got the same results, it doesn't grab the z offset.
I changed:
T1 M6
G43 H0 --> G43 H1
but got the same results, it doesn't grab the z offset.
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- snowgoer540
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01 Aug 2022 17:11 - 01 Aug 2022 22:54 #248799
by snowgoer540
Replied by snowgoer540 on topic Z-Offset for Scribe
The intent of the behavior of the scribe is that when it is "armed", the pneumatic cylinder would make the scribe touch the material. I suppose if moving the scribe's slide closer to the material is not an option, then you could try
Keep Z Motion
for the scribe portion of your cut file. In this case you might consider providing the coordinates via G53 so that resetting the DRO wont affect where the Z axis is positioned.
An easy way to set this would be to use a variable:
EDIT: see below for correct code
Where 1.001 is the distance measured from the top limit switch down.
An easy way to set this would be to use a variable:
EDIT: see below for correct code
Where 1.001 is the distance measured from the top limit switch down.
Last edit: 01 Aug 2022 22:54 by snowgoer540.
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- Daddio
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01 Aug 2022 17:37 #248800
by Daddio
Replied by Daddio on topic Z-Offset for Scribe
snowgoer540,
That throws a "bad number format (conversion failed) parsing" error..
That throws a "bad number format (conversion failed) parsing" error..
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- snowgoer540
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01 Aug 2022 17:58 #248801
by snowgoer540
Replied by snowgoer540 on topic Z-Offset for Scribe
I'll try to take a look after work.
does it fail on
or the G53 line I pasted above?
does it fail on
#<keep-z-motion> = 1
or the G53 line I pasted above?
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- snowgoer540
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01 Aug 2022 18:11 - 01 Aug 2022 22:55 #248802
by snowgoer540
Replied by snowgoer540 on topic Z-Offset for Scribe
I think this may be wrong (i copy pasted from the qtplasmac manual, but it doesnt match the gcode filter):
EDIT: see below for correct code
You could just use the actual number. G53 G0 Z-3.500
obviously change -3.500 to suit your needs.
EDIT: see below for correct code
You could just use the actual number. G53 G0 Z-3.500
obviously change -3.500 to suit your needs.
Last edit: 01 Aug 2022 22:55 by snowgoer540.
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- Daddio
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01 Aug 2022 18:59 #248804
by Daddio
Replied by Daddio on topic Z-Offset for Scribe
Yeah, something is up with the G53 G0 Z[{AXIS_Z MAX_LIMIT} - 1.001] line.
#<keep-z-motion> = 1 works no problem, same with the G53 G0 Z-3.500 at first test.
I'm basically adding it in as a code snip in sheetcam.
#<keep-z-motion> = 1 works no problem, same with the G53 G0 Z-3.500 at first test.
I'm basically adding it in as a code snip in sheetcam.
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- snowgoer540
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01 Aug 2022 22:49 - 02 Aug 2022 20:54 #248812
by snowgoer540
Replied by snowgoer540 on topic Z-Offset for Scribe
This should work:
3.5 would be whatever you need it to be of course.
Edit: I should note that I grabbed the original code I posted from the button code section of the QtPlasmaC manual without thinking. So, that would work for button code, but not for G-Code. Sorry about that
g53g0z[#<_ini[axis_z]max_limit>-3.5]
3.5 would be whatever you need it to be of course.
Edit: I should note that I grabbed the original code I posted from the button code section of the QtPlasmaC manual without thinking. So, that would work for button code, but not for G-Code. Sorry about that
Last edit: 02 Aug 2022 20:54 by snowgoer540.
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