can I define G55, G56, etc as an offset from G54?

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02 Aug 2021 21:38 #216752 by gerrg
I'm wondering if there's a way in G code to define the X0 and Y0 of different corrdinate systems as an offset from another corrdinate system. Lets say for instance that I want to have 3 corrindate systems, G54, G55, and G56. I want to manually set G54 just by touching off something on my workspace. then i want to define G55 as being +100mm in the X direction, and +0mm in the Y direction, and have G56 as being +200mm in the X direction and 0 in the Y. Is that possible?

I know i can do it manually, but I'm hoping I can do it in Gcode somehow. I would even be fine with doing something weird like below (in sudo-code)
G54
G90
G0 X100 Y0
G55
<some G code to set G55 origin)
<repeat for G56>

This might be a strange request, but I figured I'd ask you all who know much more about all of this than I do. Thanks for your help!

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02 Aug 2021 23:39 #216756 by andypugh
Yes, that can be done with a combination of G10 L2 and numbered parameters .

For example, so set the offset of G55X as 100mm greater than G54X

G10 L2 P2 X[#5221 + 100]
The following user(s) said Thank You: joekline9

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03 Aug 2021 00:09 #216761 by gerrg
I had just found that and was coming here to ask if that was correct. so it would look something like this, right?
G54 (switch to G54 cord system)
G90 (use Absolute Positioning)
G0 X0 Y0 (go to origin on G54 cord system)
G10 L20 P2 X-100 Y0 (set G55 orgin to +100mm on the X axix and 0 on the Y compared to G54)
G10 L20 P3 X-200 Y0 (set G56 orgin to +200mm on the X axix and 0 on the Y compared to G54)

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03 Aug 2021 00:11 #216762 by gerrg
oooh, i don't even have to move the machine then, that's nice! I guess #5221 is the variable for the X orgin for G54?

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05 Aug 2021 23:36 #217016 by andypugh

oooh, i don't even have to move the machine then, that's nice! I guess #5221 is the variable for the X orgin for G54?

Yes: linuxcnc.org/docs/2.8/html/gcode/overview.html#gcode:parameters

(There are lots of useful parameters that you can use) 

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