Set machine coord to 0 (or a fixed value) so that UGS sees it (and its home works)?

[hmmueller]

I am totally happy with µCNC, happily routing along my aluminum parts, breaking a bit only rarely ;-) ...

But there's one thing I tried a few times, but did not succeed: I use UGS platform (with GRBL selected as controller). With X and Y and Z probing, I set the work coordinates with G92 - all fine. But of course, this does not set the machine coordinates, and therefore some UGS commands cannot be used. In my mind, I'd have to do something like e.g. G0 X10 Y10 Z10 (in my work coordinates); G10 L2 P28(??) X10 Y10 Z10 (make machine coordinates equal to work coordinates); G92 X0 Y0 Z0 (clear work offsets) - but this does not update the machine coordinates shown in the UGS platform GUI. Obviously, I don't understand something ... so I ask for help.

EDIT: I think I have not yet understood the coordinate systems, and what UGS does with them. This doesn't seem to be a µCNC question ... I'll read a little more.

Harald

[Paciente8159]

I don't quite understand what is your question.

Lets assume you are in coordinate 0,0,0 and there are no active offsets (so the working coordinate is the same as your machine coordinates)

Now lets say you want to move your work coordinate system origin to 10,10,10.

You don't need to move the machine to do this.

From were you are you can simple do a G92 X-10 Y-10 Z-10 (volatile as in it will be lost on power down)
Or a G10 L2 X10 Y10 Z10 (stored in memory and will be effective after power up)
Or a G10 L20 X-10 Y-10 Z-10 (stored in memory and will be effective after power up)

G92 and G10 L20 are relative to the current working coordinate system
G10 L2 is relative the the absolute origin of the machine (the same as using non modal G53)

Also note that UGS will display your current working coordinate and the machine current (absolute) coordinate.

[hmmueller]

I think there is a simple answer to my confusion: I have to add standard homing, using my limit switches. I didn't do that up to now ... let me try that, then, if there's something unclear, I might ask again.
Thanks for explanations!

[Paciente8159]

If you are asking about setting the machine absolute coordinate to a specific place...well that option is available if you don't have physical homing limit switches or have them disabled, but still want to set the machine home after placing it manually.

For that you need to enable option ALLOW_SOFTWARE_HOMING and then can use the $H command for this
This will not seek for the limits but will execute the pull-off and run the startup blocks like it would after a regular homing.

This will reset you machine absolute position to 0,0,0 (or not depending where you set your machine origin position after homing)