Is there a way to set machine position (MPos)?

[jkuusama]

Short question: Is there a way to set machine position (MPos)?

Explanation: I'm very close of being able to try grblHAL on my machine. I have some hardware in order, so I'm running my control software without actually connecting it to my machine. I expect that when I have the actual machine connected, I'm able to get the homing cycle running. I find that homing with switches usually works at 10-15um accuracy. My machine has hing resolution camera, and I can measure the homing mark position to 1um or so.

If I understand the documentiation and discussions correctly, bit 3 at $22 would set machine coordinates to 0 after homing. (Correct?) However, after homing I measure the real machine position. How would I set machine coordinates to where machine actually is, down to the last um?

[terjeio]

Is there a way to set machine position (MPos)?

Currently only to 0 or (negative) max travel (from $100, $101, ...). A plugin can be added that sets it to configured values and I have an incomplete template ready for that. grblHAL calulates and uses a workspace envelope to handle soft and jogging limits based on the home position and max travel, and a plugin would have to establish the envelope - but how? Offset from the home position? ...

Unless you use G53 for all motion the usual way to is to set and use a work coordinate system, G54 is the default. Typically one is set to whatever reference point is required - I usually set G54 so that zero is at the lower left corner and at the top of my workpiece.

[jkuusama]

Thank you. Actually, what I was missing was the $10=0 setting (report work coordinates instead of world coordinates). It just as easy to use work coordinates, let world coordinates be what they may.