WCS Offset Question

[Gary Campbell]

While any of the WCS are active I can use G92 X# Y# Z# to set an offset. Is there a command that would remove them and set that WCS offset back to Zero?

[cnc_smith]

G92 sets absolute positions. With a G92 you move the part zero to the current position. If you do a X0.0,Y0.0,Z0.0 it re-sets part zero where it currently is sitting. Unless you wrote down the difference that you changed it by there is not a way to go back. Using a G52 Offset Local Coordinate System you can you offset the part zero by a specified amount. When done issue another G52 with a Zero value for the axis that you offset and part zero is back where it was original.
Example. G52 X3 Y-2 ; Part zero for the current WCS is shifted for X plus 3 and Y minus 2 as an absolute value from the current part zero. A G52 X0 Y0 shifts part zero back to what it was original. The values for the G52 are absolute. So if you issue another G52 with G52 X3 Y-2 the Part zero is not moved. With a G52 X6 Y-4 it is move this amount from the original part zero. not the last G52 that was issued.

[Gary Campbell]

Thanks for the reply. I had hoped I missed a command.

I currently have a macro setup that does a G53 X0y0 and then G92 X0Y0 to remove the offsets when needed, but I was hoping there was one that didn't require motion to the MCS 0,0.

Maybe a machine variable for the current X and Y position? Like G92 X{current mcs x} Y{current mcs y}

[cnc_smith]

With the G52 there is not any motion. The DRO updates to the current position where it is setting.