Need help changing an X or Y coordinate into a variable

Strider007

I need to be able to take an unknown X or Y coordinate and set it as a variable in a macro.

I'm using the G38.2 command to find an edge for use in a calculation. The G38.2 command works as expected and stops correctly at the location it is triggered. I can see the X and Y locations on the DWC or by using a M114 command but I do not understand how to change that into a variable I can use in a macro for a calibration calculation.

With a G30 command I can get the Z coordinate using
"global.autoz_tempx0 = sensors.probes[0].lastStopHeight

How can I accomplish this with the G38.2 command, having it provide the X or Y coordinate?

Any help or direction would be greatly appreciated.

fcwilt

@Strider007

Are you asking how to get the X and Y values to use in some gcode?

Frederick

Strider007

@fcwilt Yes, I send a "G38.2 X10 F100" command, the machine moves until the sensor is tripped and stops. I want that exact X coordinate where it stopped as a number to be used in in alignment calculations.

zuoyan

@Strider007 You can search "duet object model", it should be move.axes[0-1].machinePosittion -- You can also explore the object model list in DWC

fcwilt

@Strider007

See if this will work:

For the X:

move.axes[0].machinePosition or move.axes[0].userPosition

For the Y:

move.axes[1].machinePosition or move.axes[1].userPosition

Frederick

Strider007

@fcwilt Thanks,
Ok, tried all combinations of your suggestions and only got error messages as follows:

move.axes[0].machinePosition
Error: Bad command: move.axes[0].
Error: Bad command: machinePosition

I had hoped that would work and had tried it already. What am I missing here?

I

Strider007

@zuoyan
Its a long list, and I've looked through it multiple times. I probably should have mentioned that. That's when I found the two suggestions that fcwilt gave me but no success so far. Thanks

Strider007

@Strider007 Ok, now studying M409, and I think I got this working.

Thanks all

fcwilt

@Strider007

Those are not to be executed - they are merely variables holding those values.

To use such values, say, to move to a position, you would do something like

G1 X{move.axes[0].machinePosition} Y{move.axes[1].machinePosition}

The question is do those variables hold the values you desire. Compare them against what you see in the DWC, assuming the DWC is showing the values you seek.

Frederick

Strider007

@fcwilt
Yes, when I echo, that is the number I want to store as a temp variable then use in calculations of tool offsets.

echo "it is", move.axes[0].machinePosition
it is -118.088

Thank you for your guidance. I believe I 've got it from here.

fcwilt

@Strider007

To save a value from the Object Model (OM) into a local variable you do something like:

var Xvalue = move.axes[0].machinePosition
var Yvalue = move.axes[1].machinePosition

Or it you want it to be persistent so you can use it later or in other code:

global Xvalue = move.axes[0].machinePosition
global Yvalue = move.axes[1].machinePosition

Good Luck.

Frederick

Strider007

@fcwilt Exactly what I needed to get past my mental roadblock. Some small code blocks doing just what I need. Now to refine the hardware to go with it. Most appreciated Gilly