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