forum.cncdrive.com

Hi,

The M17 macro set the variable #3 to either 0.0 or 0.5.

I can't figure out how to use it in GCode formula.

Code: Select all

...
#3 = 0.0
M17
...
G00 Z80.000
G00 X10.000 Y10.000
G01 X10.000 Y10.000 Z[8.000+#3] (brackets are not interpretable(they, and everything in it, appear in red in the GCode viewer))
G01 X10.000 Y10.000 Z[#3+8.000] (same as above)
G01 X10.000 Y10.000 Z#3+8.000 (will ignore the +8.000)
G01 X10.000 Y10.000 Z8.000+#3 (will ignore the variable)
...

I fear I have to recalculate the Z value for each and every line.
Something like:

Code: Select all

#103 = Zcoord + #3
G01 X10.000 Y10.000 Z#103


Is that right?

Cheers

Yes, you are right.

Thank you dezsoe.

So far, everything seems to work properly with this method.
The GCode is a bit harder to read, the file size is practically doubled but hey! if it works!? Let's carry on!

Cheers!

Hi!

I've been using the previous solution and it works fine but I know encounter the problem that if I merge various GCode together and separate them by M00 (wait for operator to Cycle Start before continuing), the value of #3 is lost ... from what I can understand, it is set to 0 after the M00.

Is there a more robust way to set a variable?

For now I just ask the question again every time I pause but it's redundant and there's a risk of error (if the operator makes a mistake when retyping in the value).

Thank you

M0 (or any other internal command) will not zero any variable, so check your g-code, there must be a line that changes it. Also, if you call macros or you have any macroloop then check them.