Silly Tool Change Question

[MikeJames]

Why is it that the Hxx code always appears at least a few lines after the Txx M06 code?

N30 T2 M06
N35 S8000 M03
N40 G54
N45 M08
N55 G00 X0.3744 Y-0.265
N60 G43 Z0.6 H02

I can sort of understand why you'd want to separate the code as two different instructions (so we can use G43 vs G44?), but why aren't the M06 and Hxx instructions nearer to each other?

And why throw the Zxx instruction in the H line?

Enquiring minds want to know....

Thanks,

Mike

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[Jim Dawson]

N60 G43 Z0.6 H02 Doesn't actually move the Z, It just applies the tool height offset. The next line should move the Z to its next position with the height offset applied.

[MikeJames]

Hey there Jim.

Does the Z0.6 have any function? Where does the 0.6 come from?

And why the distance between the M06 and the G43 H?

Thanks mucho for the quick response.

Mike

[Jim Dawson]

The Z0.6 should come from the tool height offset table.

N30 T2 M06 (load tool #2)
N35 S8000 M03 (start spindle)
N40 G54 (set the work coordinate system)
N45 M08 (turn on flood coolant)
N55 G00 X0.3744 Y-0.265 (rapid move X & Y to initial position)
N60 G43 Z0.6 H02 (apply tool height offset)
N65 G00 Zx.xx (move Z to initial position)

[ger21]

This all has to do with the way the post processor was written.

[MikeJames]

Maybe I'm dense (probably) but the CAM software (F360 and PP) doesn't have any idea what the tool offset is. What am I missing here?

[MikeJames]

Thanks Ger.

Is it just traditional to have the G43 H come after the spin up, or is it a purposeful delay?

[Jim Dawson]

Maybe I'm dense (probably) but the CAM software (F360 and PP) doesn't have any idea what the tool offset is. What am I missing here?

That is not quite true The tool height table can also normally be set in the CNC software tool table if it exists.

[MikeJames]

I've done a few tests in F360 and have determined that the Z.06 is the clearance height for the toolpath.

[MikeJames]

That is not quite true The tool height table can also normally be set in the CNC software tool table if it exists.

That appears to be the tool number, and not the actual offset. But you're getting closer! Thanks Jim!