Cutting height not changing

[regpye]

I need a little help please, I am not experienced enough to work out this problem yet.

Not sure why this is happening, but for a while now I have experienced a drop in quality of cuts with my homemade plasma CNC machine.
I have had to reduce the speed a lot in order to make a cut and the dross is now quiet a lot compared to what I used to be getting.
The other day I was watching a cut and noticed that the cut height is not correct, it is not changing from the pierce height.
Various changes have been made over the last few months to the post processor, and I am not sure what changes have been made now, so maybe something is not correct there??
My machine uses GRBL 1.1h and Universal Gcode Sender (platform version)
I have added a support file generated by SheetCam that has an example of my last cutting job, which was mainly centre punching and a circle cut.

centre (correct Australian spelling)

[Les Newell]

It looks like a machine setup issue. Here is a chunk of code taken from the tap file in the support file:

Code: Select all

 Z3.0000
 M04 M8
 G01 Z1.5000 F700.02
 G02 X133.0199 Y51.9640 I0.7044 J2.4612 F450.0
 G03 X133.0199 Y51.9640 I-63.0199 J18.0360
 M05 M9

You can see the pierce height is 3mm then it moves to a cut height of 1.5mm before cutting out the circle. Maybe try reducing the cut height.

[regpye]

Thanks Les, I will check my machine out and see if I can find the problem.