Hi - Hopefully my screenshot attachment shows a toolpath blip near a boundry line. This is not on the G code - but only appears when opened with Mach3 - The cutter follows the blip - help welcome!

Hi, post your g-code and lets have a look and see if it is the same on my setup.

Graham.

Thanks Graham - g-code should be attached.

I have now tried similiar codes from similiar toolpaths and some codes give the blip - and some do not.

Regards

Hi Cliffh,

I think the problem is to do with the arcs,  if you go into general config and change the IJ Mode I think all will be OK.

Graham.

Many thanks Graham

I changed the IJ mode to inc and all is well.... I see ex the mach 3 manual 5.6.6 that this is a compatability setting.  I thought my supplier asked me to set to ABS - do you know if there is any downside to this setting I need to be aware of ? I could leave it in ABS mode and just change to inc when I have to?

Regards

The inc / abs IJ mode can be changed at will, if you are using a cam system that puts out abs arcs then you can modify the post processor to output a G90.1 on a line of its own somewhere at the top of the program. For inc arcs then the post needs to put out a G91.1

You will find that most programs output arcs as incremental.

Graham.

Thanks again Graham