[lostit]

You'r g-code is in inches, and it sounds like you're machine is setup in mm's?

But that shouldn't really matter, as Mach3 will convert the code to mm's.

So, the .063 depth should actually be cutting a 1.6mm deep.

Bottom line, there's nothing wrong with the code, and nothing in it is telling it to plunge seep into your part.

My guess is that something is wrong with your Mach3 setup, or the process you are using.

it cuts fine with the test .tap file though, so it only has a fault when i use meshcam gcode.

i tried cutting this from my metal sheet but destroyed a few hundred dollars worth of sheet so i tried cutting it into mdf board. that mdf is 36mm thick...should i set the stock size to 36mm thick? i dont think it should make a difference because i only want it to cut down 0.63 and it should know where zero is? but im out of ideas...it will break my spindle if it keeps doing it