help to determine plasma diameter in mach3

[rimawi2008]

hello every buddy
i build my plasma cnc machine and i dont know how to program plasma diameter
in mach3 and what g-code i can use to make correct measurement
for example when i need to cut a circle with 60mm diameter it become 58mm
because the thickness of plasma how can i make the plasma ray in or out my measurement
thank you

[rimawi2008]

no one can help me !!

[travisn]

try to draw a 62mm circle and see if it comes out 60mm.

Also, the offset tab might be of help. This is my first day with the mach3 so take that with a grain of salt