Having some trouble with the Tickness understanding

[nexty5870]

Hi There,

I'm not sure that I'm the correct section;

here is my trouble,

I'm trying to understand how mach3 understand the tickness.

example: If I want to cut 0.5mm material, how I can put that?

(I'm making my gcode with Vcarve - I setup -0.5m detph tickness) but unfortunatly I'm not having off -0.5mm

do we have a particular method to put/calculate the tickness? such has puting the cutting tools at a certain mm on my Kress?

thanks you for helping.
Q.