Gibbs not cutting my extruded surface

[machinebox]

I'm a student learning Gibbs and am having an issue with Gibbs cutting my extrusion. I have a simple 2x2x1" square which I want to extrude a 1.75" square boss, to a depth of .10" However, when I select the top surface and the bottom surface (z-depth), and run the simulation, gibs cuts the whole surface down to a depth of .10. How do I correct this?

I appreciate any help!

[cadman]

Sounds like incorrect parameter settings in your process and/or selecting the wrong surfaces to cut. Post your VNC file or a screenshot so we can see what you are doing.