Ok, this card works. It cuts a 2x2 rectangle 10 mils deep, just like it is supposed to.
CR,2, 2, T, 1, 4,-0.01,1,2,1

This card does not. It "cuts" an air rectangle 1" ABOVE the work surface!
CR,1.0, 6.500, T, 1, 4,-0.010,1,2,1

I don't understand why, so I try the following.
CR,1.0, 6.500, T, 1, 4,-1.010,1,2,1
And of course, it jams the bit down through the work piece into the spoil board, trying to reach 1" below the surface I reckon. Fortunately nothing broke before I could get the thing stopped. Any ideas on what is wrong?

Thanks.