Leslie
Grumbler in Training
A quick easy way to cut reverse bevels is to cut them face up. You need production stops to do this. If I want to cut a 3" border I set the guide at 3". I set the stops at just under 3-1/8", then I cut the mat face up.
You do have to adjust the amount you add to the stop setting to suit your cutter.
You do have to adjust the amount you add to the stop setting to suit your cutter.