I have been trying to ruff in with aprox. .030 stock on sides and .197 stock on two corners with .375 radius, with gibbs cam 6.1 year 2002 . I have isolated the radius and used + stock .177 , then .157 then .137 and so on till I have .020 stock on the radius , untill doing the complete contour. It does cut a lot of air doing so. When I check the box "stay in stock" it doesn't cut any thing. The help dialog says it will. Our books are for previous versions year 1999 don't show the "stay in stock" box. Aprox. 40 years in manual machine shops and 7 years in cnc shop.