Machines

[xoxoxoBruce]

It's held down by a vacuum table, but you're right. After the pockets, center hole and outline are cut there isn't a hell of a lot of surface area to hold it. Also, that pad, for lack of a better word, beneath the part so they don't cut into the table, must be porous so the vacuum can reach the part. After so much is cut away there must be a large amount of wasted vacuum. It must be a hell of a pump/reservoir to maintain enough vacuum on the part.