Locating certainly and the following problems should note when clamp plan: (1) accomplish a design as far as possible craft is fiducial, fiducial as fiducial as process designing computation unity; (2) center working procedure as far as possible, reduce the number that hold clip, can machine an entire work surface after holding clip as far as possible; (3) avoid to use occupy machine is artificial the plan holding clip with long settling time; (4) the action of clamping force chooses the place with should fall in workpiece tigidity better. It is good that if pursue,the axial tigidity that A Bao Bi covers compares radial tigidity, be out of shape with the workpiece when blocking ungual radial clamp big, the axial that be like an edge brings to bear on clamping force, be out of shape the conference is small much. When the thin wall casing that in clamp graph B place shows, clamping force do not answer action is in the end face of casing, and should on the chimb with better in tigidity function, or instead is on end face at 3 o'clock clamp, change exert oneself chooses the place, be out of shape in order to reduce clamp, if pursue,C place is shown. Point of action of C graph clamping force and clamp metabolic concern CNC Milling