We do this type of facing all the time. We use a 2" diameter single point flycutter at 3000rpm and 10ipm, .010" depth of cut, flood coolant is on. This is on a finish pass where I want a mirror like finish. I can actually see my reflection quite clearly on the surface when using this method. Are those steel jaws? I would make myself a set of aluminum softjaws, the aluminum softjaws deform enough to hold the piece rigid if you have any variances on the gripping surface due to irregularities in the workpiece, in fact we only use aluminum softjaws around here, they are cheap and easy to make as well as great at holding parts fairly rigid. We often face 6"X6" plates at .500" thick with a very nice looking finish. I noticed that on you parts the marks are more pronounced away from the center, most likely from lack of rigidity and endmill selection. Hope this helps. |