I am new with using ball nose bits. I am working with .25 Aluminum. I am being instructed to first run a pass at .112 deep with a regular endmill 1/4 inch bit and then I am to use a 1/2 inch ball nose bit to go over that same tool path. It is for a bend line, so that the guys in the shop can bend the material. Any advice on how fast to run the ball nose bit at? I am using a multicam 3000...Any help would be very much appreciated.