There's also machine deflection, recycling the chips, and other nasty things happening that you can hardly feel through the handwheels.įor that reason you cut keyseats with an undersized cutter and take finish cuts off the sides.Ī case hardened old maintenence machinist once made me a replacement jackshaft shaft used to slow a drill press spindle down to a crawl. The deflection can be surprisingly large - up to 1/64 in the case of a 1/8' cutter on a 3/8' shank. Everything ismadeout of rubber according to the saying and even endmill deflect under load following the resultant cutting forces.
I know I'll get flak for this but never cut a keyseat with an on size endmill.
