I converted a 47158 harbor freight micro mill to cnc. The cut that I am attempting to make is: facing a .250 piece of 2025 aluminum. Using a .250 cutter at 2000rpm. The tool chatters a lot. Even with a super low feedrate, ex. .25 IPM, still chatters. (not as bad but still there)
No play in the axes. There is backlash in the gear drive. Is this the trouble? More cutter speed? I can do the same cut with .125 cutter, and have no issues. (at the same feedrate) I need the .250 cutter, it is a ball end and I am using the ball at a different spot. Don't want to switch cutters. Help.