is machine tight and in good condition?
(5) Okay, the marks look about right for one revolution. Now run the machine for a while, allowing the workpiece to rotate a number of times. You should see the cutter marks tracking in exactly the same place on the gear as the gear makes complete revolutions. Again, the width of cutter marks should not be getting wider. (6) If the cutter does NOT track in the same exact place, and conditions (a) through (e) above are ALL correct, then the index gears are not correct! Go back and repeat FIRST TEST above. One revolution of the workpiece is not enough for this test! Go off and get coffee and come back in 15-30 minutes. If the index is right, the shallow cutter marks will not change in size and will be clearly separated from each other. Maybe it should have been said before, but index gears must EXACTLY match the required ratio (e.g. 12/79). There is no room for approximations here. If by chance the index gears were only slightly different from the ideal ratio, the cutter will not stay in
