Reasons and consequences of gear undercuts

The reason for the undercut: when the intersection of the tool tooth top line and the meshing line exceeds the meshing limit point N1, and the tool continues to move from position II, the involute tooth profile that has been cut at the root is cut off again.

Consequences of undercutting: gears with severe undercuts, on the one hand, weaken the bending strength of the gear teeth;The reason for the undercut: when the intersection of the tool tooth top line and the meshing line exceeds the meshing limit point N1, and the tool continues to move from position II, the involute tooth profile that has been cut at the root is cut off again.