Gear defect – accumulated false closing error of pitch out of tolerance

Main cause

The maximum error of uneven rotation in each rotation of the gear hobbing machine table is too large:

1) Transmission accuracy error of indexing worm gear pair

2) Large radial and end face runout of worktable

3) The meshing of the teeth dividing exchange wheel is too loose or there is collision


Focusing on the accuracy of the gear dividing kinematic chain, especially the indexing worm gear pair and hob:

1) Repairing transmission accuracy of indexing worm gear pair

2) Repair the rotary accuracy of the worktable

3) Check the meshing tightness and operation condition of the split exchange gear