Irregular Hobbing Feed marks in LH and RH Flank


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Posted by Sai Sagar on December 06, 2023 at 07:23:03:

Greetings to my colleagues from gear manufacturing Industry.

I am an gear hobbing application enginner. With respect to a new CNC 6 axis gear hobbing machine with Direct drive technology and EGB capable of hobbing upto 6 module and 250mm dia, we are facing a peculiar issue of uneven feed marks on gears cut on right and left flank.
1. Even 7 feed marks are observed on the left flank since the toot width is 7mm and feed is 1mm/work/rev. 2. The feed marks on right flank is uneven such that the feed lines are not evenly placed and parallel. only 3 lines ae observed.
Gear data is 2M, Z 76,Tooth width 7mm, Lead angle 5.43Deg, 4 start hob, dia 80mm.
Any suggestions of what might be the cause would be very helpful.

Thanks and Regards


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