● Tip Relieving
● Lead trimming
● Gear Inspection is Crucial
● Gear-shaping grinder
● During trimming 

● Profile shifting

Tip Relieving

          Tooth-profile trimming means trimming of both addendum and dedendum.
l Trimming addendum is to lower noise by preventing deformation interference between intermeshing teeth; tooth deformation is often caused by outer force when taking load during high-speed turning. 
l Trimming dedendum is to enhance its bending strength by chamfering moderately to eliminate stress concentration but not affecting the intermeshing.