1)New program and as well as new method used and manufactured the parts with reference sheet due to improve the quality of part.
2)Serration depth not getting consistent in the old method. So initiated to make new method.
3)Tried with dummy material with different methods and  finalized the best method. 
4)Guiding hole (free hole) not maintained to extra depth in the fixture.
5)Fixture is designed for hole mill but operator selected the reamer and increased the depth to achieve the correct size.
6)The solid material in the fixture leads to tool vibrate and hole oversized.
