Thickness of the part got undersized at edge area.|Due to process/Fixture issue thickness of some parts(11 out of 120 parts) in a batch found undersized at edge area.|1) The butting surface of the part is 3D but the formation of 3D surface in the fixture is not proper, due to that in some parts thickness got undersized at edge area.|2) On the butting surface area of the part a step mark is found, which is acceptable as per "Ra" requirement, but the same step has influence over butting of part to the fixture.