I am a quality control engineer in an automotive parts manufacturing company. One of our products is a rocker arm bearing which is essentially a cam follower. The OD and ID of the bearing is ground using CBN grinding wheels. The ID contains cylindrical rolling needles. Recently we have received a lot of customer complaints for flat marks on OD of the bearing. Can an air gauge be used to measure or detect these flat marks and also can a simple poka yoke be designed using the same.