How to troubleshoot unstable dimensions in CNC machining? Field setup experience.

When CNC machining dimensions are unstable, the most common mistake on the shop floor is to adjust tool offsets immediately. Adjusting a little bit every time the dimension drifts might seem fast, but it will eventually lead to a mess. I learned this the hard way during a night shift; I eventually realized it wasn't a tool offset issue, but aluminum chips on the fixture's locating surface…