How can Anodize dimensions be controlled when tolerances are tight?
This can be accomplished by a combination of methods all of which should be worked out between the manufacturer and the Anodizer before production begins. The methods can range from simply choosing a very thin anodic film (if allowed), to a combination of controls in manufacturing, chemical preparation at the Anodizing shop, and anodic coating thickness control. As long as both the manufacturer and the Anodizer are aware of what each is doing, acceptable parts will be produced. For general reference, the dimensional build-up per side of a conventional anodize is about 1/3 of the coating thickness per side. So if a .0006″ is applied, a dimensional change of .0004″can be expected.
