Jet engines, power generators and other large parts present a challenge when measuring diameter because of their size. Bar gages and periphery tapes are two ways to measure the part. A third way is a product that counts the revolutions of a wheel as it rolls across the outside or inside diameter of a large part.
The product is the MIC 360 diameter gage from Gagemaker Inc. (Houston). The in-process measurement tool works on grinders and lathes and mounts on the machine's tool changer with a standard 11/4 inch shank or a custom quick-change tool shank. It measures diameters as small as 4 inches, but it is better suited for measuring larger diameters, said John Wolfe, Gagemaker's vice president of special projects.