But selecting a custom gaging supplier is a tough problem facing many quality professionals. If a part, with five different diameters, is cut on a lathe in one operation with the same tool, all diameters have to be qualified to prove the programming is correct. Once this is done, only the first and last diameters need to be gaged to maintain control. This requires only two custom gages. Discuss gaging requirements with the machine operator.
Operators know what, how, and when to measure.
Even if an application is similar to something that was done before, get feedback from the operator. Operators will know how well the gages work, how often repairs are required, and how process stock interferes with gages. Develop custom gaging specifications. Custom gaging requirements should include gage drawings and specifications. Drawings are used for gage maintenance and product changes.