This paper discusses some of the different ways to define a rotor profile for measurement evaluation. The definition of a rotor profile has traditionally been influenced by gear machining and gear checking terminology instead of geometric tolerance schemes and coordinate measurement machines (CMMs). By taking CMM measurement into consideration when defining the profile, the total tolerance consumed by measurement repeatability and reproducibility can be minimized. To accomplish this, geometric tolerance schemes regarding profile of a line and profile of a surface are discussed. Examples of identification points for profile definition and profile tolerance zone are also included. A case study of gage repeatability and reproducibility is also shown which demonstrates the successful application and validity of the concepts presented within.
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