Much design, machining and measurement effort has been directed towards the rotors themselves, in a screw compressor (helical lobed compressor). This paper deals with another important feature of the screw compressor - the axial discharge port. Geometric tolerancing of the discharge port is discussed. The discharge port was modeled on a CAD system. The CAD data was transferred into a CMM (Coordinate Measurement Machine) with scanning capabilities. The measurement data was collected and the actual discharge port profile was reconstructed using the CMM software. Comparison was made with the nominal profile by visualizing each segments' deviation, taking the datums into account. Gauge repeatability and reproducibility were discussed, as well as profile form machine settings.
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