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When it comes to cylindrical parts, you can choose between a machine that takes radial measurements using a single-point probe (usually a roundness gage) or one that uses contact points for diameter measurement (a diameter gage).

In ongoing efforts to improve efficiency and reduce the CO2 footprint of their fossil fuel engines, engine manufacturers are shaving microns off the tolerances of rotating components such as camshafts and crankshafts.

This post helps clarify some frequently asked questions you may have about parallelism. First, we define parallelism, then we discuss the coordinate system.