However, potential problems can arise if the datum feature is specified with material modifiers. A part can pass even if its local zones are off the center, as long as the axis is within tolerance. Ī- Position Tolerance: This is the least limiting coaxiality type. For more information, refer to the ASME standard and other related reference articles. This post proposes brief and practical definitions regarding which type of tolerance to choose for certain applications as well as the advantages and disadvantages to each. There are four different types of tolerances for defining coaxiality controls: Position, concentricity, circular runout and total runout. Coaxiality conditions can be vital for shafts supporting heavy and varying loads, such as car and truck axles, electric motors, generators and pumps.
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