The part is usually constrained with a set of V-blocks or a spindle of some sort that will constrain the part while allowing it to rotate. Total Runout is measured by fixing the datum features (typically an axis) and rotating the part along the rotational axis. All points along the surface must fall within this zone when the part is rotated at all times. GD&T Tolerance Zone:Ī 3-Dimensional cylindrical tolerance zone that surrounding a referenced surface that is directly derived from either the datum surface or the axis. Total Runout is usually called on a part that is rotated about an axis where the entire surface is critical to be in spec. Both radial variation and axial variation are measured and held within the tolerance. Total runout controls both the amount of variation in the surface as the part is rotated, but the amount of variation in the axial dimension. ![]() Total Runout is how much one entire feature or surface varies with respect to a datum when the part is rotated 360° around the datum axis. GD&T Symbol: Relative to Datum: Yes MMC or LMC applicable: No Drawing Callout:
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