Abstract
Position tolerance is used in geometric dimensioning and tolerancing to specify tolerances for the location of holes. The tolerance zone for holes is usually cylindrical and the allowable position tolerance is the diameter of the tolerance zone. If holes are used in flat parts, as e. g. sheet metals, it is sufficient to use circular tolerance zones. In order to assure the quality and to reduce the risk to accept products which do not fulfil the design requirements, statistical process control is used in industry. In this paper it is shown, how process capability indices and the associated risk can be calculated for circular position tolerance zones.
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