Appreciable portions of one (or both) tails might extend beyond the specified tolerance. With a normal distribution, the tails of measured values may extend well beyond plus and minus three standard deviations from the process average. Measurement error and statistical uncertainty are also present in all measurements. Actual production of any product (or operation of any system) involves some inherent variation of input and output. Experimental investigation is very useful to investigate the effects of tolerances: Design of experiments, formal engineering evaluations, etc.Ī good set of engineering tolerances in a specification, by itself, does not imply that compliance with those tolerances will be achieved. This can be by the use of scientific principles, engineering knowledge, and professional experience. 5 Difference between allowance and toleranceĬonsiderations when setting tolerances Ī primary concern is to determine how wide the tolerances may be without affecting other factors or the outcome of a process.1 Considerations when setting tolerances.
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