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How to Design Metal Stampings
Things We've Learned From Years Making Metal Stampings
19. Measurement and Limits of Flatness
Perfect flatness is that condition which exists when all points on a surface lie in the same plane.Flatness tolerance is the permissible distance between two parallel planes within which all irregularities of a given surface must lie.
Parts may be measured in either unrestrained or restrained conditions. (Recommended limits are applicable to parts measured in the unrestrained condition.)
Bottom surface irregularities are illustrated.
Commonly used flatness tolerances for metal stamping are shown below.
Surface Length Flatness Tolerances From 0" to 1"............................................................0.005"T.I.R.
Over 1" to 4".....................................................0.005"/inch T.I.R.
Over 4"......................0.020"0.004/inch of additional length, T.I.R.
This technical information has been contributed by
Dayton Rogers
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