When flattening for your metal stamping project, first need perfect flatness - that condition which exists when all points on a surface lie in the same plane. In order to achieve perfect flatness, you first need to know the flatness tolerance for the surface you’re working with.
What is Flatness Tolerance?
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.)
Flatness Tolerances for Metal Stamping
Commonly used flatness tolerances for metal stamping, laser and turret are shown below.
|Surface Length||Flatness Tolerances|
|From 0” to 1”||.005 T.I.R.|
|Over 1” to 4”||.005/inch T.I.R.|
|Over 4”||020+ .004/inch of additional length, T.I.R.|
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