Reference Information
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Feature Size:
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This is to be measured only in the cut portion of the hole and the cut portion of the outside diameter.
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Shear or Burnished Land:
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This is a burnished area which is approximately one third of the material.
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Break:
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This is an area which is tapered about three degrees.
This area has a rougher surface than the cut area. |
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Roll Over:
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This is a natural consequence of the punching process and the mechanical properties of the material being punched and the die application techniques employed.
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Inside Diameter (I.D.):
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Use plug gauges.
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Outside Diameter (O.D.):
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Use micrometer at shear or burnished land.
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Thickness:
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Use micrometer measurement exclusive of burr.
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Flatness:
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Washer must pass between two parallel surfaces whose distance is equal to the allowable material tolerance plus the allowed flatness tolerance.
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Burr:
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Use a dial indicator as it has a minimum amount of pressure, will not crush the burr, and gives the most accurate reading.
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