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