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MIL-STD-1452
8 December 1970 K
MILITARY STANDARD
GAGING ,
GENERAL PRINCIPLES
OF
This military standard is mandatory for use by all Departments and Agencies
of the Department of Defense.
PURPOSE:
To provide for operational compatibility of military equipments
through mutually understood and agreed engineering practices relating
to gaging.
SCOPE :
All gaging equipments required by the Department of Defense to
verify compliance of product with design parameters specified in the
relevant product drawing and specification.
REQUIREMENTS:
The principles of gaging described herein shall be adhered
to insofar as practicable:
1. Single feature gages, which verify the maximum material limits of
a Parts will have a unilateral tolerance zone located within the limits of
size of the part and follow the principle:
“that no part will be accepted
which does not lay within the limits of size specified on the drawing.”
2.
Multi-feature gages for checking position, symmetry, etc. should
be so tolerance and dimensioned that they obey the following principle:
“Design sizes and tolerances of features of such gages should be those
which allow the full drawing tolerance to the work piece when the gages
are perfect,
i.e. have no error in size or position.”
3.
Gages which verify the concentricity of a hole in relation to a
thread will have the thread tolerance reversed
for the threaded portion
and the dimension of the non-threaded portion of the gage will be determined
by adjusting the minimum hole diameter by the concentricity tolerance.
4.
Setting pieces for dial indicator gages will be made to a single
nominal dimension and will have a greatly reduced tolerance.
The profile
of these setting pieces will simulate the part.
Dial indicator gages will
not be used for measuring, but as comparators “to eliminate any inaccuracy.
5. Automatic electronic or azr gaging inspection machines will
simulate the contour of the part being gaged.
The master settings for
gaging the uppev and lower limits will have a greatly reduced tolerance.
This tolerance
ill be the nominal plus (+) dimension for “Not
Go” and the
nominal minus (-) dimension for “Go”.
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