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A test fixture may be fabricated to test the flatness of parts which have bosses formed on their exterior where the flatness specification calls for a flatness less than the heights of the bosses.
English (United States)
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Electrical Flatness Tester
A test fixture may be fabricated to test the flatness of parts which have
bosses formed on their exterior where the flatness specification calls for a
flatness less than the heights of the bosses.
In the drawing, the part 10 has bosses 12 formed thereon through
conventional forming techniques. To test the flatness of part 10, the bosses may
be supported on electrically isolated and positively charged zones 14. The
remainder of the test fixture, such as in region l6, may be negatively biased. In
the event that the part 10 is not flat to the required dimensions and a portion of
the part makes contact with region 16 of the test fixture, a current flow through
part 10 will result and will thus be detectable to indicate that the part is not within
the required flatness specification.
Should the part be placed on the fixture with no discharge between the two
regions 14 and 16, then the part will have passed the test.
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