Magnetic coating thickness comparator having parallel magnetic rods with nonmagnetic slide indicators
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United States of America Patent
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Feb 21, 1984
Issued Date -
N/A
app pub date -
Jul 7, 1983
filing date -
Nov 12, 1981
priority date (Note) -
Expired
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Abstract
A coating thickness and surface comparator for measuring the thickness of nonmagnetic coatings (28) or roughness on ferromagnetic base materials. A permanent rod magnet (6) and a ferromagnetic rod (16) are supported by nonmagnetic slides (12, 14) parallel to one another. When a standard base (24) is placed at one end (22) of the rod magnet (6) and a coated or roughened base (30) is placed at the other end, the slides (12, 14) are pushed together toward the middle of the rod magnet (6). The coincidence of the slides (12, 14) varies from the middle of the bar magnet (6) in proportion to coating thickness (28) or roughness.
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