US3740998A
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Method for calibrating instruments designed to gauge the thickness ofnonmagnetic coatings on metal products and attachment for the realization of this method
Abstract The present invention relates to a method for calibrating instruments designed to gauge the thickness of non-magnetic coatings on ferromagnetic products and an attachment to realize this method. The method and the attachment according to the invention are characterized by the fact that a gauge is calibrated by forming air gaps between an electro-magnet of the gauge being calibrated and an uncoated area of the ferromagnetic product being gauged, imitating the thickness of non-magnetic coatings, readings of the gauge are noted for each setting of the air gap, and the readings are then plotted as a calibration chart of the thickness gauge for a given type of substrate. The method enables thickness gauges to be calibrated without the use of expensive standards.
A method for calibrating instruments designed to gauge the thickness of non-magnetic coatings on ferromagnetic products, consisting in that an electro-magnet of a gauge is set up on an uncoated area of the product being gauged, air gaps are consecutively formed between their mating surfaces to imitate the thickness of non-magnetic coatings, readings of the gauge are noted for each setting of the air gap, and the readings are then plotted as a calibration chart of the thickness gauge for a given substrate of the product.
Claim 2
Independent Claim
86 words
A method for calibrating instruments designed to gauge the thickness of non-magnetic coatings on ferromagnetic products, consisting in that an electro-magnet of a gauge is set up on an uncoated area of the product being gauged, air gaps are consecutively formed between their mating surfaces to imitate the thickness of non-magnetic coatings, readings of the gauge are noted for each setting of the air gap, and the readings are then plotted as a calibration chart of the thickness gauge for a given substrate of the product.
Claim 3
Dependent Claim
56 words
An adjusting element adapted to lift the end of a lever carrying a ponderomotive permanent magnet over the surface of a ferromagnetic product being gauged, said adjusting element being coupled to an indicator serving to register the value of an air gap formed between said ponderomotive permanent magnet and the surface of the product being gauged.
Claim 4
Dependent Claim
56 words
An adjusting element adapted to lift the end of a lever carrying a ponderomotive permanent magnet over the surface of a ferromagnetic product being gauged, said adjusting element being coupled to an indicator serving to register the value of an air gap formed between said ponderomotive permanent magnet and the surface of the product being gauged.