Temperature compensated quantitative dimensional measurement device with programmable in-tolerance/out-of-tolerance indications

Abstract From the Canadian patent

A computerized gauge measures dimensions typically in the range of 6.1865" to 6.1917" accurate to ? .001", typically the diameter of a steel railroad car axle. It indicates the in-tolerance/out-oftolerance condition of each measurement as well as the quantitative measurement value. The gauge simultaneously senses the temperature, typically within a range of -20°F to 100°F ?1°F, of the axle workpiece. In consideration of the predetermined coefficient of expansion of the workpiece, the gauge calculates the dimension that the workpiece would exhibit should it be thermally brought to a predetermined, 59°F by convention, reference temperature. From the workpiecetemperature-compensated dimension …