Figure A-8. Method of gauging worn flange wheel

Figure A-8. Method of gauging worn flange wheel.

The pointer indicates amount of metal in sixteenths of an inch to be turned off tread to restore full

flange contour with a witness groove. The side scale shows amount of metal on tread above

measuring line before turning. In this illustration, 7/16 must be turned off tread to restore full

flange contour. The amount of service metal available after turning is 6/16 inch.

The gauge may be equipped with one or both of two movable fingers having different calibrations.

A finger marked "NF" or a finger having no identifying marking is used for gauging flanges of

steel wheels used on freight cars, passenger cars and locomotives. The "WF" finger may be used

when restoring wide flange contour to wheels.

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