Abstract: A mechanism for lifting a wheel set, such as a railroad wheel set, is constructed for cooperation especially with wheel truing machines for lifting a wheel set into a machining position or out of the machining position. In order to facilitate the chip removal, the lifting mechanism is tiltably mounted in a chip removal pit. In its uplifting working position a cover of the lifting mechanism substantially closes the chip pit except for the wheel carriers. In the recessed position of the lifting mechanism the cover tilts along with the lifting mechanism thereby guiding any chips accumulated on the cover onto a chip removing conveyor in the pit. For this purpose the lifting mechanism has a movable frame hinged to a stationary frame so that the hinging axis extends outside of a lifting plane passing through the rotational axis of the wheel set.

Abstract: A method and apparatus measure or gage worn railroad wheel profiles for the purposes of ascertaining the location of the new profile relative to the worn profile. The new profile is to be produced by a reprofiling operation such as a truing. For this purpose characteristic points on the worn profile are contacted in a radial and axial direction by a sensor and the respective displacement of the sensor is measured or gaged relative to a zero or null point. The location of the sensed points is then compared in a computer with a given reference location on a corrected profile. The corrected profile is then contacted with the sensed or gaged point which will make it possible to restore a correct profile with the least possible material removal in a milling or machining operation.