The continuous control of wear of wheel diameters can result in
considerable savings in material. As known, the smallest wheel
wears the fastest, which produces an accelerated rate of wear. With
a well-programmed control of diameters such a growth of wear can
be detected and remedied at an early stage.
Further, if the wheels of a bogie are of different size, there is always the risk that the wrong position of the bogie starts to increase the growth of flange wear and thus shortens wheel lives. This unnecessary wear can be avoided by a well programmed control.
Wheel diameters can be measured quickly and reliably with
1M-350 / 1M-315 (download PDF-file) diameter measuring devices. This instrument fits in surprisingly small places and normally there is no need to remove any parts of the train, when you use this device. This means that as soon as a train arrives at the depot, the wheel diameters can be measured. Should it be necessary to replace one of the wheelsets, you can rapidly measure the diameters of the wheelsets remaining under the train and search among the wheelsets available for the one where the diameters are the closest possible to those wheelsets remaining in service. Thus the need for cut in reprofiling will be a minimum possible and the time the train spends at the depot will shorten significantly.
The diameter measuring devices 1M-350 and 1M-315 measure the diameter with an accuracy of 0.2 mm. The device is operated with chargeable, removable batteries. The whole device weights under 2 kg. It has two five-digit displays, thus the readings can be read on either side of the device. By moving the device along the wheel profile and observing the display readings, you can study the unroudness of the wheel.
These diameter measuring devices have been manufactured long over ten years and they are in use all over the world, including all the railway and metro depots in Finland.