MDD measures the wheel diameter using a three-point measurement. Two of the points being established by fixed rollers, the third point is measured using an inductive position transducer.
The measured diameter can directly be read on the two displays, one on each side. The measuring result can be stored in the memory of the device, together with the running ordinal number and the date. An eight-digit ID number allows the identification of the loco, wagon or car and of the wheel.
The memory has capacity for 1800 measurements. The data transfer from the device to a PC is made through a cable to the PC’s serial port. The data are received in ASCII format and can easily be integrated in Company’ s other programs.
The total measurement range is divided in four subranges, individually designed for each customer. This position is adjusted on the calibration stand using the corresponding calibration piece. MDD is manufactured in two types: MDD-350 for bigger wheels and MDD-315 for smaller ones with the following measuring ranges: MDD-350 between 1255 and 750 mm, MDD-315 between 1050 and 590 mm
The reading accuracy shown on the display is 0.1 mm. The true measurement accuracy is in the range of 0.2 mm, if the wheel is round and has good reference plane and running surface.