Method for radially aligning wheelsets of rail vehicles

A method for radially aligning wheelsets of rail vehicles relative to a coordinate system of a wheelset diagnosis tool and/or wheelset machine tool, wherein one wheelset comprises two wheels which are arranged on a common axis with their wheel backs pointing to one another, characterized by the following steps:

• a) positioning of the wheelset at a working position of the tool;
• b) defining a tool-side coordinate system in an assumed wheel centre point of each wheel, wherein an X-axis adopts a vertical extent, a Y-axis adopts a horizontal extent and a Z-axis describes the resulting depth extent of the wheel;
• c) measuring the distance of the wheel backs with respect to one another and defining the Z-position=0 on the respective wheel back;
• d) defining a unique Z-position for measuring points Za and Zb of the two wheels at a distance from the Z positions=0, whereby the measuring points Za and Zb are located at the same Z position of the coordinate systems of the two wheels and at respective zero points of the X axis relative to a machine axis as at least a virtual axis in the area of the wheel centre;
• e) positioning one measuring sensor at the each specified Z-position of the measuring points Za and Zb;
• f) measuring the X-positions for the Z-positions of the measuring points Za and Zb;
• g) determining a difference ΔX from the X positions for the Z positions of the measuring points Za and Zb;
• and
• h) aligning the wheelset by vertically displacing one of the wheels in order to align the X-positions of the measuring points Za and Zb of the two wheels, where ΔX=0.