Abstract: The diameter of railroad wheels is calculated from data obtained by simultaneously producing two marker points on the tread surface of the wheel and simultaneously sensing these marker points and from data representing the known fixed location of the marker point generators and of the sensors. These data define a chord line and a chord height subtending the chord line. The length of the chord line and chord height in turn define the wheel diameter. A computer performs the calculations and provides a respective output that may be used for display or for controlling a tool such as a wheel truing machine.

Abstract: A combined tool for precision boring and burnishing a tubular workpiece includes a bore head and a burnishing head which are advanced by a feed tube into the interior of the tubular workpiece while the latter is rotated about its axis. In order to reduce the stresses on the three above-mentioned elements and to avoid markings on the finished surface, two of the three elements are connected by a coupling, which while transmitting torque between the two connected elements, permits limited deviations of the axes thereof.