Abstract: The invention relates to a method for non-contact measurement of the alignment of the wheels of a motor vehicle. In practice, the method provides for the steps of: applying a plurality of markers to the wheels of the motor vehicle along a line approximately substantially coaxial with the wheel; positioning, at each wheel for which the characteristic angles must be acquired, two image acquisition devices, with different inclinations with respect to said wheel; acquiring for each of said wheels, through each of said two image acquisition devices, at least one image of said wheel with the relative markers; determining, through epipolar and triangulation geometrical calculations, the equation of an approximate plane in which said markers lie in space, with respect to a reference system; determining the camber and toe angles of said wheel on the basis of the equation of said plane and of the equation of the reference planes with respect to which the motor vehicle takes a known position.

Abstract: The invention relates to a method for non-contact measurement of the alignment of the wheels of a motor vehicle. In practice, the method provides for the steps of: applying a plurality of markers to the wheels of the motor vehicle along a line approximately substantially coaxial with the wheel; positioning, at each wheel for which the characteristic angles must be acquired, two image acquisition devices, with different inclinations with respect to said wheel; acquiring for each of said wheels, through each of said two image acquisition devices, at least one image of said wheel with the relative markers; determining, through epipolar and triangulation geometrical calculations, the equation of an approximate plane in which said markers lie in space, with respect to a reference system; determining the camber and toe angles of said wheel on the basis of the equation of said plane and of the equation of the reference planes with respect to which the motor vehicle takes a known position.

Abstract: Wheel balancing apparatus includes a shaft for rotating the wheel. Sensing devices are provided on spaced bearings for the shaft to obtain dynamic and positional data concerning the imbalance of the rotating wheel. A feeler arm is mounted so as to be angularly and axially slidably movable about and along an axis parallel to the wheel axis, in such a manner that contact means on the arm are brought successively into contact with opposite edges of the wheel disc. Potentiometers are associated with the arm to sense its axial and angular position when the contact means are in contact with the wheel edges. The radius and thickness of the wheel can then be derived from these positions.