Patent ID: 8864552

Claim:
An apparatus for grinding a cam having an outer surface with outwardly convex and outwardly concave portions, the apparatus comprising: a frame; means on the frame for holding the cam and rotating it about a main axis; first and second drive motors having respective output axes generally diametrally flanking the main axis and lying wholly on opposite sides of a plane extending orthogonally through the axis; respective carriages carrying the drive motors and shiftable on the frame radially of the main axis, the first motor being shiftable into an inner position in which the main axis extends through the one drive motor; and respective first and second grinding wheels rotatable by the motors about the respective axes generally at the plane, the wheel of the first motor being of substantially smaller diameter than the wheel of the second motor and also of smaller diameter than the first drive motor, the grinding wheels being, relative to the main axis, axially between the first and second drive motors.