Abstract: An apparatus for providing a rotor of an electrical rotating machine in which the apparatus has frame means including a pair of spaced apart support members each having arcuate shaped surfaces engaging opposite shaft ends of a rotor to thereby support the rotor on the frame means. A drive belt has first and second loop ends with the first loop end being positioned around the rotor for driving the latter. Where the rotor includes a commutator, the first loop end may be positioned in engagement with a generally cylindrical surface of the commutator. A drive means, including a pulley around which the second drive belt loop is wrapped, is provided for rotating the rotor to selected winding attachment positions at which winding sections may be attached to the magnetic core of the rotor.