Brake lathe with electronic feed control

Details Brake lathe with electronic feed control Brake lathe with electronic feed control

1994-03-22

1994-09-20

Terrell, William E.

Turning

Portable lathe for brake drum, disc, or shoe

82123, 82134, 388806, 388807, 388815, B23B 502, B23Q 528

Patent

active

053478959

ABSTRACT:
A brake lathe for truing brake rotors includes a tool holder driven by a direct current motor to move a cutting tool radially with respect to the rotor axis in direct proportion to the number of turns of the drive shaft of the direct current motor. A tool feed power control circuit maintains the direct current motor at constant speed regardless of radial forces acting upon the cutting tool and includes a converter/filter circuit, a regulator circuit, a sensing circuit, and a speed control circuit. A speed selection control includes a rheostat for providing a reference voltage corresponding to a select speed. The sensing circuit compares a voltage drop across the direct current motor to the reference voltage and produces an error voltage. The speed control circuit provides a direct current power voltage to the direct current motor in accordance with the error voltage output of the sensing circuit to maintain operation of the motor at constant speed.

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Mark's Standard Handbook for Mechanical Engineers, 9th ed., E. Avallone and Theodore Baumeister III (editors), p. 15-96 Section 15, p. 30, 1st col.

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