On-car disc brake lathe

A disc brake lathe for machining a brake disc of a vehicle without removing the brake disc from the vehicle but only the wheel and other parts of the brake mechanism, said disc brake lathe comprising:

• a power drive unit for rotating a brake disc on the vehicle;
• and
• a lathe head having at least one cutting tool for machining the brake disc while the brake disc on the vehicle is rotated by said power drive unit, said lathe head being adapted to be mounted on the vehicle for machining the brake disc on the vehicle and said lathe head including a reversible, low voltage DC electric motor for power feeding of said at least one cutting tool during machining in each of two opposite directions depending upon the direction of operation of said reversible motor and means for adjusting the frequency of vibration of the lathe head during machining so that the amplifying effects of resonance can be avoided and wherein said two opposite directions of power feeding of said at least one cutting tool are an infeed direction where said at least one cutting tool moves toward the center of a brake disc being machined, and an outfeed direction where said at least one cutting tool moves toward an outer rim of said brake disc being machined, and wherein said lathe head further comprises first stop means for automatically stopping the power feeding of said at least one cutting tool in said outfeed direction at a predetermined position, second stop means for automatically stopping the power feeding of said at least one cutting tool in said infeed direction at a predetermined position, and means for adjusting the location of said predetermined position at which the power feeding of said at least one cutting tool in the infeed direction is stopped.

A disc brake lathe for machining a brake disc of a vehicle while the brake disc is either on or off the vehicle, said lathe comprising, in combination:

• a first part drive unit for rotating a brake disc on a vehicle;
• a second, bench mounted power drive unit for rotating a brake disc off the vehicle;
• and
• a lathe head having at least one cutting tool for machining the brake disc while the brake disc is rotated by a selected one of said first power drive unit and said second, bench mounted power drive unit, said lathe head being adapted to be mounted on the vehicle for machining the brake disc on the vehicle, and said lathe head including a reversible, low voltage DC electric motor for power feeding of said at least one cutting tool during machining in each of two opposite directions depending upon the direction of operation of said reversible motor, wherein at least one fastener is provided for attaching said lathe head to said second bench mounted power drive unit to permit machining of a brake disc off the vehicle, wherein said two opposite directions of power feeding of said at least one cutting tool are an infeed direction where said at least one cutting tool moves toward the center of a brake disc being machined, and an outfeed direction where said at least one cutting tool moves toward an outer rim of said brake disc being machined, and wherein said lathe head further comprises first stop means for automatically stopping the power feeding of said at least one cutting tool in said outfeed direction at a predetermined position, second stop means for automatically stopping the power feeding of said at least one cutting tool in said infeed direction at a predetermined position, and means for adjusting the location of said predetermined position at which the power feeding of said at least one cutting tool in the infeed direction is stopped.