Ammco On-Car Brake Lathe Operating Guidelines
ClassificationBR92-001
Models:
All models
Date:
August 14, 1992
Section:
Brake
Reference
TECHNICAL BULLETIN ITB92-043
AMMCO ON-CAR BRAKE LATHE OPERATING GUIDELINES
APPLIED MODEL:
All models
SERVICE INFORMATION
To ensure the best possible surface finish and least amount of run-out and rotor thickness variation when using the Ammco on-car brake lathe, the following guidelines should be observed.
SERVICE PROCEDURE
Before mounting the brake lathe on the vehicle ensure the following:
1. The V-way between the carriage and carriage gib must be clean and adjusted properly (see Operation Manual for adjustment procedure). Wipe off sliding surfaces with a soft cloth after each use.
2. The cutters and cutting bits must be tight in their mounts and positioned properly. Change cutting bits when they become dull.
3. When securing the adjustable mounting brackets to the caliper mount/knuckle, the mounting surfaces must be smooth and free of burrs.
4. Make sure die adjustable mounting brackets are securely mounted to caliper mount/knuckle. There should be no movement between the cutting tool and the caliper mount/knuckle.
Rotor Driving Unit Before using the drive unit ensure the following:
1. Before using the rotor driving unit, ensure that all lug nuts are installed on the lugs (including the lugs not used for the lug adaptor). All lug nuts should be evenly torqued, to at least 40 ft.lbs. Do not over-tighten the lug nuts as damage may occur to the lug adaptor legs.
2. To prevent chatter and ensure a smooth rotor finish, install the largest and heaviest silencer band possible around the outside diameter of the rotor.
3. Do not use the machine with the wrong rotation direction. The direction of rotation must be into the top of the cutting bits.
Rotor Cutting Before engaging the cutting tool, ensure the following:
1. Using the dial indicator, measure rotor/hub run-out prior to resurfacing rotor and adjust cutting depth to eliminate this run-out. Each cut may be between 0.05 mm and 0.25 mm (0.002" and 0.010"). Additional cuts may be necessary to eliminate all die run-out.
2. Using a micrometer, measure rotor thickness in at least 8 even locations around the rotor. Do not cut below the minimum rotor thickness specification. Replace rotor if the run-out cannot be eliminated without exceeding the minimum rotor thickness specification.
3. After rotor resurfacing is completed, measure the rotor/hub run-out using a dial indicator. Ensure that the run-out is below the specification for the vehicle. If runout is not within specifications, turn the rotors again. Properly machined rotors will have almost zero runout (.001" or less) with no measurable thickness variation.
4. Do not smooth the rotor surface with sand paper or other abrasive material.