Off-Vehicle Procedure

NOTE: Following are two recommended procedures which achieve adequate results using two different off-vehicle drum/disc brake lathes. (If any other lathe is used, follow that lathe's instructions and recommendations.)

AMMCO BRAKE LATHE
- Spindle Speed:
Rough cut, 150 rpm.
Finish cut, 150 rpm.
- Depth of Cut (per side):
Rough cut, 0.1524 - 0.6350 mm (0.006 - 0.025 inches).
Finish cut, 0.1016 - 0.1524 mm (0.004- 0.006 inches).
- Cross Feed (per rev):
Rough cut, 0.254 mm (0.010 inches).
Finish cut, 0.0508 mm (0.002 inches).
- Vibration Damper:
Rough cut - Yes.
Finish cut - Yes.

ACCU*TURN BRAKE LATHE GM DEALER EQUIPMENT (one-cut refinishing procedure)
Locate the deepest score, and turn the rotor micrometer knob until the tool bit bottoms out at the deepest point of the score. Zero the scale and back out the tool bit (repeat for opposite side of rotor). Advance the cutter handwheel until the bits have cleared the inner edge of the rotor face. Adjust the micrometer knobs for about 0.127 mm (0.005 inch) more than the first reading. This will ensure resurfacing the rotor in one cut.
- Spindle Speed: 105 rpm.
- Depth of Cut: As necessary.
- Cross Feed (per rev): 0.0762 mm (0.003 inches).
- Tool Bit Nose Radius: 1/64.
- Vibration Damper: Yes.