Ranger Products RL-8500, Installation And Operation Manual

Page: 18 / 54

18
STEP 6
(Reconditioning Brake Rotors)
After the following instructions are read and understood,
obtain a scrap rotor for practice. Inspect all rotors carefully
for excessive scoring, rust ridges (at the inner and outer
circumference of the rotor), and blemished hard spots.
Any excessive wear or deformity should be noted. If the
rotor is not within acceptable limits, the rotor should be
replaced.
Always use a micrometer to check the thickness of the
rotor. If the rotor thickness is less than the minimum
established by the manufacturer, or if it will be less after
reconditioning, the rotor should be replaced
Twin Cutters
A micro-dial twin cutter tool assembly is used to
recondition both surfaces of a brake rotor at the same
time. The twin cutter replaces the boring bar on top of
the cross feed after removing the boring bar and tool
holder boring bar brackets.
Practice setting the micro-dial cutters for machining
rotors. Learn all the functions thoroughly to insure proper
operation. Most rotors will have the minimum thickness
values cast into the outer surface.
The proper procedure for determining whether to
resurface rotors or discard them is as follows:
A. Using a micrometer or some other micrometer suitable
for measuring the thickness of the rotor to be machined,
check the rotor thickness at four points (90 degrees apart)
about 1” from the outer diameter.
B. If the thickness at any of the four points is less than
the minimum established by car manufacturers as shown
on the rotor or in a current brake specifications books,
replace the rotor.
C. The rotor may be resurfaced if scored or it has a
small amount of runout, provided it is within the minimum
thickness requirement.
D. After the rotor is machined, measure the thickness
again, and, if it is not within the allowable minimum limits,
discard it. NOTE: This check requires a measurement in
only one spot if both braking surfaces cleaned up 100%,
because the turning operation assures almost absolute
parallelism.
Preparing For Twin Cutter Operations
1. If necessary, remove the boring bar and tool holder
brackets and mount the Twin Cutter as described on Page
11.
2. Move the Spindle to its innermost (right hand) position
by turning the Spindle Feed Hand Wheel clockwise and
then back off by turning dial wheel three turns
counterclockwise. On some deeper rotors it may be
necessary to move the Spindle farther left. For best
results, always position the Spindle as far to the right as
the job will allow.
NOTE:
If the Spindle Feed Hand Wheel does not turn freely,
check to make sure the Spindle Feed Hand Wheel
Lock and Spindle Lock Knobs are loosened.
3. Turn the Cross Feed Hand Wheel counterclockwise
and move the Cross Feed assembly away from the Arbor.
This will make room for the twin cutters after the rotor is
installed. If the Cross Feed Hand Wheel does not turn
freely, check to make sure the Cross Feed Hand Wheel
Lock and Cross Feed Lock Knob is loosened.
IMPORTANT NOTE !
If the Cross Feed Assembly moves too far outward
the feed screw may exit the feed screw nut and
cause the cross feed assembly to become
disengaged from the hand wheel. If this happens,
simply push firmly forward on the RIGHT SIDE of the
Cross Feed Assembly while at the same time
turning the Cross Feed Hand Wheel clockwise until
the feed screw engages the feed screw nut and the
Cross Feed Assembly begins to move.