Pro-Cut PFM 9.2 - Manual (Page 16)

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The cutting tips must be right-side up. Dots face up. The cutting tips should not have chips or dings in the
surface of the points. Do not take cuts of less than 5 thousandths of an inch / 0.13mm unless necessary for
nonvented, drilled, or rear of dual wheel trucks. Cuts of 5 to 10 thousandths / 0.13-0.25mm will provide the best
surface finish and the longest tip life for for vented rotors of normal size.
CHECK CUTTING TIPS
On each brake job, the technician must center the cutting head. Once the head is centered, it is vital that the
technician tighten the cutting head lateral lock knob securely. Failure to do this may result in chatter.
MAKE SURE THE CUTTING HEAD IS SNUG
The chip deflector included with the lathe is a critical component. The pressure of its
pads provides a great deal of dampening that reduces the chance of vibration while
cutting. The chip deflector must be used on every cut to ensure proper finish. New
chip deflectors can be purchased directly from Pro-Cut. For thin, solid rotors a heavy-
duty chip deflector/silencer
(50-754) is available.
USE THE CHIP DEFLECTOR
CHECK FOR BENT TOOL HOLDER PLATE
Check the tool holder plate for damage. Slide a 0.003" / 0.08mm feeler gauge between the tool holder plate
(50-293) and the tool arms. If it can be inserted freely your tool holder plate is damaged. A damaged tool holder
plate will often cause a vibration during the cut. This will leave a poor surface finish on the rotor.
The chip deflector reduces vibration
and must be used on
EVERY cut.
Lubricate the cut depth adjustment wedge threads with a thin coat of light machine oil.
Check the slide plate (50-496) for lateral play. Lateral play often causes ridges and machining grooves when a rotor is re-
surfaced. To check for lateral play, grab the slide plate assembly and try to wiggle it side to side. If there is motion, you will
need to tighten the Gib (See “Tightening the Gib” on Page 32).
Brake performance is dependent upon rotor surface finish as well as minimizing lateral run-out. The
Pro-Cut lathe is designed to give you a superior surface finish on any rotor as long as proper maintenance
is followed.
Minimizing vibration during machining is the key to high-quality surface finish. It is critical that all con-
tact points between the rotor and the lathe are secure – specifically, the connections between lathe and
adapter; the slide plate and the lathe; the cutting head and the plate; and the tips and the tool holders.
Looseness in any of these areas will compromise lathe performance and surface finish.
WEEKLY MAINTENANCE TROUBLESHOOTING
TROUBLESHOOTING ASSURING A SMOOTH FINISH
The Pro-Cut 9.2DRO should
provide a smooth surface
finish on every cut, free of
chatter, tone, or roughness.
If your machine leaves a sub-
standard, “chattery” or rough
finish, you need to find the
problem. The following pages
are the common sources of
poor surface finish and ways
to remedy the problem.
NOTE