Pro-Cut PFM 9.2 - Manual (Page 13)

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MACHINING ROTORS
Step 4: MAKE THE CUT (4 Minutes)
With the motor still running, loosen the forward lock lever on the cutting head to allow cutting depth
adjustment. 1. Now that you have adjusted for depth, tighten the forward lock lever (over the tool arms). This lever must
be tight to minimize vibration.
For safety, it is advised at this time that you turn the motor off. Place the
chip deflector/silencer around the rotor and over the cutting tips. Grooves in the chip deflector/silencer
will fit snugly over the cutting tip screw heads when installed correctly. This silencer is very important,
and it should be used on every rotor. There are currently two types of chip deflector/silencers. The first,
the 50-703 standard version, is used in most applications. The second, the 50-754, has double thick
silencer blocks and a lock clip to increase pressure on the rotor. The 50-754 chip deflector/silencer works
well on the thin solid rear rotors In 2012 Pro-Cut will introduce a third type, which has wide pads and a
wider wire loop which will make this type function better on thicker rotors.
Once cut depth is set, tool arms are locked down, and silencer is secure, you may turn the motor back on.
Press the feed engagement knob to engage the automatic feed. Provided that you previously set the shut-
off cam correctly, the lathe will shut off when the cut is complete. The cut will take two to four minutes
depending on the size of the rotor.
It is extremely important
not to touch the hat of the
rotor with the outer tool
holder. This will damage
or break the tool holder
plate. This type of dam-
age is
NOT COVERED BY
THE WARRANTY.
WARNING
Step 4: MAKE THE CUT (4 Minutes) CONTINUED
6.
7.
MACHINING ROTORS
Pictured above is the
50-754, which has
double thick silencer
heads and a lock clip
to increase pressure on
the rotor.
Turn cut-depth knobs counter-clockwise until the tips can clear both sides of the rotor. Crank the cutting
head in to the middle of the braking surface of the rotor.
Start with the inside (behind the rotor) tool arm. Turn the depth knob clockwise (tighten) until the tool tip
just barely makes contact (scratches) with the rotor surface. You can listen for the contact. Next move
the outside tool arm in until it also makes contact.
Now advance the cutting head in towards the center of the rotor making a "running light scratch". If there
is a large ridge on the outer edge of the rotor, you may remove that as well by manually feeding the cutting
head slowly over that ridge. Be careful not to crank the cutting arms into the “hat” of the rotor.
Damage
caused by advancing the cutting arm into the hat of the rotor is not covered by warranty.
When you are at the inside edge of the pad contact surface, you may adjust for depth by turning the depth
knobs clockwise. Each line of the knob represents cutting tip movement of 0.0025” / 0.064mm. Cut
at least 0.005” / 0.13mm (or two lines) on each side with each pass. The maximum depth is 0.020” /
0.51mm per side, per pass. The exceptions to this rule would be extremely large and thick rotors such
as on a Medium Duty truck like the Ford F550 or larger, or very thin solid rotors such as on the rear of a
Cadillac DeVille. In these applications, the depth rule is reversed and the minimum cut can be reduced to
0.0025” / 0.13mm per side per pass, and the maximum cut depth should be limited to 0.005” per side
per pass. Other specialty rotors, such as cross-drilled or slotted, may also require a reduced cut depth.
Note: see our web site for tech-tips on cutting larger and specialty rotors.
2.
3.
4.
5.
Turn the dials clockwise to advance the
cutting tip depth. Each line on the dial
indicates 0.0025” The chip deflector rides over the cutting
arms as shown above. The chip deflec-
tor should be used every time.
Guard
not shown for clarity.
Move the cutting head by turning the knob
shown above, clockwise for away from
the rotor, counter-clockwise for towards
the rotor.