AMMCO 7700 Drum and Disc Brake lathe - Manual (Page 14)

10 • AMMCO Drum & Disc Brake Lathes
Set Up and Reconditioning Rotors
1. Install a silencer band on the mounted rotor.
Stretch the band around the rotor and hook the metal
loop over a lead weight.
Figure 21 – Attach silencer band
Always wear safety glasses or a face shield. Cutting
or grinding on an exposed surface such as a rotor
will produce flying chips and debris.
Hazard Areas must be protected during lathe opera-
tion. Keep shields and guards in place. Keep fingers
out of these areas and away from rotating parts.
2. Center the twin cutter to the rotor. Loosen the
stud nut and adjust the twin cutter so that the rotor is
centered between the tool bits. The slot of the twin
cutter should be approximately parallel to the lathe
spindle. Tighten the stud nut firmly.
Figure 22 – Center the twin cutter
3. Install the safety shield. Review the cautions and
dangers section and the general safety information at
the beginning of this manual. The safety shield is eas-
ily screwed onto the twin cutter in the threaded mount-
ing hole provided.
Figure 23 – Attach the safety shield
4. Adjust the drive belt to match the rotor size. Use
the outer pulley groove for passenger car and most
light duty truck rotors. Choose one of the inner pulley
grooves when machining medium duty and larger truck
rotors and some solid rotors.
Figure 24 – Adjust drive belt location
5. Make sure that the tool bits clear the rotor sur-
faces and the silencer band. Give the rotor a full turn by
hand and watch for clearance all the way around.
6. Turn the lathe ON.
7. Turn each tool bit control (the outer knurled knobs)
clockwise until the tool bits just contact the rotor surfaces.
8. When the tool bits make contact, rotate each of
the inner depth-of-cut collars to zero and back the tool
bits away from the rotor.
From this point on, all tool adjustments will be made
with the tool bit controls. Then inner depth-of-cut col-
lars will be the reference and should not be moved.
Figure 25 – Tool bit controls
WARNING
Silencer band
Twin cutter
Stud nut
Tool bits
Safety shield
Twin cutter
V-belt in outer pul-
ley groove
Inner depth-of-
cut collars
Tool bit controls
Hold knob with one hand
– turn collar
Each increment =
0.002” english,
0.05 mm metric