16 • Snap-on
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 17 – Attach silencer band
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 18 – 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
mounting hole provided.
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.
Figure 19 – 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 20 – 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 sur-
faces.
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.
WARNING
Silencer band
Twin cutter
Stud nut
Tool bits
V-belt in outer pul-
ley groove
