12 • Snap-on
Brake Lathes
A
C
B
E
H
D
F
I
G
Hubless Brake Drums
A
C
B
L
K
D
F
Hubbed Brake Drums
Hubbed Brake Drums
— Tapered cone adapters fit
in the bearing seats, making contact near the middle
of the bearing race whenever possible rather than near
an edge. Various adapters and spacers may be used to
fill out the shaft of the arbor.
Hubless Brake Drums
— A cone fits into the center
hole of the drum from the inside to center the drum on
the arbor. Select a hubless adapter which will fit inside
the drum, against the flat lug hole surface and either
straddle the boltholes to avoid mounting against a burr,
or remove the burrs. Slip the hubless adapter onto the
arbor followed by a spring, the cone, the drum, and
another hubless adapter. Fill out the shaft with spacers
as needed.
Key to Mounting Adapters, Cones, and Related Parts
A.
1” Arbor
B.
Flange Plate
C.
Spring
D.
Centering Cone
E.
Rotor, Drum or Flywheel
F
. Flange Plate
G.
Spacer(s)
H.
Self-Aligning Spacer
I.
Arbor Nut
Note:
The self-aligning spacer should always be used
next to the arbor nut when tightening. To avoid over-
tightening, wrench tighten the arbor nut counterclock-
wise until the drum and adapters begin to turn on the
arbor, then continue to advance the wrench 1/16 of a
turn. DO NOT overtighten the arbor nut.
Typical Drum Mounting Configurations
