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DIMENSIONAL
DATA |
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2329A |
3034A |
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Diameter |
29" |
34" |
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Thickness |
1" |
1" |
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A. Length
thru Bore |
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5.0 |
5.0 |
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5.5 |
5.5 |
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6.0 |
6.0 |
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6.75 |
6.75 |
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- |
7.25 |
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- |
9.25 |
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B. Bore |
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4.25 |
4.25 |
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4.625 |
4.625 |
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5.0 |
5.0 |
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5.875 |
5.875 |
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- |
6.25 |
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7.0 |
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D.
Centerline
Distance |
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8.25 |
10.25 |
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8.25 |
10.25 |
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8.75 |
10.25 |
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9.75 |
10.25 |
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9.75 |
10.75 |
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9.75 |
10.75 |
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CDB-A balanced
brakes have dual
calipers. Each
operates as follows: |
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|
 CDB-A
brakes are spring
applied and
electrically
released. When power
is turned off the
torque spring
assembly pushes the
armature away from
the magnet body (#1)
which in turn forces
the caliper arms
out.
The caliper arms
(#2) articulate
about the sealed and
lubricated pivot
points (#3) forcing
the pusher plates
(#4) to press on the
friction pucks (#5).
The friction pucks
are held in machined
pockets in the
base's tower (#6).
As the pressure
plates exert a
squeezing force, the
pucks pinch the disc
(#7). The resulting
torque reaction load
is directly
transmitted from the
pucks to the tower
that is welded to
the base (#8).
The caliper arms do
not carry the torque
reaction load. This
allows them to
easily accommodate
the axial movement
of the DC motor.
When power is
applied to the coil,
the armature is
attracted towards
the magnet body thus
collapsing the
spring. This allows
the caliper arms to
open thereby
removing the
squeezing force on
the pucks. In this
state, the friction
pucks account for
negligible drag.
The disc has far
greater exposed
swept area than a
drum thus its energy
dissipation
capability is far
superior to a drum.
This allows the
brake to operate
cooler and avoid
fade problems.
Discs are far less
susceptible to heat
checking because
they absorb energy
from both sides,
therefore avoiding
high thermal
stresses common in
brake drums. |
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WHEN CONVERTING |
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CDB-A brakes
directly replace
drum brakes. They
have the same
mounting footprint
and torque capacity
as drum brakes. When
converting, it is
critical that the
disc's centerline is
in the same position
as the drum's
centerline. (see
sketch)
If the installation
conforms to AISE's
dimensional standard
for DC mill motors,
then when ordering
all that is required
is the DC mill motor
number. In all other
installations,
please provide a
drawing of the
existing brake
wheel. |
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APPLICATION
ASSISTANCE |
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 PT Tech has been
analyzing and
solving shockload
problems for heavy
industry since 1980.
Our application
engineers regularly
visit mills to
better appreciate
the problems that
plant engineers and
maintenance people
face when trying to
solve a shockload
problem.
In addition, PT
Tech's application
engineers have two
unique tools to
assist you. First,
our test stands can
simulate the inertia
shockload up to that
of a #820 DC mill
motor in the attempt
to better understand
how a torque limiter
will perform in your
application.
Second, using
thousands of test
results, PT Tech has
developed a
computerized
selection program
that quickly
determines the best
solution to your
shockload problem. |
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FIELD SERVICE |
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|
 The
people at PT Tech
who build our disc
brakes also go into
the field to service
them when needed. PT
Tech supports its
commitment to
excellent field
service with a large
inventory of parts
and a 24-hour
emergency service
hotline.
If you need us call
800-717-4358. |
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