Brush Assemblies
INTRODUCTION
Fabricast offers a complete line of silver graphite leaf and plunger
brushes. These assemblies can be used to replace worn brushes on Fabricast
slip rings or for other applications on which the customer feels they
would be applicable. Our engineers will specify the best brush grade
for both Fabricast built slip rings and for customer applications.
The following chart gives some basic information on the most common brush
contact materials.
| Brush
Contact Material Chart |
| Grade Number |
Composition |
Recommended
Surface Speed |
Carrying
Capacity |
| FAG 180 |
80% Silver
20% Graphite |
Up to 3500
feet per minute |
250 amps per
square inch |
| FAG 180A |
80% Silver
20% Graphite
plus MoS2 |
Up to 3500
feet per minute |
250 amps per
square inch |
| FAG 150 |
50% Silver
50% Graphite |
Up to 6000
feet per minute |
100 amps per
square inch |
| FAG 150A |
50% Silver
50% Graphite
plus MoS2 |
Up to 6000
feet per minute |
100 amps per
square inch |
| FAG 193 |
93% Silver
7% Graphite |
Up to 250
feet per minute |
300 amps per
square inch |
Fabricast grade FAG180 is the low noise level grade used for all standard assemblies. In general, a noise level of approximately 1 microvolt for each milliampere of current flow can be accomplished depending on the speed of the unit and quantity of brushes per ring.
Fabricast grade FAG150 is the highest
surface speed grade: however, noise levels are slightly higher than
FAG180. Brush life is approximately twice that of FAG180. It is recommended
when brush life is critical and/or surface speed is high. Low noise
can be achieved with multiple contacts per ring.
Fabricast grade FAG193 has highest current
carrying capacity; however, it is limited to a surface speed of 250
ft. per minute.
Fabricast grades FAG180A and FAG150A
contain molybdenum disulfide in addition to silver and graphite. This
additive is required for operation in altitude, vacuum, and inert environments.
Other characteristics remain the same.
Plunger type brush assemblies consist of
a brass holder with cap, a copper or BeCu buss assembly, and a spring
loaded silver graphite plunger brush. Both holder and buss are tin plated.
Brush holders are most commonly press fit into a dielectric brush block
or soldered/brazed to a buss which is then bolted to the brush block.
The following chart shows the different
plunger brush part numbers for specific brush sizes and brush grades.
| Plunger
Brush Part Number Chart |
| Brush
Size |
Brush
Grade |
|
FAG
180 |
FAG
150 |
FAG
180A |
FAG
150A |
FAG
193 |
| 3/32" Square |
1072-1 |
1072-5 |
1072-11 |
1072-10 |
1072-14 |
| 1/8" Square |
1072-2 |
1072-6 |
1072-13 |
1072-12 |
1072-15 |
| 3/16" x 1/4" |
1913-1 |
1913-2 |
1913-3 |
1913-4 |
1913-5 |
| *1/4" x 1/2" |
1092003 |
1092003-31 |
1092003-29 |
1092003-27 |
1092003-25 |
| **1/4" x
1/2" |
1991-1 |
1991-2 |
1991-3 |
1991-4 |
1991-5 |
* For use with brush holder P/N 1092006
** For use with brush holder P/N 1092012
For complete information on the different
plunger brushes and holders available please download relevant
catalog pages or request a Fabricast catalog by phone, Email, or
by completing the Request For More Information
Form.
For complete information on the different leaf
brushes available please download relevant catalog
pages or request a Fabricast catalog by phone, Email, or by completing
the Request For More Information
Form.
Fabricast, Inc.
2517 Seaman Avenue
P.O. Box 3176
South El Monte, CA 91733-0176
Phone: 626-443-3247 Fax: 626-443-5594 Email: info@fabricast.com
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