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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. Fabricast's engineers will specify the best brush grade for both Fabricast built slip rings and for customer applications. Custom brush assemblies and brush grades can be designed and manufactured for your specific application.

BRUSH CONTACT MATERIAL

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

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.

LEAF TYPE BRUSH ASSEMBLIES

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.

For more information, Please contact Fabricast directly at (800) 649-9930