IN BRIEF: Brakes and clutches

Electroid's XT Series spring-set, power-off brakes offer triple the torque in a package one third the size of a standard brake, says the company. A novel friction material--which has been tested to aerospace specifications including shock and vibration, extreme vacuums, and cold temperatures--has a coefficient of friction between 0.75 and 0.95 depending on pressures and unit size.

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Nexen's new Eclipse servo brake works by exceeding the continuous stall torque of the servomotor, safely holding a load larger than the motor can move. The spring-engaged unit, which features a universal flange for compatibility with a wide variety of motors and gearboxes, produces no brake-to-shaft backlash, preventing tolerance problems of machine components moving out of position during braking. Output torque ranges from 3.5 Nm at 10,000 rpm to 50 Nm at 3,500 rpm.

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Bonfiglioli North American BNA has introduced a series of clutch brakes that are compact-sized, totally enclosed units for frequent clutch and braking cycles. The units are designed to compensate for increases in air gap due to wear, thus eliminating the need for ongoing maintenance and adjustment. Torque ranges from 66 to 665 lb-inch.

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Warner Electric's new Euroline clutches and brakes are metric-sized to accommodate customers whose European-made equipment requires "hard" metric sizing. The components are available in 8 sizes, ranging from 54 to 290 mm in diameter. Torque ranges are available from 4Nm to 500Nm. The Euroline SFM electromagnetic clutches start or accelerate a load, while the PBM electromagnetic brakes are used as "power on" brakes to decelerate a load or bring it to a complete stop. Typical applications include business machines, copiers, inserting systems, and XYZ coordinate measuring machines.

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