Magnetic Brake With Follower Arm
These provide constant tension when used in dedicated payoff applications. The device is ideal for paying off wire, cable and a variety of films and tapes where constant tension is required.
Available in 3 torque ranges.

Features
Bearing-supported magnetic cap for smooth arm movement 
Bearing-mounted Delrin wheel 

Stainless-steel self centering adjustment arm

All magnetic, no electricity, no wearing parts

Theory
The magnetic brake is mounted as shown, central to payoff spool at a fixed centerline distance (CD) which is determined by pulley ratio from brake to spool shaft and timing belt. The adjustment arm attached to magnetic brake has a Delrin wheel riding on diameter C following material down as material pays off to B. This arm angle change decreases the braking torque to maintain constant line tension throughout spool payoff from C to B. The pulley ratios determines the final torque transferred to spool shaft to achieve desired line tension.