The simple and rugged design makes the new CDB0812A well suited for North American steel mills. There are four major components to the brake: coil, arms, base, and friction pucks. The arms, base, and friction pucks are similar to PT Tech’s other CDB brakes, but the coil is entirely new. It greatly simplifies the design and reduces the total number of parts. The coil is potted into a magnetic body. Coils are available to operate in series with DC mill motors or in shunt circuits. The size and shape of the coil/magnetic body was de signed using sophisticated computer software. The software optimizes the flux density without causing a heat problem.
The coil/magnetic body is connected to the base on 3 bolts. On top of the magnetic body is an armature gap indicator and a lifting lug. When the indicator has recessed 1/16,” the brake requires adjusting. Adjusting for wear is a two minute job. The lifting hole is positioned to provide a balanced brake assembly. This helps to make installation easy.
There is a friction puck wear adjusting bolt on one side and a torque adjusting bolt on the other. The wear adjuster bolt has a hex head requiring a 12″ adjust able wrench. The torque adjusting bolt is a button head requiring a 3/8″ Allen wrench. Having different types of bolts helps to eliminate mistakes when making adjustments. adjustments. The patented slotted base allows for ease of installation and removal. Like PT Tech’s other CDB brakes, the base’s tower has machined pockets to hold the friction pucks. During actuation the tower takes the reaction load allowing the arms to move freely to accommodate axial motor movement.
The CDB0812A uses only two pucks. A set of pucks weighs 4% lbs. Replacing worn friction material takes less than 10 minutes.