Based on DBT’s range of steel rolls, the new CEMA E roll was specifically designed to take into account faster delivery, higher reliability, longer life, lower life-cycle costs and easy retrofit.

DBT said a longer life resulted from state-of-the-art manufacturing and design where a tapered roller bearing retention method which positions the bearing while ensuring consistent reproducible end play is employed.

DBT engineers have also designed new assembly processes and techniques to make sure that every steel roll is put together the same way – and with consistent internal tolerances – to maximise bearing life.

The new roll features a patent-pending lubrication system called Idler PAL (Positive Automatic Lubrication). A spring-loaded compensator disk allows grease expansion when hot and compresses grease as the bearing cools. Breathing bearings live longer – and are greased for life.

In an industry first each roll is triple tested – with measurement of the three most critical parameters: rotational drag, total indicated run-out and bearing end play, with the roll then engraved with a unique serial number.

DBT has also developed a special adapter called RETRO-LOC that allows DBT rolls to be snapped into competitor’s frames.

Further details on the CEMA E roll will be featured in the December edition of American Longwall Magazine – out soon.