Application data sheet Wobbler Feeder - English - 1, MINERALS - APRON FEEDER - APPLICATION DATA SHEET. 2. 3, In order to provide a quotation, please complete this application data sheet so we can offer you the. 4, most efficient and cost effective apron feeder for your operation. We realize it is not . 54, A, W, To Calculate Chain / Pan speed: 55, LL, S (fpm).chain apron feeder calculation,Apron Feeders - Ckit.za - The Bulk Materials Handling Portal and .The chain pull is the part of the power equation and it also determines the size of the tractor chain, the rollers, and the structural frame for the feeder. 3.6 Drives. Normally variable speed drives are used for heavy duty apron feeders, variable speed drives offer tremendous flexibility. Today's sophisticated variable frequency.