1. Machine Setup and Operation If more than single cavity machine, takeout may be coming out over deadplate too fast causing bottles to swing and collide at contact area   1. Machine Setup and Operation Ajust takeout 2. Conveyor Improper setting of pusher cams Worn pusher arms resulting in inconsistent pushing Bottles hitting each other at transfer or stacker pickup point Improper pusher shape Pusher arm material unsuitable Ware hitting metal guides on stacker or conveyor Incorrect transfer from machine conveyor to stacker conveyor Conveyor belt shipping   2. Conveyor Correct setting of pusher cams Worn pusher arms should be replaced Correct spacing of bottles on conveyor Correct pusher shape Use non-ferrous material or, if using steel, cover with a carbon-based material for ware pushers Adjust and improve transfer from machine conveyor to stacker conveyor Check operation of conveyor belt 3. Stacking Equipment Incorrect setting of bottle cam (tong stacker) Incorrect setting of pusher bar (push bar stacker) Push bar-bare metal at incorrect temperature Push bar speed too great   3. Stacking Equipment Correct setting of bottle cam Correct setting of pusher bar Cover pusher bar with insulation material Reduce speed of pusher bar to reduce bottle impact