Most flat bottom items can be handled on either wheel or roller conveyor, with the wheel type generally preferred because of its lighter weight, easier portability, and greater liveliness. For certain applications however, roller conveyors provide more economical handling and should be given careful consideration. The 1 3/8 in. dia. gauge roller, for example, usually is more economical than wheel when the packages are 14 inches or more in length and light enough to be handled with the rollers on 4 1/2 in. centers or more.
When conveyor weight is an important factor, aluminum conveyor sections (either roller or wheel) should also be considered. Roller conveyor must be used for recessed bottom containers and certain other items that will not roll on wheels. Roller conveyor will also handle bales under certain conditions, and some objects with cleated bottoms. But for MOST items with irregular shapes and surfaces, it is advisable to consider belt or other powered conveyors, which capably move objects of almost any shape or form.
Wheel Conveyor: The correct wheel pattern is determined by the smallest package to be conveyed. To provide proper stability there MUST be at least three axles under the lenght of the item, with a minimum of seven wheels supporting the object at all times. The maximum size object to be handled determines the width of the conveyor to be used.
Roller Conveyor: A properly selected roller conveyor must provide at least three rolls under the shortest load at all times. Thus, to determine the maximum distance between roller centers, divide the lenght of your shortest package by three. A 9″ long minimum package for example, requires 3″ roller spacing. Heavy loads and some soft or rought bottom loads oftern require roll centers closer for best results.
Weight of Commodity Handled: The maximum load which can be conveyed on any roller or wheel.
1. Capacity of individual wheels or rollers or axles.
2. Capacity of the frame.
Light Medium Duty Applications: Since the individual wheel capacity or roller capacity easily exceeds most light and medium duty requirements, the frame load ratings generally should be regarded as the maximum loads which may be handled efficiently. The capacity figures usually indicate the total distributed load per 10 ft. section when supports are placed on 10 ft. centers.
Heavy Duty Applications: For heavy duty loads, refer to the individual roller capacities. Positioning of rollers must be on centers close enough to support the maximum load conveyed and the frame must also be of adequate capacity.
Plain Ball Bearing: For indoor use, are must be free of moisture, dust or abrasives, for normal operations. Not to beused where continuous high speed running is required. For use where minimum pitch is necassary.
Dust Tight Bearing: Ideal in a dusty atmosphere such as foundries. This sealed bearing is designed to run dry and cannot be lubricated.
Grease Pack Bearings: An extremely sealed bearing grease packed during manufacture. Ideal for installations confronted with high humidity, dust, possible water or where conveyor is not accessible to normal maintenance. This bearing or the pressure lubricated bearing is ideal for roller bed power conveyors.
Grease Sealed Bearings: For general all around use, indoors, dusty or wet conditions.
Regreasable Bearings: Alemite fittings permit periodic pressure lubrication, Recommended for high speed power conveyors.