As the name suggest, chain conveyors are equipped with interlinked chains, selected /manufactured according to the customer specific needs. These run on custom made sprockets on each end.
Ball tables or Ball transfer units are also sometimes known as Ball transfer conveyors. Here the material is pushed manually / through gravity over a series of free balls fixed over metal tables. This is also very effective where the material size is big & needs to be pushed manually over short / long distance.