DETERMINING ROLLER LENGTH

The best method for ordering additional or replacement rollers is to always specify the between frames dimension (BF). This will ensure a proper fit for rollers and conveyor frames. If the end-user does not know what the BF dimension is, simply have this person measure between the frames of the specified unit. However, there are times when getting a between frames dimension is difficult. In this instance, it is very important to use the properterminology to select a roller size.The only dimension acceptable in determining roller length when the BF is not known, is the"end-of-bearing" measurement. The importance here cannot be overstated. Since conveyor/roller manufacturers vary the length of the roller tube in relation to the manner in which the bearing is inserted, and depending on the individual bearing being used countless dimensions are possible. For example, one manufacturer may use an 18-1/2" long tube in production of its 19" BF roller, while another may be using a different bearing or possibly a different method of installing the bearing and cut its tube to a length of 18-1/4". This 1/4" difference is enough to be the culprit of serious problems, at exactly the time the end-user receives a shipment of nonreturnable rollers the wrong length!