Chain Length Accuracy
According to ISO 606, roller chains are allowed a length tolerance of +0.15 percent based on the nominal length (number of links × pitch). Conveyor chains with attachments may have a tolerance of up to +0.30 percent. Negative length tolerance is excluded because, on the one hand, the chain might not be mountable if the shaft spacing is fixed, and on the other hand, the engagement with the sprocket teeth would be problematic.
Length accuracy and homogeneity play a particularly important role in applications with tight length tolerances and paired sorted chains (parallel operation).
Chain Length Measurement
Our chains are clamped and preloaded with a measuring force according to ISO 606, which is approximately 1% of the breaking force. During this process, the chain length is measured and compared with the nominal length, calculated as the number of links multiplied by the pitch. For chain length measurement, we use a measuring bench that allows us to precisely determine the length of individual chain segments up to 3 meters long.
CCM-S with SLE Function
The CCM-S measures with sensors the wear elongation of chains in operation and thus helps maintenance personnel to timely recognize when the chain needs to be replaced due to wear elongation.
Individual sections of the chain strand can be measured separately and evaluated for deviations from the average elongation. (Special connecting links available separately are required)
Our Specialist for Conveyor Systems with Parallel Running
Precision chains of the JWIS brand are available with tolerance limits even tighter than the standard tolerances. For example, they can be supplied within half of the standard tolerance, or even within desired thirds or sixths of the tolerance. In addition, we also manufacture according to special requirements, such as paired chains within a defined length tolerance. Achieving this level of accuracy requires the highest precision in individual part manufacturing as well as sophisticated and highly accurate assembly technologies.
