Chain length accuracy should be measured according to the following requirements
A. The chain should be cleaned before measurement.
B. The chain to be measured should be surrounded by two sprockets, and the upper and lower sides of the chain to be measured should be supported.
C. The chain should be kept under the state of applying one-third of the minimum ultimate tensile load for 1min before measurement.
D. When measuring, apply the specified measuring load on the chain to make the upper and lower sides of the chain tensioned. The chain and the sprocket should be ensured to fit properly.
E. Measure the center distance between two sprockets.
Measurement of chain elongation
1. In order to remove the clearance of the whole chain, it is necessary to measure the chain under a certain degree of pulling tension.
2. Measurement should be made at 6-10 links in order to minimize errors.
3. Measure the inner L1 and outer L2 dimensions between the rollers of the number of links to find out the judgment size L=(L1+L2)/2.
4. Determine the length of the chain extension, and compare this value with the value of the chain extension limit in the previous item.
Chain elongation = judgment size - reference length / reference length * 100%.
Base length=chain pitch*number of links