Whenever a roller chain is made use of, shaft positions may be arbitrarily determined. On the other hand, in principle, follow the illustration proven beneath. That is, when the chain is tensioned horizontally, preserve the major tensioned. Stay away from vertical transmission when achievable. In an inevitable situation, location the substantial sprocket at the bottom irrespective from the course of rotation.
When the chain layout is undesirable:
?When the leading is sagging as well as the sprocket center distance is short:
As illustrated beneath, change the sprocket center distance shaft to eliminate the sag.
?When the leading is sagging as well as the sprocket center distance is prolonged:
As illustrated under, install an idler from inside to eliminate the sag.
?When the chain is vertical or inclined:
Remove the additional sag by a tensioner. In this instance, a tensioner that automatically eliminates the sag gives better results.
When a pulsating load acts in substantial velocity operation:
The chain’s vibration and the load influence frequency or chordal action may perhaps synchronize to amplify vibration over the chain. Because vibration affects the chain, take countermeasures to avoid vibration inside the following measures:
?Transform the chain 
pace.
?Boost chain tension. Having said that, note that over-
tensioning can shorten the lifestyle of the chain. ?Use an idler or tensioner to divide the span
?Set up a guide stopper to stop vibration.
Note: Chordal action refers to the vertical motion of chain brought about when it is actually engaged with sprockets.
