Whenever a roller chain is employed, shaft positions can be arbitrarily determined. Nevertheless, in principle, follow the illustration shown under. That is definitely, should the chain 
is tensioned horizontally, hold the top rated tensioned. Prevent vertical transmission whenever possible. In an inevitable case, place the massive sprocket with the bottom irrespective in the direction of rotation.
When the chain layout is undesirable:
?When the top is sagging and the sprocket center distance is brief:
As illustrated beneath, change the sprocket center distance shaft to get rid of the sag.
?Once the top rated is sagging and also the sprocket center distance is extended:
As illustrated beneath, install an idler from within to get rid of the sag.
?Once the chain is vertical or inclined:
Reduce the extra sag by a tensioner. In this instance, a tensioner that automatically eliminates the sag gives far better final results.
Whenever a pulsating load acts in high velocity operation:
The chain’s vibration along with the load influence frequency or chordal action may well synchronize to amplify vibration on the chain. Because vibration influences the chain, consider countermeasures to avoid vibration in the following measures:
?Change the chain pace.
?Enhance chain tension. Even so, note that over-
tensioning can shorten the daily life of your chain. ?Use an idler or tensioner to divide the span
?Set up a guide stopper to stop vibration.
Note: Chordal action refers for the vertical motion of chain triggered when it is engaged with sprockets.
