When a roller chain is used, shaft positions can be arbitrarily determined. Nonetheless, in principle, follow the illustration shown under. That is definitely, when the chain is tensioned horizontally, preserve the top rated tensioned. Steer clear of 
vertical transmission each time feasible. In an inevitable situation, place the massive sprocket at the bottom regardless of the path of rotation.
When the chain layout is undesirable:
?Once the leading is sagging as well as the sprocket center distance is brief:
As illustrated beneath, alter the sprocket center distance shaft to eliminate the sag.
?When the best is sagging along with the sprocket center distance is extended:
As illustrated below, install an idler from within to remove the sag.
?When the chain is vertical or inclined:
Eradicate the additional sag by a tensioner. In this instance, a tensioner that instantly eliminates the sag provides much better outcomes.
When a pulsating load acts in higher speed operation:
The chain’s vibration and the load influence frequency or chordal action may possibly synchronize to amplify vibration on the chain. Since vibration impacts the chain, take countermeasures to prevent vibration in the following measures:
?Adjust the chain speed.
?Raise chain stress. Nonetheless, note that over-
tensioning can shorten the life on the chain. ?Use an idler or tensioner to divide the span
?Install a guide stopper to stop vibration.
Note: Chordal action refers on the vertical motion of chain brought on when it is engaged with sprockets.
