When a roller chain is utilized, shaft positions might be arbitrarily determined. Nevertheless, in principle, stick to the illustration proven beneath. Which is, if 
the chain is tensioned horizontally, keep the prime tensioned. Prevent vertical transmission whenever attainable. In an inevitable situation, spot the large sprocket in the bottom irrespective in the path of rotation.
When the chain layout is undesirable:
?Once the best is sagging as well as sprocket center distance is brief:
As illustrated under, change the sprocket center distance shaft to reduce the sag.
?When the best is sagging as well as the sprocket center distance is prolonged:
As illustrated under, install an idler from within to eliminate the sag.
?Once the chain is vertical or inclined:
Eliminate the additional sag by a tensioner. In this instance, a tensioner that automatically eliminates the sag gives better effects.
Whenever a pulsating load acts in large pace operation:
The chain’s vibration plus the load influence frequency or chordal action might synchronize to amplify vibration within the chain. Considering the fact that vibration impacts the chain, take countermeasures to stop vibration while in the following measures:
?Adjust the chain pace.
?Maximize chain stress. However, note that over-
tensioning can shorten the daily life with the chain. ?Use an idler or tensioner to divide the span
?Set up a guidebook stopper to avoid vibration.
Note: Chordal action refers for the vertical movement of chain brought about when it can be engaged with sprockets.
