Whenever a roller chain is utilised, shaft positions is usually arbitrarily established. Nevertheless, in principle, comply with the illustration proven under. That is, should the chain is tensioned horizontally, preserve the top rated tensioned. Avoid vertical transmission every time probable. In an inevitable situation, spot the big sprocket in the bottom regardless in the path of rotation.
When the chain layout is undesirable:
?When the leading is sagging plus the sprocket center distance is short:
As illustrated under, modify the sprocket center distance shaft to eradicate the sag.
?When the leading is sagging plus the sprocket center distance is long:
As illustrated under, set up an 
idler from inside to get rid of the sag.
?Once the chain is vertical or inclined:
Get rid of the extra sag by a tensioner. In this instance, a tensioner that instantly eliminates the sag gives far better outcomes.
Whenever a pulsating load acts in higher velocity operation:
The chain’s vibration as well as load influence frequency or chordal action may synchronize to amplify vibration within the chain. Since vibration affects the chain, get countermeasures to prevent vibration inside the following measures:
?Alter the chain pace.
?Enhance chain tension. Nonetheless, 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 prevent vibration.
Note: Chordal action refers for the vertical movement of chain induced when it is actually engaged with sprockets.
