Whenever a roller chain is utilized, shaft positions may be arbitrarily determined. However, in principle, adhere to the illustration proven under. That may be, in case the chain is tensioned horizontally, keep the top rated tensioned. Avoid vertical transmission whenever feasible. In an inevitable case, spot the large sprocket on the bottom regardless from the direction of rotation.
When the chain layout is undesirable:
?When the top is sagging as well as the sprocket center distance is brief:
As illustrated below, adjust the sprocket center distance shaft to reduce the sag.
?Once the leading is sagging plus the sprocket center distance is prolonged:
As illustrated below, set up an idler from inside to reduce the sag.
?Once the chain is vertical or inclined:
Eradicate the extra sag by a tensioner. In this case, a tensioner that automatically eliminates the sag provides far better effects.
When a pulsating load acts in large velocity operation:
The chain’s vibration plus the load affect frequency or chordal action may synchronize 
to amplify vibration around the chain. Due to the fact vibration has an effect on the chain, get countermeasures to prevent vibration in the following measures:
?Modify the chain velocity.
?Improve chain stress. However, note that over-
tensioning can shorten the daily life with the chain. ?Use an idler or tensioner to divide the span
?Install a manual stopper to stop vibration.
Note: Chordal action refers for the vertical movement of chain brought on when it is engaged with sprockets.
