Whenever a roller chain is used, shaft positions may be arbitrarily determined. Nevertheless, in principle, adhere to the illustration shown under. That is, in case the chain is tensioned horizontally, continue to keep the major tensioned. Steer clear of vertical transmission anytime achievable. In an inevitable case, spot the significant sprocket with the bottom regardless of the direction of rotation.
Once the chain layout is undesirable:
?When the leading is sagging as well as the sprocket center distance is quick:
As illustrated below, modify the sprocket center distance shaft to eliminate the sag.
?Once the best is sagging plus the sprocket center distance is prolonged:
As illustrated below, 
set up an idler from inside to eliminate the sag.
?When the chain is vertical or inclined:
Remove the extra sag by a tensioner. In this case, a tensioner that automatically eliminates the sag provides greater success.
When a pulsating load acts in substantial velocity operation:
The chain’s vibration along with the load affect frequency or chordal action may synchronize to amplify vibration within the chain. Considering the fact that vibration influences the chain, get countermeasures to prevent vibration in the following measures:
?Adjust the chain velocity.
?Boost chain stress. Having said that, note that over-
tensioning can shorten the 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 caused when it’s engaged with sprockets.
