When a roller chain is applied, shaft positions can be arbitrarily established. Nonetheless, in principle, adhere to the illustration proven under. That’s, in case the chain is tensioned horizontally, preserve the prime tensioned. Stay clear of vertical transmission when achievable. In an 
inevitable case, place the massive sprocket on the bottom irrespective on the direction of rotation.
When the chain layout is undesirable:
?When the leading is sagging as well as the sprocket center distance is quick:
As illustrated below, adjust the sprocket center distance shaft to do away with the sag.
?Once the major is sagging and also the sprocket center distance is lengthy:
As illustrated beneath, install an idler from within to eliminate the sag.
?Once the chain is vertical or inclined:
Remove the extra sag by a tensioner. In this case, a tensioner that immediately eliminates the sag gives much better benefits.
When a pulsating load acts in high pace operation:
The chain’s vibration as well as load affect frequency or chordal action could synchronize to amplify vibration about the chain. Considering the fact that vibration impacts the chain, get countermeasures to stop vibration from the following measures:
?Change the chain pace.
?Increase chain tension. Nevertheless, note that over-
tensioning can shorten the existence from the chain. ?Use an idler or tensioner to divide the span
?Set up a manual stopper to stop vibration.
Note: Chordal action refers on the vertical movement of chain brought about when it’s engaged with sprockets.