When a roller chain is applied, shaft positions can be arbitrarily established. On the other hand, in principle, comply with the illustration proven under. That’s, in case the chain is tensioned horizontally, hold the top rated tensioned. Avoid vertical transmission when achievable. In an inevitable situation, place the massive sprocket with the bottom irrespective on the direction of rotation.
When the chain layout is undesirable:
?When the best is sagging as well as the sprocket center distance is short:
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.
Whenever a pulsating load acts in high pace operation:
The chain’s vibration and also the load affect frequency or chordal action could synchronize to amplify vibration over the chain. Considering the fact that vibration impacts the chain, take countermeasures to stop vibration in the following measures:
?Change the chain velocity.
?Improve chain tension. Nevertheless, note that over-
tensioning can shorten the existence on the chain. ?Use an idler or tensioner to divide the span
?Install a manual stopper to avoid vibration.
Note: Chordal action refers on the vertical movement of chain brought about when it’s engaged with sprockets.