When a roller chain is utilised, shaft positions could be arbitrarily determined. Even so, in principle, comply with the illustration shown beneath. That is, if the chain is tensioned horizontally, retain the major tensioned. Avoid vertical transmission each time probable. In an inevitable situation, place the huge sprocket on the bottom regardless in 
the direction of rotation.
Once the chain layout is undesirable:
?Once the major is sagging along with the sprocket center distance is quick:
As illustrated under, change the sprocket center distance shaft to eliminate the sag.
?When the best is sagging as well as sprocket center distance is prolonged:
As illustrated below, set up an idler from inside to do away with the sag.
?When the chain is vertical or inclined:
Do away with the additional sag by a tensioner. In this case, a tensioner that automatically eliminates the sag gives superior benefits.
Whenever a pulsating load acts in large velocity operation:
The chain’s vibration as well as the load influence frequency or chordal action could synchronize to amplify vibration on the chain. Considering that vibration impacts the chain, consider countermeasures to stop vibration from the following measures:
?Modify the chain speed.
?Enhance chain tension. Having said that, note that over-
tensioning can shorten the daily life on the chain. ?Use an idler or tensioner to divide the span
?Set up a guidebook stopper to stop vibration.
Note: Chordal action refers to your vertical motion of chain induced when it can be engaged with sprockets.
