When a roller chain is employed, shaft positions is often arbitrarily established. Even so, in principle, observe the illustration proven under. That’s, if the chain is tensioned horizontally, continue to keep the major tensioned. Steer clear of vertical 
transmission whenever attainable. In an inevitable case, spot the massive sprocket on the bottom irrespective with the direction of rotation.
Once the chain layout is undesirable:
?Once the top rated is sagging as well as sprocket center distance is quick:
As illustrated beneath, alter the sprocket center distance shaft to eliminate the sag.
?When the top rated is sagging plus the sprocket center distance is lengthy:
As illustrated below, install an idler from inside to get rid of the sag.
?When the chain is vertical or inclined:
Eliminate the additional sag by a tensioner. In this case, a tensioner that immediately eliminates the sag offers improved outcomes.
When a pulsating load acts in higher speed operation:
The chain’s vibration along with the load affect frequency or chordal action may well synchronize to amplify vibration within the chain. Since vibration affects the chain, consider countermeasures to prevent vibration within the following measures:
?Modify the chain velocity.
?Increase chain tension. However, note that over-
tensioning can shorten the daily life in the chain. ?Use an idler or tensioner to divide the span
?Set up a guidebook stopper to prevent vibration.
Note: Chordal action refers to your vertical motion of chain caused when it is engaged with sprockets.
