Whenever a roller chain is utilized, shaft positions is often arbitrarily established. On the other hand, in principle, follow the illustration proven below. That may be, when the chain is tensioned horizontally, maintain the leading tensioned. Stay away from vertical transmission each time possible. In an inevitable case, place the huge sprocket with the bottom irrespective from the path of rotation.
Once the chain layout is undesirable:
?When the best is sagging along with the sprocket center distance is brief:
As illustrated below, change the sprocket center distance shaft to reduce the sag.
?Once the top is sagging plus the sprocket center distance is prolonged:
As illustrated below, install an idler from within to do away with the sag.
?When the chain is vertical or inclined:
Reduce the additional sag by a tensioner. In this instance, a tensioner that automatically eliminates 
the sag offers far better final results.
When a pulsating load acts in substantial speed operation:
The chain’s vibration and the load affect frequency or chordal action may synchronize to amplify vibration within the chain. Since vibration affects the chain, get countermeasures to avoid vibration within the following measures:
?Modify the chain velocity.
?Improve chain stress. Nevertheless, note that over-
tensioning can shorten the existence of the chain. ?Use an idler or tensioner to divide the span
?Install a guide stopper to avoid vibration.
Note: Chordal action refers to your vertical motion of chain caused when it truly is engaged with sprockets.
