When a roller chain is used, shaft positions might be arbitrarily determined. However, in principle, stick to the illustration shown beneath. That’s, in the event the chain is tensioned horizontally, continue to keep the best tensioned. Keep away from vertical transmission every time doable. In an inevitable situation, place the massive sprocket at the bottom irrespective of your direction of rotation.
When the chain layout is undesirable:
?Once the top is sagging as well as sprocket center distance is short:
As illustrated beneath, modify the sprocket center distance shaft to reduce the sag.
?When the prime is sagging and the sprocket center distance is long:
As illustrated below, install an idler from within to reduce the sag.
?Once the chain is vertical or inclined:
Reduce the additional sag by 
a tensioner. In this case, a tensioner that immediately eliminates the sag offers much better benefits.
When a pulsating load acts in substantial velocity operation:
The chain’s vibration as well as load affect frequency or chordal action might synchronize to amplify vibration about the chain. Given that vibration affects the chain, get countermeasures to avoid vibration within the following measures:
?Adjust the chain velocity.
?Increase chain tension. On the other hand, note that over-
tensioning can shorten the daily life in the chain. ?Use an idler or tensioner to divide the span
?Install a guidebook stopper to prevent vibration.
Note: Chordal action refers towards the vertical movement of chain brought on when it is actually engaged with sprockets.
