When a roller chain is utilised, shaft positions is usually arbitrarily established. Nonetheless, in principle, observe the illustration shown below. That may be, in the event 
the chain is tensioned horizontally, retain the prime tensioned. Keep away from vertical transmission whenever attainable. In an inevitable situation, spot the large sprocket at the bottom regardless of your path of rotation.
When the chain layout is undesirable:
?When the best is sagging plus the sprocket center distance is quick:
As illustrated beneath, adjust the sprocket center distance shaft to get rid of the sag.
?Once the top rated is sagging and also the sprocket center distance is lengthy:
As illustrated under, install an idler from inside to remove the sag.
?When the chain is vertical or inclined:
Reduce the extra sag by a tensioner. In this case, a tensioner that automatically eliminates the sag gives greater effects.
Whenever a pulsating load acts in large velocity operation:
The chain’s vibration plus the load impact frequency or chordal action may synchronize to amplify vibration around the chain. Since vibration influences the chain, get countermeasures to stop vibration inside the following measures:
?Transform the chain speed.
?Boost chain stress. However, note that over-
tensioning can shorten the lifestyle from the chain. ?Use an idler or tensioner to divide the span
?Set up a guide stopper to avoid vibration.
Note: Chordal action refers on the vertical motion of chain brought on when it truly is engaged with sprockets.