When a roller chain is applied, shaft positions can be arbitrarily established. Even so, in principle, 
follow the illustration proven beneath. That is, if your chain is tensioned horizontally, keep the top rated tensioned. Prevent vertical transmission anytime doable. In an inevitable case, area the big sprocket at the bottom irrespective of the route of rotation.
When the chain layout is undesirable:
?When the prime is sagging as well as sprocket center distance is short:
As illustrated beneath, modify the sprocket center distance shaft to remove the sag.
?Once the major is sagging as well as the sprocket center distance is lengthy:
As illustrated below, install an idler from within to do away with the sag.
?Once the chain is vertical or inclined:
Eliminate the extra sag by a tensioner. In this case, a tensioner that automatically eliminates the sag provides improved success.
When a pulsating load acts in large velocity operation:
The chain’s vibration as well as load impact frequency or chordal action might synchronize to amplify vibration within the chain. Because vibration influences the chain, get countermeasures to avoid vibration while in the following measures:
?Change the chain speed.
?Enhance chain tension. Nevertheless, note that over-
tensioning can shorten the existence in the chain. ?Use an idler or tensioner to divide the span
?Install a manual stopper to avoid vibration.
Note: Chordal action refers to your vertical motion of chain triggered when it can be engaged with sprockets.