Whenever a roller chain is utilised, shaft positions is usually arbitrarily established. However, in principle, comply with the illustration proven below. That may be, if the chain is tensioned horizontally, preserve the top rated tensioned. Stay clear of vertical transmission when possible. In an inevitable situation, location the large sprocket at the bottom irrespective of your direction of rotation.
When the chain layout is undesirable:
?When the top rated is sagging plus the sprocket center distance is quick:
As illustrated beneath, change the sprocket center distance shaft to eradicate the sag.
?Once the top rated is sagging and the sprocket center distance is extended:
As illustrated beneath, set up an idler from within to do away with the sag.
?Once the chain is vertical or inclined:
Eliminate the additional sag by a tensioner. In this case, a tensioner that automatically eliminates the sag offers greater success.
Whenever a pulsating load acts in large velocity operation:
The chain’s vibration and the load effect frequency or chordal action may well synchronize to amplify vibration within the chain. Given that vibration affects the chain, take countermeasures to stop vibration during the following measures:
?Alter the chain velocity.
?Boost chain stress. Having said that, note that over-
tensioning can shorten the daily life with the chain. ?Use an idler or 
tensioner to divide the span
?Set up a guidebook stopper to avoid vibration.
Note: Chordal action refers towards the vertical motion of chain brought on when it’s engaged with sprockets.