Whenever a roller chain is applied, shaft positions is often arbitrarily established. On the other hand, in principle, stick to the illustration shown beneath. That is, in the event the chain is tensioned horizontally, maintain the prime tensioned. Prevent vertical transmission each time attainable. In an inevitable case, location the big sprocket with the bottom irrespective on the direction of rotation.
Once the chain layout is undesirable:
?Once the major is sagging 
and the sprocket center distance is brief:
As illustrated under, alter the sprocket center distance shaft to get rid of the sag.
?Once the leading is sagging and also the sprocket center distance is extended:
As illustrated beneath, set up an idler from inside to remove the sag.
?When the chain is vertical or inclined:
Remove the additional sag by a tensioner. In this instance, a tensioner that instantly eliminates the sag offers far better effects.
When a pulsating load acts in high speed operation:
The chain’s vibration and also the load effect frequency or chordal action may perhaps synchronize to amplify vibration around the chain. Since vibration affects the chain, get countermeasures to stop vibration in the following measures:
?Change the chain velocity.
?Improve chain tension. Nonetheless, note that over-
tensioning can shorten the life of your chain. ?Use an idler or tensioner to divide the span
?Install a guide stopper to prevent vibration.
Note: Chordal action refers to the vertical movement of chain induced when it can be engaged with sprockets.