Whenever a roller chain is employed, shaft positions can be arbitrarily determined. Nevertheless, in principle, adhere to the illustration shown below. 
That may be, if the chain is tensioned horizontally, hold the major tensioned. Stay clear of vertical transmission whenever feasible. In an inevitable case, place the massive sprocket with the bottom irrespective in the direction of rotation.
When the chain layout is undesirable:
?Once the top is sagging and also the sprocket center distance is brief:
As illustrated under, adjust the sprocket center distance shaft to eradicate the sag.
?When the major is sagging as well as the sprocket center distance is prolonged:
As illustrated under, install an idler from within to get rid of the sag.
?When the chain is vertical or inclined:
Eliminate the additional sag by a tensioner. In this case, a tensioner that automatically eliminates the sag gives greater final results.
Whenever a pulsating load acts in higher velocity operation:
The chain’s vibration plus the load effect frequency or chordal action may well synchronize to amplify vibration on the chain. Given that vibration has an effect on the chain, consider countermeasures to avoid vibration within the following measures:
?Change the chain velocity.
?Raise chain tension. On the other hand, note that over-
tensioning can shorten the daily life of the chain. ?Use an idler or tensioner to divide the span
?Set up a manual stopper to stop vibration.
Note: Chordal action refers on the vertical movement of chain induced when it is engaged with sprockets.
Layout of chain position
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