When a roller chain is used, shaft positions is often arbitrarily established. Nonetheless, in principle, stick to the illustration proven below. 
Which is, should the chain is tensioned horizontally, maintain the major tensioned. Stay away from vertical transmission each time feasible. In an inevitable situation, area the substantial sprocket at the bottom irrespective from the course of rotation.
When the chain layout is undesirable:
?When the leading is sagging as well as the sprocket center distance is quick:
As illustrated below, adjust the sprocket center distance shaft to get rid of the sag.
?When the top rated is sagging plus the sprocket center distance is lengthy:
As illustrated beneath, set up an idler from inside to eradicate the sag.
?Once the chain is vertical or inclined:
Eradicate the extra sag by a tensioner. In this instance, a tensioner that instantly eliminates the sag offers improved effects.
Whenever a pulsating load acts in substantial speed operation:
The chain’s vibration plus the load affect frequency or chordal action may synchronize to amplify vibration over the chain. Considering the fact that vibration has an effect on the chain, take countermeasures to avoid vibration inside the following measures:
?Alter the chain speed.
?Raise chain tension. However, note that over-
tensioning can shorten the daily life of the chain. ?Use an idler or tensioner to divide the span
?Install a guidebook stopper to avoid vibration.
Note: Chordal action refers on the vertical movement of chain brought on when it really is engaged with sprockets.
