When a roller chain is employed, shaft positions is often arbitrarily determined. On the other hand, in principle, stick to the illustration proven under. That is definitely, should the chain is tensioned horizontally, maintain the prime tensioned. Prevent vertical transmission each time probable. In an inevitable case, location the significant sprocket with the bottom irrespective on the direction of rotation.
When the chain layout is undesirable:
?Once the prime is sagging along with the sprocket center distance is brief:
As illustrated beneath, alter the sprocket center distance shaft to get rid of the sag.
?When the prime is sagging as well as sprocket center distance is lengthy:
As illustrated beneath, set up an idler from inside to remove the 
sag.
?When the chain is vertical or inclined:
Reduce the extra sag by a tensioner. In this case, a tensioner that instantly eliminates the sag provides far better effects.
Whenever a pulsating load acts in higher velocity operation:
The chain’s vibration as well as load effect frequency or chordal action may possibly synchronize to amplify vibration around the chain. Because vibration has an effect on the chain, take countermeasures to prevent vibration from the following measures:
?Change the chain velocity.
?Improve chain stress. On the other hand, note that over-
tensioning can shorten the existence on the chain. ?Use an idler or tensioner to divide the span
?Install a guidebook stopper to avoid vibration.
Note: Chordal action refers to the vertical movement of chain caused when it is engaged with sprockets.
