When a roller chain is made use of, shaft positions is usually arbitrarily determined. However, in principle, follow the illustration proven beneath. That is, in case the chain is tensioned horizontally, hold the leading tensioned. Avoid vertical transmission every time feasible. In an inevitable 
case, location the massive sprocket at the bottom regardless of your course of rotation.
When the chain layout is undesirable:
?Once the major is sagging as well as the sprocket center distance is quick:
As illustrated beneath, change the sprocket center distance shaft to get rid of the sag.
?When the leading is sagging and the sprocket center distance is long:
As illustrated beneath, install an idler from within to eradicate the sag.
?Once the chain is vertical or inclined:
Do away with the additional sag by a tensioner. In this instance, a tensioner that automatically eliminates the sag gives superior effects.
Whenever a pulsating load acts in higher velocity operation:
The chain’s vibration along with the load affect frequency or chordal action could synchronize to amplify vibration about the chain. Considering the fact that vibration affects the chain, get countermeasures to stop vibration inside the following measures:
?Modify the chain pace.
?Boost chain tension. However, note that over-
tensioning can shorten the life with the chain. ?Use an idler or tensioner to divide the span
?Install a guide stopper to stop vibration.
Note: Chordal action refers for the vertical motion of chain brought on when it can be engaged with sprockets.
