When a roller chain is used, shaft positions is often arbitrarily determined. Having said that, in principle, observe the illustration shown below. That may be, should the chain is tensioned horizontally, retain the best tensioned. Stay clear of vertical transmission anytime attainable. In an inevitable situation, spot the significant sprocket on the bottom irrespective from the course of rotation.
Once the chain layout is undesirable:
?Once the top is sagging and the sprocket center distance is brief:
As illustrated under, modify the sprocket center distance shaft to remove the sag.
?When the top rated is sagging plus the sprocket center distance is long:
As illustrated beneath, install an idler from within to reduce the sag.
?Once the chain is vertical or inclined:
Get rid of the additional sag by a tensioner. In this instance, a tensioner that immediately eliminates the sag offers greater final results.
When a pulsating load acts in high speed operation:
The chain’s vibration and also the load influence frequency or chordal action may perhaps synchronize to amplify vibration over the chain. Considering the fact that vibration influences the chain, get countermeasures to avoid vibration in the following measures:
?Change the chain speed.
?Increase chain stress. Having said that, note that over-
tensioning can shorten the existence in the chain. ?Use an idler or tensioner to divide the span
?Install a 
guide stopper to stop vibration.
Note: Chordal action refers to the vertical motion of chain brought on when it truly is engaged with sprockets.