When a roller chain is made use of, shaft positions may be arbitrarily determined. Nonetheless, in principle, follow the illustration shown beneath. Which is, in case the chain is tensioned horizontally, continue to keep the leading tensioned. Stay away from vertical transmission anytime attainable. In an inevitable case, area the huge sprocket on the bottom regardless from the route of rotation.
Once the chain layout is undesirable:
?Once the leading is sagging and the sprocket center distance is short:
As illustrated below, adjust the sprocket center distance shaft to reduce the sag.
?When the top is sagging as well as the sprocket center distance is prolonged:
As illustrated under, install an idler from inside to eliminate the sag.
?Once the chain is vertical or inclined:
Eradicate the extra sag by a tensioner. In this instance, a tensioner that immediately eliminates the sag gives better final results.
When a pulsating load acts in high speed operation:
The chain’s vibration along with the load impact frequency or chordal action might synchronize to amplify vibration over the chain. Considering the fact that vibration impacts the chain, consider countermeasures to avoid vibration inside the following measures:
?Adjust the chain pace.
?Maximize chain tension. Nonetheless, note that over-
tensioning can shorten the life of the chain. ?Use an idler or tensioner to divide the span
?Install a manual stopper to prevent vibration.
Note: Chordal action refers on the vertical motion of chain induced when it can be engaged with 
sprockets.
