When a roller chain is applied, shaft positions is usually arbitrarily established. Even so, in principle, adhere to the illustration shown 
under. That is, when the chain is tensioned horizontally, continue to keep the leading tensioned. Prevent vertical transmission anytime attainable. In an inevitable situation, spot the massive sprocket in the bottom irrespective with the direction of rotation.
Once the chain layout is undesirable:
?When the leading is sagging and the sprocket center distance is brief:
As illustrated under, alter the sprocket center distance shaft to eliminate the sag.
?When the leading is sagging plus the sprocket center distance is lengthy:
As illustrated under, install an idler from within to eliminate the sag.
?When the chain is vertical or inclined:
Remove the extra sag by a tensioner. In this instance, a tensioner that instantly eliminates the sag offers improved success.
Whenever a pulsating load acts in large pace operation:
The chain's vibration and also the load affect frequency or chordal action could synchronize to amplify vibration to the chain. Considering the fact that vibration has an effect on the chain, get countermeasures to prevent vibration from the following measures:
?Alter the chain speed.
?Maximize chain stress. However, note that over-
tensioning can shorten the daily life with the chain. ?Use an idler or tensioner to divide the span
?Install a guide stopper to avoid vibration.
Note: Chordal action refers to your vertical movement of chain triggered when it is actually engaged with sprockets.
