Tightening chain

[skyhuck]

This is what I think ( wrongly or rightly ) It is as Dave says ware . You get ware on the rivet joints which becomes clearance on the fit . The chain when being pulled on the underside of the bar " stretches " and when being pushed on the top of the bar " compresses " . Its because of this clearance in the joints that the drive links still sit in the sprocket . Add in some ware to the under side of the tie straps and the rails of the bar and you get a " farmers chain "

 

There will be some small element of this, but IMO wear to the underside of the chain and the bar are by far the biggest cause of slack.

[Stubby]

There will be some small element of this, but IMO wear to the underside of the chain and the bar are by far the biggest cause of slack.

 

Unless you use a Sugihara light weight pro bar then its all the chain and not the bar rail

[BishBashBosh]

Saturday morning bunfight:fight:

 

Whatever the causes the effect is the same. New chains go slack after only a few minutes and need adjustment.

 

I check chain tension quite frequently. It takes less than a second and helps get the best out of your equipment, both performance and longevity.

Although you only have to watch a few YouTube videos to see that much of the world likes fresh air between the bar and chain!

[Mesterh]

Compare the length of a new chain to the length of an old chain. Surely that will tell you if they stretch or not.

[treequip]

Compare the length of a new chain to the length of an old chain. Surely that will tell you if they stretch or not.

 

This man speaks the right, relative measurement would be the scientific way to test a theory.

 

A chain will "stretch" and it is subject to the laws of thermal expansion as is the guide bar, and that's the point that people are missing.

 

They see a slack chain and assume it has grown longer. While that is the case the majority of the slackness is caused by the thermal expansion in the guide bar. Volumetrically the bar "grows" more than the chain which causes the bar to move fractionally at the weakest link, which is the bar mount, unless you dogged the bejesus out of it in which case the saw just goes sight as eff as Huck rightly states.

[Stubby]

This man speaks the right, relative measurement would be the scientific way to test a theory.

 

A chain will "stretch" and it is subject to the laws of thermal expansion as is the guide bar, and that's the point that people are missing.

 

They see a slack chain and assume it has grown longer. While that is the case the majority of the slackness is caused by the thermal expansion in the guide bar. Volumetrically the bar "grows" more than the chain which causes the bar to move fractionally at the weakest link, which is the bar mount, unless you dogged the bejesus out of it in which case the saw just goes sight as eff as Huck rightly states.

 

And that is why it takes so long to get up in the morning

[treequip]

And that is why it takes so long to get up in the morning

 

Sorry for the late response, I was out walking the dogs