Whats the purpose of the bumper drive links?

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komatsuvarna

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Stoped by my dealer today for a chain. Ive always ran oregon LGX, but they were out of it in .058, so I got LPX. Its not a safety chain, but it has the bumper drive links. It cuts great,alot better than the LGX with my crappy hand filing. Whats the bumper drive links do?
 
Also an anti-vibration feature on some chains

Some chains that have ramped DL's are not low-kickback rated, but are
supposed to be an anti-vibration design.
 
The bumper drives are an anti kick back feature, so it kinda makes it a safety chain just like the popular 20 lpx in .325. REJ2

Wrong, not acording to Oregon anyway. The 72lp and lpx are rated for professional use and are not safety rated chains. They are low vibration chains and the bumper drive links are why.

Personally I like the 72lp chain alot, maybe even a little better then the LG and LGX.

The downside is it don't like to bore cut as well.
 
Wrong, not acording to Oregon anyway. The 72lp and lpx are rated for professional use and are not safety rated chains. They are low vibration chains and the bumper drive links are why.

Personally I like the 72lp chain alot, maybe even a little better then the LG and LGX.

The downside is it don't like to bore cut as well.

:agree2: No problems with LPX here, and it cut's just as fast as others, But I do prefer LGX, just because im a little old fashioned.
 
Wrong, not acording to Oregon anyway. The 72lp and lpx are rated for professional use and are not safety rated chains. They are low vibration chains and the bumper drive links are why.

Personally I like the 72lp chain alot, maybe even a little better then the LG and LGX.

The downside is it don't like to bore cut as well.

I dont think I'm entirely wrong, my Oregon book shows the bumper drive link to be a anti kick back feature on the 72lp just as I stated, the term safety chain was subjective on my part. You are correct, the 72lp is not a low kick back rated chain REJ2
 
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I dont think I'm entirely wrong, my Oregon book shows the bumper drive link to be a anti kick back feature on the 72lp just as I stated, the term safety chain was subjective on my part. You are correct, the 72lp is not a low kick back rated chain REJ2

Oh I'm sure the bumper drive links would be a help in reducing kickback no doubt, but it is still not classified as a low kickback chain.

From another Oregon book.

attachment.php
 
I was always under the impression that the vibration reduction/vibe ban feature came from the fact that the back portion of the drive link was clipped off creating extra travel space/almost a cushion space between the drive links and the bar.

I am also not convinced that the bumber drive links have NOTHING to do with anti kickback. Think about it, stihl rsc3 vs rsc--the rsc3 has the green label. Green label means more safe. RSC3 and RSC are analogous to lpx and lgx respectively.
 
I dug the box out and its not classified as low kickback. Big yellow warning label on the box. Oregons reduced kickback chains have blue labels.:cheers:
 
While we are on the topic, anyone have pictures of the different chain types (as far as non-kickback, anti kickback - non-safety, anti kickback - safety.

I've seen 3/8 chain (which confuses me...why so large, but very safety....) with Lots-o-bumpers, basically almost a complete solid band across the top when viewing from the side..


Plus I have some Stihl chain (most of a roll) with a ramped bumper prior to the cutter, but not the 'extended' link like I see on a lot of 91LP chain.

Jay
 
While we are on the topic, anyone have pictures of the different chain types (as far as non-kickback, anti kickback - non-safety, anti kickback - safety.
Jay

Not sure if this helps but this explains standard, bumper link, and guard link...

05112009545.jpg

05112009544.jpg

05112009543.jpg


And the difference between the drive link on a standard chain (bottom) versus the drive link on a bumper or guard link chain. As you can see above the guard link chain has a different tie strap configuration as well...

05112009540.jpg
 
Not sure if this helps but this explains standard, bumper link, and guard link...


And the difference between the drive link on a standard chain (bottom) versus the drive link on a bumper or guard link chain. As you can see above the guard link chain has a different tie strap configuration as well...

That was cool! thank you.

so the guard link would be a low-kickback chain...

and just the bumper link is just as about as aggressive when cross-cutting (not a plunge cut) ?

this makes total sense :monkey: I think I got it!

J
 

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