Chain grinding and filing thread

[Hedgerow]

Iirc I read a piece where it was stated taking back the gullet to far from the side profile also hindered.

Im curious what the physics behind this is. I have never tested to see but Im not sure I could duplicate exact chains without a grinder.

I don't get too carried away with gullet cleaning.
Just keep the big shelf from developing.

 

[huskihl]

Iirc I read a piece where it was stated taking back the gullet to far from the side profile also hindered.

Im curious what the physics behind this is. I have never tested to see but Im not sure I could duplicate exact chains without a grinder.

They were hypothesizing that a small shelf helped carry chips out

 

[p61 western]

They were hypothesizing that a small shelf helped carry chips out

And keep the cuts straight as well. Not to sure of it's true or not though.

 

[Duane(Pa)]

I was looking for the thread about the square chain competition that Madsen's sponsored. There were a few butt ugly chains that performed pretty well. Didn't find it, but this came up...
http://www.madsens1.com/PDF/RacingTechfacts_93099.pdf

 

[RI Chevy]

Good find sir.

 

[Hedgerow]

They were hypothesizing that a small shelf helped carry chips out

Or break chips off before they get too long..

Lotsa theories out there..

 

[Hedgerow]

I was looking for the thread about the square chain competition that Madsen's sponsored. There were a few butt ugly chains that performed pretty well. Didn't find it, but this came up...
http://www.madsens1.com/PDF/RacingTechfacts_93099.pdf

Couple things in there I’m on the fence about..

But still solid.

 

[Duane(Pa)]

Like a raker spec of .017"? It is from 1999 lol

 

[Hedgerow]

Like a raker spec of .017"? It is from 1999 lol

I could see high rakers on some saws..

Not so much on others.

 

[Chainsaw Jim]

They were hypothesizing that a small shelf helped carry chips out

The longer shelf is supposed to prevent the side cutter from getting enough of a bite. It sorta turns into a depth raker on the side. Madsens explains it on a different web page than the one mentioned above.

 

[concretegrazer]

Madsen's puts out solid info.

Definitely. But not everyone interpret's it the same.

 

[concretegrazer]

Iirc I read a piece where it was stated taking back the gullet to far from the side profile also hindered.

Im curious what the physics behind this is. I have never tested to see but Im not sure I could duplicate exact chains without a grinder.

I've seen an overcleared gullet work before. Lots of variables...

 

[concretegrazer]

I was looking for the thread about the square chain competition that Madsen's sponsored. There were a few butt ugly chains that performed pretty well. Didn't find it, but this came up...
http://www.madsens1.com/PDF/RacingTechfacts_93099.pdf

This one?

 

[Skeans1]

If you look at the corners of all those cutters only one doesn’t have a beak but is also the smallest sized cutting surface which would be great on a smaller cc saw with a long bar. A long gullet is just like a dull cutter I’ve left them long before and the chain will not cut at all even with a sharp cutter.


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[Chainsaw Jim]

Notice they omitted the fastest bucking chain... the only one that matters really.

 

[Terry Syd]

"They removed the gullets on some of the test chain and ran the tests again. Performance improved on all the chains when the gullets were removed." (on the third page of the article)

 

[wcorey]

A long gullet is just like a dull cutter I’ve left them long before and the chain will not cut at all even with a sharp cutter.

By 'long gullet', can I assume that's top to bottom and not front to back?



According to the madsens article, "They removed the gullets on some of the test chains and ran the tests again. Performance improved on all the chains when the gullets were removed."

So did just getting rid of the beaks make for the the improvement or was it that the gullets were moved back?

Terminology kills me when trying to understand some of this stuff, there's just no standard.
Almost as bad as cylinder porting...

I know what they mean in this instance but I still picture the gullet as the 'area' more or less below the top edge of the cutter, 'removing it' would separate the entire cutter from the chain, lol.
But that's just me...

 

[Skeans1]

By 'long gullet', can I assume that's top to bottom and not front to back?



According to the madsens article, "They removed the gullets on some of the test chains and ran the tests again. Performance improved on all the chains when the gullets were removed."

So did just getting rid of the beaks make for the the improvement or was it that the gullets were moved back?

Terminology kills me when trying to understand some of this stuff, there's just no standard.
Almost as bad as cylinder porting...

I know what they mean in this instance but I still picture the gullet as the 'area' more or less below the top edge of the cutter, 'removing it' would separate the entire cutter from the chain, lol.
But that's just me...

With square you have standard terminology, your gullet is the material left below my knife tip there. Depending on how big they are, wheel size, and wood sometimes you can get away with enlarging the wheel to drop them well grinding without fully removing them.

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[Chainsaw Jim]

You're actually pointing at the shelf. The gullet is the low area between the shelf and the raker.
The gullets are cleaned out, shelf is removed.

 

[Skeans1]

http://www.madsens1.com/bnc_gullet.htm

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