Author Topic: Asymmetrical Chain  (Read 145 times)

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Offline 660magnum

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Asymmetrical Chain
« on: July 30, 2013, 06:01:22 pm »
The real lesson here is LOOK AT YOUR CHAIN!

I bought a Stihl 025 from Cut4fun a couple years ago. It was a chainsaw that he had taken in on trade for a larger chainsaw.

I don't think he used it more than a trial cut or two. The only thing changed from original on it was that the outlet hole in the muffler behind the screen holder was enlarged.

A very nice - like new, homeowner chainsaw with 16" bar and .325 X .063 chain.

So I've had it a couple years. When I first bought it, I put a new twin needle carb on it that cost a little more than $22 from the Stihl dealer.

At the time I was taking down four 16" DBH yellow pine trees. I used the Stihl 025 to buck the trunks. The chain performed like it was sharp and the chainsaw had good power.

I have a lot of chainsaws so I don't use every one that I own every day. Fast forward to November 2012 I took the 025 to cut4fun's house and ran it against a 40cc Echo of which there was no comparison. May 2013, I did a little limbing on a Ash that I took down just to use it some. The 025 performed as expected. I used it along with a 026.

Now in July 2013, I went around my 2 acres and trimmed some low branches from the trees along the property line for which it performed fine.

So I thought I would touch up the chain which looked pretty good. This chain loop has two right hand cutters together at the junction point and I started filing the first left hand cutter beyond the junction. After doing some three left hand cutters, I noticed the damaged right hand cutters. They were damaged by a grinder. The grinder had come down about the first 1/16" into the top plate of the cutters for a depth of about 1/16". About half of the right hand cutters were this way. I was embarrassed of myself for not having seen this! I don't see how it cut so well to not show up by cutting to one side?

Anyway, It took 20 file strokes to restructure the first bad right hand cutter so I gave all the cutters 20 strokes. That was a lot of filing. I was using a Oregon Professional Clamp on sliding file guide but that was a lot of work after I finished the rakers.

Sharpening and correcting the chain, the Stihl 025 cuts just as good as it did before. In reality, several timed cuts in a clear cant - before and after sharpening - would show differently?
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That knowledge can live after us... and that "Pays It Forward".
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Offline Cut4fun .

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Re: Asymmetrical Chain
« Reply #1 on: July 30, 2013, 06:46:37 pm »
Interesting. Never paid attention to the 325 chain on that saw that came in on trade. My PP260 is long gone now that I tested it against with PS3.

Have seen alot of chains with 2-3 cutters in a row like 2-3 lefts or 2-3 rights though.   

When I am making chains I try to keep everything even if I can like those  I done up in square for yea.
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Offline 660magnum

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Re: Asymmetrical Chain
« Reply #2 on: July 30, 2013, 07:15:18 pm »
I looked at it a couple times in those two years but must have been looking at the good area?

Those Oregon CL  square chains were nice.
We should share what we know... someone may learn...
That knowledge can live after us... and that "Pays It Forward".
Be all that you can be . . .

 

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