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I had to take a big limb off an oak tree couple years ago. it was amazing how fast that hard wood dulled the blade. the live oaks here in Texas are no joke.
(this last fall I was trying to split the wood as it was dry, and I learned why people don't split live oak. you just have to chip little chunks off the side.)
yeah the oak is no joke... is a serious wood.
Today I had a fallen birch, quite fat, like 40 cm in diameter and 15m long.
It was already pretty dry, but I started with an old chain, cleaning the branches. So I saw that the sawdust wasn't so big... that is sign that the chain is not sharp.
So I remember I have a spare new chain and change it. Totally awesome.
In 1h the whole tree was cut in pieces and piled up in the storage.
Exactly! And the cuts are really fast now.
Now I have to sharpen the old chains I put aside, to have them as backup.