UKTC Archive

RE: Chainsaw sharpener

Subject: RE: Chainsaw sharpener
From: oldoaktree
Date: Jun 08 2019 16:42:57
I think these are a totally different shape of cutter which can be ground 
down to sharpen them, but is certainly not the optimal shape of cutter as 
seen on a full chisel or semi-chisel chain which would never be sharpened on 
such a machine.

I could imagine it could easily get fired off the end of the saw and go 
through someone's window with just a small slip. It would make very enjoyable 
viewing!

Cheers

Dave

-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info <uktc-request@xxxxxx.tree-care.info> 
On Behalf Of Simon Pryce Arboriculture
Sent: 08 June 2019 11:30
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: Re: Chainsaw sharpener

I've heard of those systems but I don't see how you can sharpen a saw by 
grinding the top while its running.  Saw teeth need to be higher at the front 
than the back, so there is clearance behind the cutting edge, if you look at 
a chainsaw tooth sideways on its a noticeable angle and is why you need to 
reduce the height of the guides periodically. And it will take off the chrome 
layer that makes it sharp.  I've run chainsaws into stone, bricks, concrete 
and all sorts of other things, that never made them cut better.

Circular saws are a bit different.  If they go out of round after a time, 
usually due to bad sharpening, they can be trued by taking the points of the 
teeth down with a stone while the saw's running.  However that only brings 
the the teeth to the same height, it is then essential to file the tops down 
at the original angle to restore the point and clearance.  That's simpler 
than I've made it sound.

Simon





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