chainsaw
On 04/05/2021 19:36, NY wrote:
"The Natural Philosopher" wrote in message
...
It never occurred to me that it *might* be possible to sharpen the
blades on a chainsaw chain in situ, because of the problem of
rotating the chain slow enough to do each tooth in turn. I suppose if
you mark the teeth that are exposed and that you have sharpened, you
can run the chainsaw and stop it - and hope that sooner or later it
will stop with different teeth exposed.
?? you can move the chain without using the motor.
Maybe it's different with an electric (battery) chainsaw, which mine is.
If I grabbed hold of the teeth to pull the chain round, I think I'd rip
holes in my fingers before the chain moved at all. I wonder whether
there is a reduction gear between the motor and the chain sprocket which
makes it very difficult to drive it "in reverse" by pulling on the chain.
When the chain has got embedded in the wood (which happens
occasionally), it takes a lot of effort to pull the blade back to unwind
the chain from the notch that it's cut so far, to free the teeth. So
there's definitely not a freewheel action.
Ah. petrol saws have a centrifugal slippy clutch. So the motor never
stalls, and the blade stops on tickover.
--
€śThose who can make you believe absurdities, can make you commit
atrocities.€ť
€• Voltaire, Questions sur les Miracles Ă* M. Claparede, Professeur de
ThĂ©ologie Ă* Genève, par un Proposant: Ou Extrait de Diverses Lettres de
M. de Voltaire
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