There's several methods for tensioning blades, and it depends on what
blade you're using as well as your saw. To summarize:
The "pluck" method: The blade is tensioned until there is a clear note
heard from the blade when it has been plucked with a finger.
The flutter method: The blade is set to some initial tension then the
saw is turned on. The tension is adjusted until the blade flutters then
stops fluttering. You'll have to do some reading on this, as this is
only a very basic description of the method. I believe Timber Wolf
blades recommend this method.
The "press" method: The blade is tensioned until pressing the blade
gently results in a certain amount of deflection.
Checking the gauge on the back might be effective as well, but the gauge
doesn't really measure anything. It essentally shows you how much your
spring is compressed, but not the pressure it's exerting on the blade.
If your saw is in good condition, there's no reason this won't work
What works for me is to start with the "built in" tension gauge on your
saw. Test cut, tighten a bit, test cut, is it better, worse?
As blades wear they require different settings. Use your built in gauge
as a starting point and tweak from there.
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