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Dull blade close up

visual close up of dull circular saw blade next to brand new sharp carbide tip never before used

The main symptom of a dull circular saw blade is the motor bogging down making cuts harder to push through.

Above is a side by side comparison of our old 12 amp Skil saw blade and a brand new carbide tipped blade.

Maybe a circular saw from the future will have a feature where it scans each tooth and shuts down or beeps when the dullness is too much for the motor to handle.

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The old saw looks like plain steel. If you decide to sharpen that, take care not to overheat it. If the tip of the tooth is discolored after grinding, it might have changed its temper and become less suitable for a saw.

Saws already have a built-in guard against dull blades; it's called a fuse. :-) If the saw is really blunt, the motor starts drawing too much current and the fuse will melt and break the circuit. Which is a good thing, otherwise the windings in the motor might short-circuit as the nonconductive coating on the wires degrades because of the heat.

Comment by Roland_Smith Sun Sep 9 17:01:49 2012

Thanks for the grinding tip. Will take care not to heat the metal up too much by keeping each pass quick and maybe pausing in between.

I think the 12 amp saw still has a viable motor, it's the mechanism that keeps the blade tight that either got overworked or was faulty to begin with.

Comment by mark Mon Sep 10 12:18:53 2012
What kind of mechanism for retaining the blade did the 12 amp saw use? If it is just a bolt and there are no plastic parts between the bolt and the saw it should be very hard to over-tighten it. (not impossible though, if your wrench is long enough)
Comment by Roland_Smith Tue Sep 11 17:04:43 2012

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