Reply by Cosmicsniper

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Posted on Saw blades 10" V 8"

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2202 posts in 3186 days

#1 posted 09-09-2011 04:03 PM

Certainly, you can use it on occasion. However, I wouldn’t gain too much comfort in it being easier to spin than a 10” blade. I know that my 3hp TS wouldn’t think twice about it.

I think there are three reasons a larger blade is better. First, the larger the diameter of the blade, the faster the cutting teeth will be moving through the wood. In fact, an 8” blade would moving at only 80% the speed of a 10” blade at the cutting edge. A 6” blade would be moving at 75% speed of an 8” blade. A 6” blade would be moving at 60% speed of a 10” blade. You get the idea.

Second, run-out (wobble) will likely be a larger factor with smaller blades because they are, in fact, smaller and thinner. This is especially true when pushing smaller blades through some hardwood. Again, the motor doesn’t care what blade is on it…so when the blade encounters resistance, the energy build-up either goes into the wood OR back into the blade (usually in the form of lateral movement/flexure). And because the smaller blade is at a speed handicap already, then you will encounter more resistance for a given cut.

In other words, when I used a knife or handsaw growing up, my Dad would always say, “Let the tool do the work.” Sure enough, you always get better cuts when you move the teeth through the wood, not trying to do it solely with brute force. I think the same thing applies here. Torque doesn’t matter if it can’t produce energy at the tip of the blade…and, IMO, I think the larger blade is more capable in that regard.

Third, saw blade designers go through a LOT of research to optimize their products for a given saw, including kerf designs, tooth angles/bevels, etc…none of which I’m as qualities as Knotscott to comment on. So, you should probably expect the best performance on a 10” table saw to be delivered by a 10” blade.

But for certain applications, I have no problem going with a small blade, though I seldom do that personally. That’s why I have so many different 10” blades!

My $.02!

-- jay,

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