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How Much can a blade affect a miter cut.

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Forum topic by Rookie702 posted 657 days ago 758 views 0 times favorited 20 replies Add to Favorites Watch
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Rookie702

42 posts in 881 days


657 days ago

I’ve been trying to cut some 45 degree miters for some boxes i’m making for a girlfriend, and i’m having a hell of a time getting a straight miter.

How much effect will a dull blade have on the miter cut. I’m using maple so the wood is pretty hard. and it seems like like i get a bow in the miter when looking at it from its edge. These miters are 4-6 long. I tried some cedar, and it seems like these came out much straighter, was this because the wood is softer.

Can anyone recommend a quality blade, how many teeth?


20 replies so far

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MonteCristo

2094 posts in 792 days


#1 posted 657 days ago

If the blade is dull, it should burn the maple while cutting, plus be hard to pull thru the maple. I am wondering if there is some slop in the saw carriage for you to be getting such a cut. Have you tested to be sure it’s not an optical illusion ?

A dull blade will also cause chipout, especially at the ends of the cut.

-- Dwight - "Free legal advice available - contact Dewey, Cheetam & Howe""

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patron

12976 posts in 1945 days


#2 posted 657 days ago

clean and sharp
is what works best

and stops or clamps
to keep the wood from ‘creeping’

i never use thin kerf blades
for just this reason

i know some like them
but to me they are just a marketing ploy
to use less steel
and jack the price
for ‘new and improved’

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

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knotscott

5371 posts in 1979 days


#3 posted 657 days ago

A high quality sharp blade that’s appropriate for the task is critical. Are you using a miter saw or a table saw?

Let us know what saw you’re using, and I’m sure someone can give you a good blade suggestion.

-- Happiness is like wetting your pants...everyone can see it, but only you can feel the warmth....

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Rookie702

42 posts in 881 days


#4 posted 657 days ago

I was just reading a forum topic on clean blades, and i can honestly i have never cleaned a blade in my life, guess i’ll start tonight. I only woodwork as a hobby so my table saw and blades dont get that much use, just a couple of times of week so i think my blades are dirty and but still sharp.

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crank49

3343 posts in 1575 days


#5 posted 657 days ago

Another important effect is whether there is damage to the blade.

If, for instance one edge clipped a hidden nail or staple and got chipped at some time in the past.
This will make the blade try to cut at an angle, but the bearings and shaft are fighting to keep it straight.
The result is some interesting warpage in the blade in the cut; might even look like a wave pattern.

-- Michael :-{| “If you tell a big enough lie and tell it frequently enough, it will be believed.” ― A H

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Grandpa

3055 posts in 1279 days


#6 posted 657 days ago

A blade that is designed for a miter saw is critical. I loaned my saw to a friend. When it came home it had a different blade on it. It was recently sharpened and all but it was not a saw blade for that kind of work and you could not make two 45 deg cuts come together and close up or enven make a 90 degree angle. A new blade took care of that.

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Rookie702

42 posts in 881 days


#7 posted 657 days ago

I’m using a JET 10” Contractor Saw, just purchased in May of this year, and i’ve setup the saw as best as i know how, plus have incra miter gauge.

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knotscott

5371 posts in 1979 days


#8 posted 657 days ago

If cleaning your current blade doesn’t help, or if the current blade isnt’ a high quality blade, I’d definitely look to a new one. Considering the task, I’d opt for a full kerf blade to reduce the chance of deflection (though I do think a high quality thin kerf blade for many TS operations are fine).

Without knowing your blade budget, I’ll start with some bargains….the Delta 35-7657 40T ATB general purpose blade is still on sale through Cripe or Amazon for < $30 shipped. This German made Onsrud 50T blade is ~ $25 shipped. For ~ $70, the Infinity Combomax is the best of the 50T blades I’ve used. Nearly any high quality 40T to 60T 1/8” full kerf blade should do well if it’s suitable for TS.

-- Happiness is like wetting your pants...everyone can see it, but only you can feel the warmth....

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Rookie702

42 posts in 881 days


#9 posted 657 days ago

Budget. what’s that?, when it comes to tools and hobbies for me if i want it and need it i pretty much get it. The mortgage company can wait. Haha…as far as blades, i’ve purchased 10 or 11 blades thinking they were all dull, i’m so excited to get home and clean my blades and hopefully they work again.

whoohoo

View patron's profile

patron

12976 posts in 1945 days


#10 posted 657 days ago

read up on the different blade types

they all have different purposes
designed for different tools and cuts

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

View Sgt374's profile

Sgt374

36 posts in 1198 days


#11 posted 657 days ago

What usually happens is the blade is dull and the maple is hard so you force the saw through the cut and the blade deflects and the wood pushes to the side giving you a bad cut. That’s why a sharp, clean, crosscut blade is necessary.

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Rookie702

42 posts in 881 days


#12 posted 657 days ago

I have sandpaper against my fence and i can’t see it move or feel it move, but it sounds like the wood still is moving without me noticing is that correct?

View knotscott's profile

knotscott

5371 posts in 1979 days


#13 posted 657 days ago

A dirty blades acts like a dull blade, and actually causes premature dulling. Definitely keep them clean!

It’s possible that your blade is actually deflecting during the cut. There are few things that can cause that. We know you’re using a Jet contractor saw, but not what blade you’ve been using.

-- Happiness is like wetting your pants...everyone can see it, but only you can feel the warmth....

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mrg

520 posts in 1603 days


#14 posted 657 days ago

Is the blade adjusted high enough? If the blade is not high enough you will get a dished cut.

-- mrg

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Rookie702

42 posts in 881 days


#15 posted 657 days ago

Is the blade adjusted high enough? If the blade is not high enough you will get a dished cut., ummm this might be the cause of some of my problems, as i was trying to keep the blade as low as possible in an effort to minimize any kind of deflection. Your term “dished” made sense to me and after thinking about the blade etc, this could be the case..thank you.

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