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Clean Dado Blade cuts

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Forum topic by lighthearted posted 05-11-2010 02:23 PM 3103 views 0 times favorited 11 replies Add to Favorites Watch
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lighthearted

142 posts in 2776 days


05-11-2010 02:23 PM

Topic tags/keywords: dado tenon

My Dado Blade has not been giving me clean cuts as shown here on this tenon. The tenon is striped and uneven.
I should be able to achieve a cleaner cut correct? What am doing wrong?
I have a Freud 8” Dado set. In this case I was using all the blades, with no spacers.

-- Chris http://thelightheartedwoodworker.com/


11 replies so far

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lighthearted

142 posts in 2776 days


#1 posted 05-11-2010 02:34 PM

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ChuckV

2880 posts in 2990 days


#2 posted 05-11-2010 02:41 PM

Is the piece of wood flat? If not, and it is able to rock a little bit on the table saw, it will be difficult to get the depth of the cuts to be consistent. As you move the piece and change the placement of your hands to make the multiple passes over the dado blade, this could happen.

-- “Big man, pig man, ha ha, charade you are.” ― R. Waters

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lighthearted

142 posts in 2776 days


#3 posted 05-11-2010 02:47 PM

flat as, well, a board ;)

-- Chris http://thelightheartedwoodworker.com/

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richgreer

4541 posts in 2537 days


#4 posted 05-11-2010 02:54 PM

Freud makes several different dado sets of varying quality and price. Nonetheless, even their cheapest set should do better than this.

My first guess is that the blade is not set at 90. If not, I would take a hard look at the cutters to see if you have one or more that are defective.

-- Rich, Cedar Rapids, IA - I'm a woodworker. I don't create beauty, I reveal it.

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Sawkerf

1730 posts in 2531 days


#5 posted 05-11-2010 02:58 PM

Looks like your cutter isn’t quite at 90*.

You may also be using too much (or too little) pressure on the board as you make your cuts. Unlike a machinist, we work with fairly flexible materials, and do many of our operations with just hand pressure – which is usually inconsistent and/or uneven. This is often the source of those small but annoying “glitches” in our cuts.

-- Adversity doesn't build character...................it reveals it.

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Michael Murphy

452 posts in 2468 days


#6 posted 05-11-2010 04:52 PM

Has the set been sharpened ever? Looks like one of the Blades or one chipper is bigger than the others. Maybe the sharpener forgot to grind one outer cutter. All the blades and chippers need to be the same diameter.

-- Michael Murphy, Woodland, CA.

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knotscott

7211 posts in 2838 days


#7 posted 05-11-2010 06:24 PM

Chris – What saw do you have? If it’s an older Craftsman or a newer Ridgid TS3650, it could be the saw’s arbor.

Another question…how many passes were used to make the cut shown?

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

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lighthearted

142 posts in 2776 days


#8 posted 05-11-2010 07:40 PM

@knotscott—Five I believe. Hitachi.

@Michael—Dado set is not old—never sharpened.

I do believe it was 90 deg. I hear what you are saying about the pressure, but it is awfully consistent.

-- Chris http://thelightheartedwoodworker.com/

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jsheaney

141 posts in 3451 days


#9 posted 05-11-2010 08:09 PM

I have the same problem with my CMT set, which was not cheap. I’m not too concerned about it because I always do the final fit with a shoulder plane (thinking about getting a rabbet plane). I actually suspect that these grooves help distribute the glue better, but that could be a rationalization. :)

I would guess that it is one chipper or one blade that is causing the problem. Try some test cuts with just the two outer blades and then add chippers one at a time. You might be able to identify one as the culprit. Maybe there’s a ding in one tooth. I can’t imagine your arbor being a problem. My dado set fits so tight I have trouble getting them off.

-- Disappointment is an empty box full of expectation.

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knotscott

7211 posts in 2838 days


#10 posted 05-11-2010 08:11 PM

One way to narrow it down is to make some test cuts using only the two outside cutters, then start adding a chippers one at a time until the striping shows up.

It could be a problem with the set, and Rich is correct…even their entry level $90 set should cut better than that. I believe Freud has a lifetime warranty on their cutters?

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

View Reuben's profile

Reuben

4 posts in 2396 days


#11 posted 05-16-2010 03:21 AM

Your dado set is operating as it should. The lines are caused by the beveled teeth on the outside blades. Take a single pass and look closely at the edges of the cut and you’ll see the little lines in the corners. You might want to try a box joint set instead. They have flat teeth.

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