Can I Swap outer Dado blades? - Woodworking Talk - Woodworkers Forum
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post #1 of 7 Old 12-19-2009, 09:20 PM Thread Starter
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Can I Swap outer Dado blades?

I am wondering if it's possible to swap the outer blades on my Amanda Dado set , 24T, with the 80 tooth fine blades I have. I want to produce a fine finish edge while cutting 3/4" oak finished ply without chipping the edges on cross grain cuts. The set works beautifully except for the chipping on the ply cross cuts. I know that there will be blade thickness differences, but will I be creating more problems? Is there a safety issue in doing this?

Thank you for your help.

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post #2 of 7 Old 12-19-2009, 09:29 PM
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i dont think it will work.....

Most( i think all) dado sets are either 6" or 8". Unless you have a 6" or 8" blade it wont work right. I would invest in a higher quality dado set, like a forrest or a CMT. You could also try a slow feed rate and take a very shallow first pass. Maybe a 1/16", then follow back with your final depth cut. Try taping the cut with some blue painters tape before cutting also.

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post #3 of 7 Old 12-19-2009, 10:26 PM
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What am I missing here?

Obviously the blades have to be the same diameter 6", 8" or what ever.
The best way is to test it on a sample. the chippers will still remove the area between the outside blades and the 80 T blades should give far less chip out on the crosscut. The painter's tape is still a good idea regardless. Nothing is going to blow up here. but take a 1/4" cut to see how it works. bill

The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)
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post #4 of 7 Old 12-19-2009, 10:33 PM
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If you have the same diameter outer blades to swap out and if the chipper teeth don't interfere with the outer teeth. I don't see why it wouldn't work. Put it on and do a test, if it leaves a flat dado you are in. If not, I guess you have to deal with some chip out.

I have a Freud dado set and it has 24 tooth outer blades. I have no problem with chip out on cross grain plywood cuts. My dado has a negative 5º hook on the teeth.

Measure Twice Cut Once -- It's a lot easier to cut more off then it is to cut MORON.
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post #5 of 7 Old 12-19-2009, 11:05 PM
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Robert - The outer blades on most dado sets have beveled tops on the teeth that angle in from the outside to the inside. They protrude slightly above the flat top teeth of the's intentional to reduce tearout, but they do leave tiny grooves at the very outside of the dado....aka "bat ears". Your 80T blade likely has alternating bevel top teeth, which will leave a double groove where each 80T blade is used. You're likely to also find that the diameter of the blades are not exact, which is really just going to leave a very sloppy bottom.

In a nutshell, I wouldn't do it. Have you tried using a backer board to prevent tearout? You could also try taking a very slow, very shallow dado cuts, and work your way up to the desired depth. You could also try using one 80T blade to score your dado to just below the full depth, then use the stack to complete it.

I'm using an Infinity Dadonator set, that has 24T cutters and 6T does pretty well in ply.
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post #6 of 7 Old 12-19-2009, 11:29 PM
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Try a piece of scrap

Shouldn't hurt
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post #7 of 7 Old 12-20-2009, 08:36 PM
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The higher quality dado blades like Forrest and Freud will have been machined as a set so that all diameters are within very close tolerances. So even if you have the "same diameter" blades, the absolute true diameter will most likely still be different and the likelyhood of flat dado bottoms is IMHO, very unlikely. EVEN if you swapped outer blades with another set from the same manufacturer.

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