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6 inch or 8 inch dado blade?

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Forum topic by fl13 posted 08-21-2014 01:43 AM 1205 views 0 times favorited 3 replies Add to Favorites Watch
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fl13

6 posts in 851 days


08-21-2014 01:43 AM

Is there any advantage to using a 8 inch dado set vs. The 6 inch sets? I have a Rigid table saw which serves me well for the normal day to day cutting tasks that I do. I did notice that while I was cutting qtr. Inch box joints with a jig using 3/4 inch mahogany that the cutting seemed a little stiffer than usual. I was using a 6 inch set.
8 inch a better choice? Including the sled base the depth of cut was 1.25 inches. I usualy use dado sets for shallow cuts , or utillize the router .

fl13

-- Fred


3 replies so far

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knotscott

7216 posts in 2842 days


#1 posted 08-21-2014 09:42 AM

A 1.25” deep dado is pretty deep. An 8” set has faster tip speed, and deeper cut than 6”, but the 6” sets tend to be easier to spin. However, it’s very important to note that there’s a lot more going on with each specific set than the diameter. They’re not all created equal, so depending on the particular set involved, it’s very possible to get superior performance from an excellent 6” set vs a mediocre 8” set and vice versa. The variables can include sharpness, design parameter differences, cleanliness, etc. Overall, I’d say a high quality dado set is a better choice than a mediocre set, and in general I prefer a good 8” set to a good 6” set, but 6” sets can cost less, and are a good choice if you have a lower powered saw.

Low quality sets just aren’t worth bothering with IMO (Mibro, Avanti, Oldham, Craftsman, etc)....I much prefer to stick with better sets from Infinity, Forrest, Ridge Carbide, Freud, CMT, Amana, Tenryu @ ~ $200+....the Delta/DeWalt 7670 set represents a ncie bang for the buck if you can find it in the $100-$120 range. Oshlun, Avenger, Freud’s 208, Irwin Marples, and CMT ITK tend to offer good value too for ~ $75- $100.

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

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fl13

6 posts in 851 days


#2 posted 08-21-2014 10:11 AM

Thanks for the input, 1.25 inch cut was including the .5 inch base on the homebuilt Stumpy Nubs box joint jig that I just built. Prior to this project, I had been cutting some 1/ 4 inch hardwood faced plywood. The set was a $ 50 dollar Avenger set that was on sale at Rockler, I was actualy looking for the Freud box joint set since I wanted to keep the joints to no wider than 3/8 . I think also that another issue was that I may have been pushing the sled a little to the left which created a bit of binding. The set seems to make decent relatively flat bottom cuts otherwise. I am open to purchasing a better set. I noticed that HD had a Diablo 8 inch set for under 100.00. It is made by freud if I am not mistaken. For the most part I want to build a few projects using box joints , I am limited to 3/4 inch stock since I do not have thickness planers etc.
Fl13

-- Fred

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knotscott

7216 posts in 2842 days


#3 posted 08-21-2014 12:42 PM

AFAIK, Avenger is associated with Oshlun and have comparable designs. Both offer a couple of different levels, but from what I’ve read and seen of test results, your Avenger should be pretty comparable to the Freud SD208 set, so not worth swapping for. An upgrade to something like the Freud SD508, Infinity, Ridge Carbide, or the Delta/DeWalt 7670 might be worth it, but will obviously be more expensive.

The box joint sets are a little different animal than dado sets…they tend to work better for box/finger joints, but not as well for cross grain grooves. The box joint sets are also less versatile than a dado.

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

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