Freud 6" dado set not flat???

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Forum topic by scribble posted 04-26-2014 11:49 PM 1560 views 0 times favorited 12 replies Add to Favorites Watch
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176 posts in 2200 days

04-26-2014 11:49 PM

Topic tags/keywords: tablesaw question

I have had this Freud 6” dado set for about 3 years and didn’t realize my current saw could use it until recently. I decided to try it out by cutting dado’s for my drill press fence tracks. I set it up for 3/4 which was a little snug yet but gave it a test run. I have nothing even remotely resembling flat bottoms on my cuts. Its as it the stacks are missing sections. If I were to do a dado for a shelf you could see 1/32-1/16” gaps in the joints.

I am thinking I am doing something wrong but maybe I am expecting too much from this set.

-- If you can't read it Scribble wrote it!! “Experience is merely the name men gave to their mistakes.”

12 replies so far

View woodchuckerNJ's profile


1274 posts in 1633 days

#1 posted 04-26-2014 11:58 PM

Pics would help…

-- Jeff NJ

View Dusty56's profile


11819 posts in 3687 days

#2 posted 04-27-2014 12:11 AM

Do you have the blades correctly oriented ?

-- I'm absolutely positive that I couldn't be more uncertain!

View Ingjr's profile


144 posts in 3015 days

#3 posted 04-27-2014 12:45 AM

Only the more expensive sets leave flat bottoms. Really there are only a few that do.

-- The older I get the faster I was.

View scribble's profile


176 posts in 2200 days

#4 posted 04-27-2014 01:05 AM

Here are the 2 cuts I made recently at different depths in 1/2 ply, and the dado stack as setup for 3/4”

These are the 2 best cuts I have gotten. I may just being overly picky?

-- If you can't read it Scribble wrote it!! “Experience is merely the name men gave to their mistakes.”

View NormG's profile


6112 posts in 3003 days

#5 posted 04-27-2014 01:14 AM

My old craftsman set is dead flat

as are my Freud Sbox8 set

-- Norman - I never never make a mistake, I just change the design.

View hoosier0311's profile


706 posts in 2024 days

#6 posted 04-27-2014 01:27 AM

Could this be a bearing problem in the arbor? I remember reading that a little bit of slop shows up bad when the width of the cut is increased. Are the uneven grooves consistent or do they move around a bit.
I have an old craftsman set handed down from grandpa, they cut flat.

-- atta boy Clarence!

View a1Jim's profile


117091 posts in 3576 days

#7 posted 04-27-2014 03:06 AM

I’m thinking along the lines of Hooser worn out bearings or undersized arbor.

-- wood crafting & woodworking classes

View woodchuckerNJ's profile


1274 posts in 1633 days

#8 posted 04-27-2014 03:06 AM

I don’t see the problem in those pics.
What I see are slight marks… where the points come down and leave scoring marks.
I wasn’t able to see 1/32 to 1/16 which would be a huge difference.

-- Jeff NJ

View knotscott's profile


8014 posts in 3374 days

#9 posted 04-27-2014 12:07 PM

The scoring marks are pretty normal for that particular set with the two-tooth chippers…..their SD508 and SD608, and some of the more expensive sets like the Dadonator, Forrest, Ridge Carbide, and DW/Delta 7670 have four-tooth chippers (or more) and leave a smoother bottom. All of the dado sets I know of leave slight grooves along the edges….aka “bat ears”. Those grooves are intentional for dado sets, and help reduce tearout on cross-grain cuts. It’s possible to buy a box joint set intended for with-grain cuts that won’t leave bat ears, but will likely have more tearout on cross-grain cuts.

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

View Fred Hargis's profile

Fred Hargis

4986 posts in 2492 days

#10 posted 04-27-2014 02:13 PM

Doesn’t look unusual to me, either. The bat wings (devil’s ears, whatever) are common. Some sets cut them a little shorter but the tooth profile needed for a smooth exterior cut dictates the need for it. If I need a dead flat dado I’ll switch to a router. You can get special bits that are just for flattening the bottom of a saw cut dado.

-- Our village hasn't lost it's idiot, he was elected to congress.

View MrRon's profile


4769 posts in 3242 days

#11 posted 04-28-2014 06:20 PM

This site will tell you how to set up the different types of dado sets. Note: The better sets will have the teeth of the outer blades set in one direction only. The teeth should face out. The photo by knotscott shows a cut made by a quality set. A good set will usually cut “bats ears”. the chippers will always be set a few thousands lower than the the outside scoring blades.

View buildingmonkey's profile


242 posts in 1546 days

#12 posted 04-30-2014 02:34 AM

I bought an Oshlun 8” dado from Carbide processors, it has the bat wings, but very clean edges in plywood. They all leave a little texture on the bottom, but mine is very good. Sort of have to “screw the blades onto the arbor, they fit tight! It was only 85 with free shipping.

-- Jim from Kansas

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