Dead dado

  • Advertise with us

« back to Power Tools, Hardware and Accessories forum

Forum topic by RusticElements posted 09-17-2008 09:59 PM 1387 views 0 times favorited 15 replies Add to Favorites Watch
View RusticElements's profile


167 posts in 3754 days

09-17-2008 09:59 PM

Topic tags/keywords: question pine tablesaw joining

I purchased a new dado set so I could work on my beehive project. So far I’ve only made enough box joints with the set to make 6 hives and it is so dull it’s almost unusable. Is this normal? It’s a $100 Diablo set cutting pine.

-- Michael R. Harvey - Brewster, NY - - -

15 replies so far

View Steelmum's profile


355 posts in 3991 days

#1 posted 09-17-2008 11:11 PM

Cutting pine, the first thing I would check for is pitch on the blades. I would take them off and clean them. You can buy a chemical spray to clean pitch off of blades. It burns my skin. I use WD-40, let it soak and if it needs it I brush it a little with a brass bristle brush. Cleans stuff right up. Wipe it off, reinstall it and you should be good to go.

-- Berta in NC

View Tony Z's profile

Tony Z

205 posts in 3818 days

#2 posted 09-17-2008 11:17 PM

Ditto on Steelmum’s comment. I bought the Rockler blade cleaning kit but have yet to use it. It was on sale recently for about 18 bucks. I hear it works well.

-- Tony, Ohio

View Grumpy's profile


23997 posts in 3879 days

#3 posted 09-18-2008 12:01 AM

Michael, some use oven cleaner. I have heard it works well.

-- Grumpy - "Always look on the bright side of life"- Monty Python

View Scott Bryan's profile

Scott Bryan

27250 posts in 3850 days

#4 posted 09-18-2008 12:16 AM

I use both the Rockler product and oven cleaner. Both work well. I tend to like the oven cleaner better since I just spray it on and put the blade outside for 10 to 15 minutes (a good excuse to spend some time in the shop) and rinse it off. Dry the blade with shop towels.

But to answer your question I don’t believe that the dado set should be dull yet. I have a Forrest dado set that I bought 5 years ago and it is still sharp despite a lot of use since I do all my rabbeting and dadoing on the ts.

-- Challenges are what make life interesting; overcoming them is what makes life meaningful- Joshua Marine

View Bob #2's profile

Bob #2

3809 posts in 4050 days

#5 posted 09-18-2008 12:52 AM

Do you have the blades in the setup running the right way?
The sharp edges should face you when you are in front of your saw.


-- A mind, like a home, is furnished by its owner

View DocK16's profile


1184 posts in 4115 days

#6 posted 09-18-2008 01:13 AM

Something else is wrong here, that’s really not enough cutting to get pitch build up unless you’re using green wood. This may sound idiotic but check to make sure the blade is mounted so the blade is rotating in the proper direction. I made the mistake of putting a wobble dado (not a word about my wobble dado LJ’s) on with the teeth facing the wrong direction. Got alot of burning and difficult cutting to say the least. IF there is visible pitch build up there are any number of products to remove it. Cheap alternative is denatured alcohol or acetone. Steel mum is right wrap in paper towels and let is soak and use a brass brush.

-- Common sense is so rare anymore when you do see it, it looks like pure genius.

View DocK16's profile


1184 posts in 4115 days

#7 posted 09-18-2008 01:14 AM

Ah yes now I see Bob’s post must have come in while I was typing. Glad I wasn’t the only one who has done this

-- Common sense is so rare anymore when you do see it, it looks like pure genius.

View cmaeda's profile


205 posts in 3582 days

#8 posted 09-18-2008 07:10 AM

If the blades are the right way and the blades are clean, it is possible that the blades are dull. This can happen if you’re trying to cut too deeply and your tablesaw doesn’t have the power to support the cut. Did you get a lot of burning? The heat will make the blades dull more quickly.
Try taking less out with each pass if this is the case.

View HokieMojo's profile


2104 posts in 3756 days

#9 posted 09-18-2008 03:45 PM

I too installed backwards when making a zero clearance insert. couldn’t figure out the smoke at first. Apparently this is a more common mistake than it should be! lol

View sIKE's profile


1271 posts in 3782 days

#10 posted 09-18-2008 07:10 PM

Also make sure the outside blades are mounted properly, I had a couple of projects where the bottom edges of my dados had ramps. If you are cutting through real pitchy material see above about cleaning but I like to use Krud Kutter, you can get it a the orange Box. Make sure that no matter what you use you give it a good rinse with water an dry it (I like to use my airhose.

-- //FC - Round Rock, TX - "Experience is what you get just after you need it"

View hasbeen99's profile


183 posts in 3567 days

#11 posted 09-18-2008 08:53 PM

Just to add to the pitch cleaning effort, I’ve also heard Simple Green works well to remove pitch from saw blades and router bits.

-- "The only thing that counts is faith, expressing itself in love." --Galatians 5:6

View RusticElements's profile


167 posts in 3754 days

#12 posted 09-20-2008 01:37 AM

Thanks for all the info guys. But do you think I’m dumb enough to put the blades on backwards? Well, OK, I am dumb enough. I did it a couple weeks ago. Took me a while to figure out why it was cutting poorly and making a lot of smoke. Unfortunately, that wasn’t the case this time. After last time (I do learn sometimes ;)), that was the first thing I checked.

I used acetone and a brass brush, because that’s what I happened to have on hand. Made a big difference. Not like new, but much better.

-- Michael R. Harvey - Brewster, NY - - -

View Darell's profile


434 posts in 3622 days

#13 posted 09-20-2008 01:44 AM

I use any of those orange cleaners. Cheap, safe and it works.

-- Darell, Norman, Ok.

View TomK 's profile


504 posts in 3902 days

#14 posted 10-01-2008 11:32 AM

I agree with Darell. Orange oil works, its “green” and you can pour the remnants over fire ant mounds!

-- If you think healthcare is expensive now, wait until it's free! PJ O'Rourke

View juniorjock's profile


1930 posts in 3793 days

#15 posted 10-01-2008 03:50 PM

I’ve been using Krud Kutter to clean my blades. It’s a liquid concentrate used with pressure washers. Just a couple of caps full with some hot water and let the blades soak for a few hours. Brush off with a nylon brush, rinse and they’re like new.

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics