Flat Top Grind 10" Saw Blade

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Forum topic by rlrjr posted 08-11-2011 08:09 PM 7062 views 0 times favorited 8 replies Add to Favorites Watch
View rlrjr's profile


65 posts in 2834 days

08-11-2011 08:09 PM

Does anyone know where you can buy one of these things? I’ve been to every big box store, Harbor Freight and all over the web and I cannot find one…....I need one to put keys on mitered corners….all the blades I can find have alternate tops which leaves a small triangle at the bottom of the groove when you cut it on the saw.

-- When I works, I works hard. When I sits, I sits loose. And when I thinks I falls asleep.--

8 replies so far

View gizmodyne's profile


1779 posts in 4084 days

#1 posted 08-11-2011 08:29 PM

Freud makes a straight line rip blade. That is what I bought for the same purpose (miter keys).

-- -John "Do I have to keep typing a smiley? Just assume it's a joke."

View David Kirtley's profile

David Kirtley

1286 posts in 2992 days

#2 posted 08-11-2011 10:40 PM

You could also use one blade from a stack dado set.

-- Woodworking shouldn't cost a fortune:

View sawdustphill's profile


53 posts in 2685 days

#3 posted 08-11-2011 11:06 PM sell a blade just for the purpose of cutting flat bottom grooves I think it is an 8 in.

Phillip from Ky.

View kpo101's profile


32 posts in 2623 days

#4 posted 08-12-2011 05:02 AM

Freud LU83R or LU84M are the two blades in the Freud family that cuts a flat bottom. Take a look at this site picture and it will show you the flat cutting tooth and the other raker teeth (right and left).

-- When the problem becomes just too much, There is always the directions!! Karl O. of Louisiana

View gfadvm's profile


14940 posts in 2685 days

#5 posted 08-12-2011 05:11 AM

I use my Freud box joint blades to cut splines in mitered joints. They are not only flat top blades but cut very cleanly. Use a very thin backer board for no tear out and very clean cuts. I bought my box joint blades at HD for $95.

-- " I'll try to be nicer, if you'll try to be smarter" gfadvm

View WinterSun's profile


163 posts in 2604 days

#6 posted 08-12-2011 09:58 AM

kpo101—ATBR blades like that don’t actually cut a totally flat bottom. They leave a profile somewhat akin to this: |\_/| (not unlike a stack dado) because the raker doesn’t cut quite as deep as the other teeth. It’s better than a straight ATB blade for cutting slots for keys/splines, but it can’t match a true FTG blade. I use a Freud LM72 for that purpose.

-- Rory // Milwaukee, WI

View Fred Hargis's profile

Fred Hargis

4981 posts in 2488 days

#7 posted 08-12-2011 01:05 PM

Forrest will grind a WW II to that spec, I can’t remember the exact nomenclature they use for it but if you talk to them on the phone they can tell you. What has kept me from getting one is the cost, I seem to remember it was in the $130 range (10”). For splines on mitered corners I’ve been using a Freud rip blade.

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

View knotscott's profile


8008 posts in 3370 days

#8 posted 08-12-2011 05:19 PM

A flat top grind (FTG) is the only grind that will give a truly flat bottom. WinterSun and Rick3DDD are correct that ATB/R and TCG blades do not leave truly flat bottoms even though they have a flat raker tooth….the other teeth protrude above the raker and leaves a small groove either at the edges or in the middle.

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

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