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Forum topic by MrRon posted 03-12-2016 05:43 PM 534 views 0 times favorited 9 replies Add to Favorites Watch
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MrRon

3926 posts in 2704 days


03-12-2016 05:43 PM

Topic tags/keywords: question blade

As you know, RAS’s should use a blade with a negative tooth rake in order to counter the “self feed” characteristic. If using a dado in a RAS, would it tend to self feed more aggressively than a single blade? I am not aware of dado sets available with a negative rake.


9 replies so far

View Fred Hargis's profile

Fred Hargis

3930 posts in 1954 days


#1 posted 03-12-2016 06:00 PM

Ron, actually I think the Freud sets have a -12ยบ hook, and I have a CMT set that also has a negative hook (not sure how much). Others probably do as well. Still, the self feed can be worse with a dado set, just due (I guess) to the width of the cut. So far I’ve limited myself to 5/8” max just for that reason. But even though it’s worse, it’s not anything that can’t be managed….just take a little more care.

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

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MrRon

3926 posts in 2704 days


#2 posted 03-12-2016 06:13 PM

Thanks Fred; I have to make some dado cuts for 3/4” shelves for a tall book shelf and a RAS is perfect for the job.

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knotscott

7209 posts in 2837 days


#3 posted 03-12-2016 07:16 PM

The thicker the blade, the stronger the tendency to self feed would be. There’s a mix of hook angles on dado sets. Only some have a positive hook. A lot of the better brands have dados sets that are slightly negative or very close. Infinity, Freud, DeWalt/Delta, CMT, Marples, Forrest, Amana to name a few.


Sets like the Systimatic, Oshlun, Avenger, HF, Grizzly, Oldham, MLCS, Mibro, Avanti and others have a positive hook:

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

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MrRon

3926 posts in 2704 days


#4 posted 03-14-2016 04:13 PM

OK Knotscott! If I get a dado set with a negative rake, can I also use it effectively on my table saw? I suspect the dado would tend to “lift” the wood, so I would need to apply enough downward pressure to keep it flat on the table. Is that right? Thanks for your reply.

I have several dados, one of which is a HF. Surprisingly the HF dado cuts real well despite it’s price and questionable quality. Obviously you would want a dado that can be used on both a table saw and a RAS. Can you recommend a dado that would be a good compromise? The other dados I have are (2) “wobble” types and a Freud box joint blade.

View toolie's profile

toolie

2022 posts in 2089 days


#5 posted 03-14-2016 04:24 PM

IMHO, you should dump the wobble blade. I use an 8” Freud dado blade and I’ve used it on both a RAS and a TS. IMHO, taking shallower passes when using a RAS reduces the tendency to self feed or stall the blade.

-- there's a solution to every problem.......you just have to be willing to find it.

View Fred Hargis's profile

Fred Hargis

3930 posts in 1954 days


#6 posted 03-14-2016 04:37 PM

Not Scott (really) but I’ve been using the Freud set I mentioned earlier on my table saw for more years than I can remember….so, YES, they work fine on the table saw. It goes back and forth between the TS and the RAS.

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

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patron

13535 posts in 2802 days


#7 posted 03-14-2016 04:39 PM

use my dado blades on the RAS all the time
but do use this add-on platform for it
so as not to cut the back fence up

just feed slow as the grab can jamb the blades
if not controlled right

http://lumberjocks.com/patron/blog/11083

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

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knotscott

7209 posts in 2837 days


#8 posted 03-14-2016 04:47 PM


OK Knotscott! If I get a dado set with a negative rake, can I also use it effectively on my table saw?

- MrRon

Yep. Shouldn’t be a problem. The cutting force isn’t really downward with a dado set on a TS anyway. It’s always a good idea to to use push pads or push shoes, etc., to give you good control over the work piece. I’ve owned 3 dado sets that had low to negative hook angle, and only one with a steep hook. Never an issue.

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

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MrRon

3926 posts in 2704 days


#9 posted 03-15-2016 03:37 PM

Thanks for all the replies. I put my HF dado set on the RAS and cut the dados. They went perfectly. There was a bit of “self feed”, but it could be controlled easily. Only one time did the dado grab and then it stalled. Reason was the plywood was not flat to the table. I was trying to apply downward pressure on the work, but I let up on the pressure a bit and then it grabbed. This is the first time I used a dado on a RAS and overall, I am happy with the results.

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