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Oh No!! Not another Dado/Rabbet question.

6/30/20       
Ken M Member

Sorry folks, I don't do a lot of case work but when I do it's the same old situation. I usually end up with a router and a reverse helix panel bit. Usually takes 2 passes to get a good fit (of course the next sheet probably won't fit). I like the idea of going to a standard dado of 1/2" and rabbeting the fixed shelf end. So do you use a sled or what to cut the rabbet? Obviously a shaper with a sliding table would be ideal but with a sled I have 40" shelf hanging out. How are you supporting them? I also like the idea of having the shoulder to set the depth.

6/30/20       #2: Oh No!! Not another Dado/Rabbet que ...
rich c.

Go to dowel, confirmant screws, or biscuit construction and all that fussing with sheet thickness will end.

6/30/20       #3: Oh No!! Not another Dado/Rabbet que ...
Ken Member

I should add this is furniture grade hardwood plywood so no exposed fasteners. That's why the dado work best for alignment and strength. I know, cnc, but I can't justify it now, maybe in the future.

6/30/20       #4: Oh No!! Not another Dado/Rabbet que ...
Leo G Member

Back in the early days when I got tired of dealing with inconsistent thicknessed plywood I would make a 5/8" dado and use the tablesaw to make the end of the plywood that went into the dado 5/8" and then sand it to get a bit of room so it was a snug fit.

I'm sure there's many ways to make the rabbet so you have 5/8" on the end, that's the way I did it. Quick and easy.

Now I don't bother. I find the thickest pc and dado to that. I've been using pocket screws on the underside of cabinet decks and they snug the plywood right up to the dado shoulder. It's glued so it's pretty strong, plus a face frame glued to the front edge and a back nailed to the back edge makes it pretty stable.

6/30/20       #5: Oh No!! Not another Dado/Rabbet que ...
scott brady

Look at the Lamello Tenso or Davio system.
Handles all types of hidden connections fixed or removeable.

6/30/20       #6: Oh No!! Not another Dado/Rabbet que ...
Pete

Cut your groove on the table saw with a dado set. I usually do a 1/4" wide, 1/4 inch deep. or 3/8 wide/deep. Then to cut the tenon on the plywood, I would run it on the shaper with a power feed with the tenon cut between the cutter head and the table. Any variation in plywood thickness wont matter. I will say that majority of my work is furniture based, don't run much plywood. But even then, Ill just run the tenon off the table saw.

6/30/20       #7: Oh No!! Not another Dado/Rabbet que ...
Karl E Brogger  Member

Website: http://www.sogncabinets.com

My vote would be power feed on a shaper as well for cutting the rabbet. We do all of our shelf edging cutting a rabbet to create a tongue to index the shelf edge. Similar idea.

If you're running the dado referencing from same face, the depth should be pretty darn consistent.


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6/30/20       #8: Oh No!! Not another Dado/Rabbet que ...
Ken m Member

So the Dado part I'll do on the slider. For the tendon I was just going to make a step with a straight cutter so the cutter to table measurement is consistent. If you're doing a true tendon why wouldn't you make it thicker, say 3/8" or 1/2" instead of 1/4"? Seems it would be stronger. Thanks guys so far for the responses.

7/2/20       #9: Oh No!! Not another Dado/Rabbet que ...
Adam

I went back to rabbet/dado construction when we started using prefinished ply. I could never find a glue that would stick to the finish.

I prefer dados for accurately locating fixed shelves and interior panels. We do it like Leo. Set one size on the table saw. 99% of the time you can pull the panel tight to one side if necessary. The majority of sheets in one lift are the same thickness. The key is to never ever mix different lots of sheets.

So we 1/4” rabbet/dado, glue, use one 1/4” cabinet stapler with 1.5” staples. The 1/2” back gets planted on the back and stapled every 3-4”

7/3/20       #10: Oh No!! Not another Dado/Rabbet que ...
Scott

Maybe keep an eye out for an overhead router, they sell for next to nothing, but are amazing machines if you have the room for one,


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