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You may want to find a metric bit that fits. If I read your original post right you have the special nominal size plywood dado bits. Though I would encourage you to try the other solution below.
The fastest solution to your problem is to trust the Kreg. I got to the point where I only use the Kreg pocket screws on the top and bottom shelves then set the middle shelf with the Kreg. All the rest of the shelves (if I have them) I make adjustable with 5mm shelf pins. I just completed an 8' tall bookcase that way. Yes I know 8' is a dumb idea, and I won't do it again, but the shop is 9' 6" tall so it worked OK. I set the middle shelf with pocket screws to brace and control bowing or belly in the sides. I do glue every joint, with Titebond. I set the back in 3/8" ply, glued perimeter and 1" staples all around. It is holding an incredible amount of weight. I have maybe 8 wall hung bookcases, 4' x 4' with top, bottom, and middle shelf. I am using a face frame, and Kreg pocket screws. Each shelf is holding solid books and magazines. Not so much as a groan under the load.
The short point is this. Use the Kreg, butt joints with glue, and Kreg Pocket screws will hold. The reason most of us use the Kreg is speed. You will be done with the shelves before you could get the dados dialed in correctly, and cut. I do like the use of Titebond, and face frame with a nice solid back. Your shelf will last longer than some high priced furniture.
Phil
Hi Jens Jensen,
I have these bits, but the plywood is less than the 23/32" cut. Like Phillip said, the plywood is probably foreign and in metric thickness. There's about .023 less than the 23/32" plywood which converts to somewhere between 11/16" - 45/64". Therefore allowing the extra slop in the dado cut.
What's surprising is that the sell 23/32" plywood and list it as exactly the thickness it is, which I've purchases many of times and successfully made tight dados. But on the Oak plywood, they list it as 3/4" plywood and it's actually less than the 23/32" material. Go figure! They should list it exact.
Hi Jens Jensen,
I have these bits, but the plywood is less than the 23/32" cut. Like Phillip said, the plywood is probably foreign and in metric thickness. There's about .023 less than the 23/32" plywood which converts to somewhere between 11/16" - 45/64". Therefore allowing the extra slop in the dado cut.
What's surprising is that the sell 23/32" plywood and list it as exactly the thickness it is, which I've purchases many of times and successfully made tight dados. But on the Oak plywood, they list it as 3/4" plywood and it's actually less than the 23/32" material. Go figure! They should list it exact.
Jens:
I am not trying to stir things up. I am confused, and curious if there is something I am missing. I follow the links you give to Sommerfeld Tools and the bits end up in the USA measurement listings. The sizes you sent match the sizes of my Grizzly Dado bits for plywood (USA) sizes. I was understanding that the special bits are due to the nominal size of the American plywood, not being a true full step measurement. All due to shrinkage. At least that is the explaination that both Grizzly and Woodcraft give in their sales materials. My suspicion is that the metric sized plywood does the same thing and that is why John was having trouble.
My first trip to our new Home Depot Store, I bought some "Birch" face ply, in a paint grade. I was cutting the stock down and noticed that I was getting some different sizes (I was stepping off some shelving) and thought it was my bad measuring. A little later I saw a bar code sticker with a Millstead name and 12mm (if I remember correctly) printed on it. I looked at the 1 X 8 that I got at the same time with the same name on it. Metric again. I called the store and asked, the "associate" told me that I might get the exact thing in again and maybe not. Alluding to the idea that sometimes it is one way and sometimes another. He told me that resupply is not consistent and they were correct, I made the face frames from the 1 X 8 South American "pine" that I have never seen again. I have noticed that rabbets to join the plywood are by fit, since neither my Rockler, Woodriver, Frued, or Grizzly bits matches the metric sizes exactly. Which is why I was confused when I followed your link. Is there something I am missing? At my age I do that a lot! I was building a wood box yesterday, and upset that I could not find the right bit, only to realize I had my hand on it. I claim the old age explanation, not the IQ deficit. I also know that there is much I do not know, and I am always interested in knowing more.
Phillip
I was certain you would love it. I got so addicted to the speed, I really found more uses than I ever would have imagined. I have two outbuildings that I put together with regular framing lumber, and the Kreg. Both building withstood the 140 mph hurricane we had 3 years ago. That says something to me.
I use the Kreg and pocket screws and sometimes I do not even bother with the hole plugs. You will find that the more you use it, the less the pocket holes matter. I love finishing a project. If I could get the finish coats to dry as fast as the pocket screw goes in, I would be in heaven!
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