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What are Dadoes and Rabbets?
And what is a rabbet? Dadoes, grooves and rabbets are the workhorses of cabinet and bookcase construction. They’re used in woodworking projects to make stronger joints. Dadoes and grooves are flat-bottomed recesses that strengthen supporting shelves and connecting panels.
How deep should a dado be on 3/4 plywood?
1/4″
I was discussing cabinet construction with a fellow woodworker and he said that the depth of a dado in 3/4 plywood should only be a 1/4″.
What makes the dado joint so strong?
They consist of a three-sided channel in one workpiece that runs across the grain of the wood into which another workpiece fits. They offer incredible sheer resistance because this workpiece is captured on three sides.
Why is a dado joint so strong?
The dado joint is one of the strongest woodworking joints you can make. A dado joint is made from a three-sided channel cut across the grain of one work piece. A second, mating work piece fits into the slot. Dado joints are often used to build cabinets and bookshelves.
How deep should a dado be in 1/2 inch plywood?
The dado depth should be no more than one-half the thickness of the stock being dadoed, and its depth should ideally be one-third the stock thickness. For example, in ¾” stock the dado should ideally be ¼” deep and no deeper than ⅜”.
What is the difference between a dado and a rabbet cut?
Rabbet – a notch cut with or across the grain on the edge of a board with the two sides 90º to each other. Dado – a square or rectangular slot that runs across the grain.
What’s the best depth for a dado screw?
If I dado, it’s 1/8″ deep. 1/4″ is a good depth for a lot of dados. You have to weight what you gain in dado shoulder strength against what you lose in strength in the thickness of the dadoed panel or part. On dados that are primarily for alignment purposes, I often go as shallow as 1/8″ deep.
What’s the difference between dado depth and glue surface?
The depth of a dado adds a little extra glue surface the deeper you go, but not that much. It is mostly a mechanical device that captures the part. If the part that goes into the dado is two sided melamine, there is nothing to be gained in glue surface area by using deeper dados. By the way, 3/8″ deep in 3/4″ material is fine.
Is it OK to cut dados 3 / 4 deep?
But the case against making your dados 3/4 deep is that you begin to weaken the sidewall of the carcase if you go too far with it. All that said, I normally just go 1/4″ deep with most cabinetry dados, and I’ve never had one fail.
Why do you need a half deep dado cut?
Part of the case for a half-deep dado is that it provides extra gluing area. There is no face-to-face gluing area in a dado joint so the extra gluing area is not of any use. If it were why not make the dado three-quarters deep?