What is a Dado Blade and What is it Used For?

​A dado blade ​is a circular blade that’s designed to work on table saws or radial arm saws in order to cut grooves into wood and help connect pieces together.

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There are two types of dado blades available: stacked dado blades and wobble dado blades. As you can probably tell from their names, both look somewhat different from one another.

Stacked dado blades are comprised of two outer cutters that look like a typical table saw blade, and on the inside, there lies several removable chipper blades, often of varying widths. You can add or remove one or a combination of those chipper blades to get your desired cutting width.

Wobble dado blades are a lot simpler than their stacked counterparts because they only utilize a single blade to create the grooves that you desire. They utilize an offset rotation that helps them get an almost similar result to a stacked dado blade, but they’re not really as good.

​​​​​​​A high quality cabinet table saw is probably the best option to make dado cuts with, but as long as you understand how to use the dado blade on your saw, you’ll be able to make the following cuts:

Dado Joint – This is basically a slot/trench cut into a piece of wood that appears to have three sides if you view it in cross-section. Dado joints can be cut either perpendicular or across the grain.
Finger Joint – This woodworking joint is achieved by cutting a bunch of interrelated cuts in two pieces of wood in a rectangular fashion. The end result looks like the shape of the human hand when the fingers are interlocked perpendicularly.
Rabbet Joint – This is a groove that’s cut into machine-able materials such as wood. It looks like it’s open to the edge of the surface it’s cut into when viewed in cross-section.
Tenon Joint – This joint is often formed on the end of rails and can be inserted into holes that are rectangular- or square-shaped (called a mortise) found in the corresponding member. Basically, an ably tenet joint should fit perfectly into a mortise hole.

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