Two dado blade types dominate the industry. Wobble dado blades are simple one-piece blades where you adjust the width by making it wobble more or less — unfortunately this leaves the bottom of the dado slightly concave. Stacked dado blades include blades, chippers, and shims which you add or subtract to get the correct width. These type leave a flatter bottom, but are usually more expensive and can be difficult to adjust.
Freud tries to combine the advantages of both types of dado blades with its Dial-A-Width sets. The sets are in essence a stacked dado blade without the shims. Instead Freud uses a patented dial hub that adjusts the blade width by .004″ with every click.
The dado set can cut dadoes or grooves up to 29/32″ wide in plywood, veneered plywoods, hardwoods, and softwoods. The blades work with a 5/8″ arbor on either left- or right-operating saws. Freud makes both a 6″, 20-tooth blade set and an 8″, 24-tooth blade featuring their own micro-grain TiCo (Titanium and Cobalt) high-density carbide teeth.
Either set includes two blades, five chippers (four 1/8″ wide and one 3/32″ wide), a wrench, storage case, and DVD. You’ll pay $230 for the 6″ set which would be adequate for most woodworkers unless you need to cut dadoes deeper than 3/4″ or so, and $270 for the 8″ set. Do your research before buying one of these sets — there are some reports that they don’t work on all table saws.