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Carbide Blade Teeth are wider than the body of the blade and typically have no set. Where the teeth on steel blades are ground on the front, carbide teeth are groundQsaw on their tops as well as their fronts and sides. The basic rule is the more teeth the finer the cut, but you also have to consider the thickness of the cut and the cutting feed rate. The fine tooth sawblades do tend to leave a smoother finish, because each tooth takes a smaller bite. However, if the material is too thick (remember, it’s the overall thickness when it’s stacked that’s important), or if it is being fed at a high rate, the gullet capacity of a fine-toothed blade is too small.

Although carbide-tipped blades last up to 10 times longer before re-sharpening is necessary, you will typically pay two to three times as much for them as for their steel counterparts. If you’re cutting tough hardwoods or man-made materials such as particleboard, melamine, MDF (medium density fiberboard) or laminates then you’ll be better off in the long run with carbide-tipped blades.

Article from: http://bandsawblog.com