same direction—toward the outside of the stack. This way the teeth scorc the wood fibers along the edges of the groove to help prevent tearout. Most manufacturers mark their outer blades with a "This Side Out" label so it's easy to mount them correctly. While the best performing dadoes in our tests have tooth bevel angles of 15° to 25°, ultimately the bevel angles didn't seem to affcct the quality of cut as much as some other factors.
Manufacturers place a flat top "raker" tooth between one or more beveled teeth to clean out and flatten the bottom of the groove. The clcancst cutting dado heads in our test have a "one bevel—one raker" tooth sequence. Other brands varied the sequence from two bevels—one raker, to 12 bevels— one raker. (See chart, page 58-59.)
The hook angle—the cutting angle of each tooth relative to the radius of the blade—is another consideration for blade manufacturers. (See photos, page 59.) Blades with a positive hook angle of 10° or more will demand less feed pressure than blades with low and negative hook angles (0° to -10°). The advantage of a low hook angle is that it's less likely to tearout splinters or chips at the edges of the cut. This capability is especially important when cutting difficult materials such as veneer plywood and melamine-coatcd particle-board (MCP). Low hook dado sets are less likely to climb-cut, or jerk towards you, when used in a radial arm saw.
While a dado's two outer blades make the shoulder cuts, the chippcrs hog out most of the wood and flatten the bottom of the cut with flat-top raker teeth.
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