In ordering a new cutterhead, the manufacturer should supply the designer with as complete information as possible, including cutting circle diameter, desired surface quality, horsepower requirements of the machine, the type of material to be cut, and other physical specifications of the machine. Problems inherent in standardizing spindles and cutting circles, and how cutterhead design is affected by other machining factors, are also discussed. The safety factor must not be overlooked in designing a cutterhead. Round cutterheads are nearly always used to machine flat surfaces. These cutterheads are designed from a 3-inch-diameter cutting circle, having four high-speed-steel thin knives, to a cutting circle as high as 10 inches having as many as 16 knives. A basic advancement in the design of cutterheads was the cutterhead using milled-to-pattern bits. The operator needs only to sharpen the face of the bits to continue the accurate pattern. The square cutterhead is practical for small short-run patterns but has proven itself impractical from the standpoint of versatility and safety.
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