What is the cutting speed in surface feet per minute (S. F.M.) of a 20 in band saw if the wheels turn at 800 rpm? Round your answer to the nearest 10 ft. Convert your rounded answer to meters per minute (mpm). Round this answer to the nearest 10 meters. Use the space provided for your calculations.

Explanation:

Cutting speed is the speed at the outside edge of the part as it is rotating. This is also known as surface speed. Surface speed, surface footage, and surface area are all directly related. Two wheels can illustrate this. Take two wheels, one wheel which is three feet in diameter, and the other wheel which is one foot in diameter, roll each wheel one complete turn (Figure 1).

The larger wheel traveled farther because it has a larger circumference and has more surface area. Cutting speeds work on the same principle. If two round pieces of different sizes are turning at the same revolutions per minute (RPM), the larger piece has a greater surface speed. Surface speed is measured in surface feet per minute (SFPM). All cutting speeds work on the surface footage principle. Again, cutting speeds depend primarily on the kind of material you are cutting and the kind of cutting tool you are using. The hardness of the work material has a great deal to do with the recommended cutting speed. The harder the work material, the slower the cutting speed. The softer the work material, the faster the recommended cutting speed (Figure 2).

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