Engineering College

A belt sander has a belt speed of 1500 ft/min. The coefficient of friction between the sander and the plywood being finished is 0.2. If the downward (normal) force on the sander is 15 bf, determine (a) the power transmitted by the belt, in Btu/s and hp, and (b) the work done in one minute of sanding, in Btu.

Answers

Answer 1

The power transmitted by the belt in a belt sander can be calculated using the formula P = F * V, where P is power, F is the force, and V is the velocity. Therefore, by applying the given values and calculations, we can determine the power transmitted by the belt in Btu/s and hp, as well as the work done in one minute of sanding in Btu.

In this case, the downward force on the sander is given as 15 bf (pound-force) and the belt speed is 1500 ft/min. The coefficient of friction between the sander and the plywood is 0.2. To calculate the power transmitted by the belt, we use the formula P = F * V, where P is power, F is the force, and V is the velocity. Substituting the given values, we have P = 15 bf * 1500 ft/min.

To convert the power from British thermal units per second (Btu/s) to horsepower (hp), we need to use the conversion factor of 1 hp = 2544 Btu/s. So, we divide the power in Btu/s by 2544 to get the power in horsepower.

To determine the work done in one minute of sanding, we multiply the power by the time. Since the time given is in minutes and the power is in Btu/s, we need to convert the time to seconds before performing the calculation. Finally, the work done can be expressed in Btu.

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Related Questions

Unistrut​®

can be used to secure the conduit when making offsets in order to prevent crooked bends

Answers

Unistrut® can be used to secure conduit when making offsets, helping to maintain straight and accurate bends and preventing crooked bends.

Unistrut® is a brand of metal framing system commonly used in construction and electrical installations. When making offsets in conduit, which refers to creating angular bends or changes in direction, it is important to ensure the bends are accurate and straight. Using Unistrut® as a support system can help secure the conduit during the bending process, preventing it from shifting or becoming crooked. By providing stability and a secure mounting point, Unistrut® helps maintain the desired alignment and prevents unintended deviations or irregular bends. This ensures that the conduit remains properly aligned and facilitates the installation of electrical wiring or other materials through the conduit.

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