Testing Instruments plays Important Role in Engineering

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Micrometers are devices that can make extremely accurate measurements. The name comes from two Greek words that mean "small" and "measure." These devices have been used since the 17th century by scientists, engineers, and machinists to make precise measurements of distance, depth, angle, diameter, and thickness of a various substances. There are basically three types of micrometers: mechanical micrometers, electrical micrometers and laser micrometers.

Mechanical Micrometers:

The mechanical micrometer is the oldest, most common and least expensive type of micrometer. It consists of a finely threaded rod that fits into a tube that is connected to a C-shaped structure. There are markings along the sleeve that fits over the turning rod to measure the distance from the end of the rod to the end of the C-shaped structure. To measure the thickness of an object, place the object against the end of the C-shaped structure and turn the screw until it touches the object. The thickness of the object can be read off the markings on the micrometer.

Digital Micrometers:

Electrical micrometers are called "digital micrometers." They look like a mechanical micrometer except they have a thick handle that holds the electronics and battery. On the handle, there is a digital readout similar the readout on a digital clock. There are usually buttons for such functions as changing between inches and micrometers and setting the zero readout. Digital multimeters are used exactly like mechanical micrometers except that the measurements are read from the digital display. Digital micrometers are more accurate than mechanical micrometers--usually giving one or two more decimal places of precision. More expensive models may feature two turning knobs: one knob for coarse adjustments and another knob that advances the rod a small distance for each turn.

Laser Micrometers:

Laser micrometers have several advantages over older-style micrometers. Laser micrometers are much more accurate than any other style of micrometer. They usually display one or two more decimal places of precision than any other style of micrometer and even more for some very expensive instruments intended for scientific research. Another advantage of laser micrometers is that they are no longer restricted by the C-shaped structure common to other micrometers. A laser micrometer can easily measure distances of several miles and still maintain an accuracy of hundredths of an inch. Laser micrometers can also easily be configured to measure such things as depth and hole diameter that are difficult to measure using older-style micrometers.

Vernier calipers use two parallel scales, a main and a vernier. The scales are in inches or metric. Divisions on the vernier scale are one more than the main scale, gaining one more digit in accuracy. The main scale is fixed and the vernier one moves. Using both the main scale and the vernier provides measurements either in inches and tenths of an inch or millimeters and tenths of a millimeter.

Benefits:

Measuring tolerances in scientific settings often require more precision than simple rulers can give. Manufacturing specifications for small parts may be smaller than a millimeter. For even smaller measurements, Vernier micrometers can measure ten-thousandths of an inch.

Height gauge includes a support erected on a base, a slider movable on the support, a main graduated scale with no numerical values vertically movable in the moving direction of the slider, and a numerical value belt movable on one side of this main graduated scale with no numerical values. The movement of this numerical value belt makes it possible to zero-set the slider at a desired position on the support.

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