These instruments are based on the theory of Wheatstone A. When the bridge is electrically balanced, no current will flow through the galvanometer connected to the bridge, and the pointer will not deflect. Any upset in the inductances of the arms will produce unbalance and cause deflection of the pointer. Linear Variable Differential Transformer LVDT is the most popular electro-mechanical device used to convert mechanical displacement into an electrical signal.
It is used to measure displacement. Comparison between gauges and comparators are as follows,. Gauges Comparator 1. Gauge is device designed to compare the manufactured component against the given drawing.
Comparator is device designed to compare knownknown, known — unknown, unknown- unknown parameters. The gauge can only verify the manufactured component is accepted or rejected. Comparator gives the readings of measurement of the manufactured component.
Low in cost More in cost 4. Easy to use on the shop floor Needs pneumatic or other sources to use on shop floor 5. Limited range of application Large range of application 6.
Comparison between measuring instrument and comparators are as follows,. Mechanical Instrument Comparator 1. It is not give any magnification. It gives magnification. Skilled operators are required. Semi-skilled operators are required. Observational error is occur.
Parallax error is occur. Maintenance is less. Maintenance is more. The remote controlling is not possible. It may be operate by remote. A Uniform response is not obtained. Uniform response is obtained. Used for checking and measurement. Used for comparsion. Less sensitive. More sensitive. Vernier caliper Example: Sigma comparator, Dial Indicator. Comparators are used for Following purposes :.
Currently, he is working in the sheet metal industry as a designer. Additionally, he has interested in Product Design, Animation, and Project design.
He also likes to write articles related to the mechanical engineering field and tries to motivate other mechanical engineering students by his innovative project ideas, design, models and videos. Maintenance is often performed onsite by a technician as the tool is generally to large to send and receive regularly.
In addition, regular calibration is required to confirm that the accuracy is as specified. As with maintenance, calibration is generally performed locally. Place the object on the stage. A scale is applied to the image projected enlarged on the screen to measure the dimensions. Alternatively, you can use the XY stage together and measure the dimensions from the amount of movement.
An optical comparator with a computerized calculation function, you can obtain various measurement results such as width, diameter, and angle by taking measurement points while moving the stage. Place the object to be measured on the screen and adjust the height of the table to focus.
Next, align the orientation of the side you want to measure on the projected image with the orientation of the screen reference line, and adjust the value of the XY stage to 0. Next, move the stage using the stage movement handle and align the other side of the projected image to be measured with the screen reference line. At this time, the movement amount of the stage is displayed in each of the X and Y directions, so this value becomes the measured value.
In the case of simple measurement in only one direction, the amount of movement in only the X or Y direction is used. Next, align the center point of the circle on the projected image with the point where the screen reference line is public. In the case of radius, take 0 points here and move the stage to check the movement amount at the point where the edge of the circle was at the center of the stage.
In case of diameter, move the stage once from here to the edge of the circle, take 0 point, and move to the opposite edge to check the amount of movement. In either case, it is common to measure in four directions in a cross shape. It is also possible to measure by applying a concentrically graduated sheet called a "chart" to the screen. In the case of an optical comparator with a calculation function, the diameter and radius are automatically calculated by taking three measurement points at the edge of the circle.
There are several ways to measure the angle. There is a method of checking by putting a sheet called "chart" with fine scale like a protractor on the screen. On an optical comparator with a calculation function, the angle is calculated by specifying two straight lines. There are several types of charts. For measuring the diameter and radius, there are concentric circle marks, for measuring angles, there are radial marks, and for both.
Still, wondered how it will work then. Now you get an idea about what are the different types of Comparators right? You can follow the links to get the individual articles for the individual comparator types. If you have any doubts, please let us know in the comment section below.
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