In optical comparators, the minor is tilted by the measuring plunger movement and the movement of reflected light is recorded as an image on a screen. A compression spring limits the measuring pressure. Vertical projectors: The main axis is parallel to the plane of the screen.

The optical comparators are used for getting accurate measurements. This combination of slip gauges then replaced by the work piece and difference in dimensions is noted from the movement of a pointer on graduated scale. It consists of a threaded vertical column, mounted on the base to hold the measuring head. [2] Hartness' long-continuing work as the Chairman of the U.S.'s National Screw-Thread Commission led him to apply his familiarity with optics (from his avocations of astronomy and telescope-building) to the problem of screw thread inspection. The typical method for lighting is by diascopic illumination, which is lighting from behind. Work table is used to place and hold the measured piece.

A high order of magnification is possible because no physical contact is made to the part being checked.

Report a Violation, Comparators: Need, Elements and Qualities |Metrology, Standards of Length Measurement | Metrology. The first application was the checking of the bores of motor-car cylinder blocks. If the gap ‘h’ is large, pressure recorded would be small. Type # 5. Means a plunger movement of 0.002 mm can be magnify up to deflection of pointer of 2mm. In mechanical optical comparators small displacements of the measuring plunger are amplified starting by a system consisting of pivoted levers.

This small quantity of deflected fluid will cause to raise fluid in capillary tube.
Pneumatic Comparators 5. For the simplest profile projector, the product's inverted image, also known as mirror image, will be displayed on the screen. These provide hold and support to all the other units. In subsequent decades optical comparators have been made by many companies and have been applied to the inspection of many kinds of parts. Jet of air helps in cleaning the dust, if any, from the component being measured. Read also: Mechanical Comp…

These plunger movements are magnified, by lever and deflect the pointer on a graduated scale. An edge of the specimen to examine may be lined up with the grid on the screen. This projection screen displays the profile of the specimen and is magnified for better ease of calculating linear measurements. harvnb error: no target: CITEREFRoe1937 (, "United States Patent 1703933: Optical comparator", "Shedding light on optical comparators—How much better can this type of system get? Copyright 10. Different part of measured piece often request different magnification. Magnification of fluid displacement comparators is approximately given by: Instruments, Measurement, Metrology, Comparators, Types of Comparators. (iii) To check the alignment of lathe machine centers by using a bar between centers. Select appropriate data processing mode: all optical measuring projectors on market, without exception, have been digitized. The principle of working of a Pneumatic comparator is shown in figure 1.16.

Since mechanical comparators actuated by gears, levers, rack and pinion etc. Dial is graduated into 100 divisions. Fig. This increases the error in the measurement. Measuring head carries a vertical spindle which is mounted on two flat steel springs.

See the following diagram of a Mechanical -Optical Comparator The Plunger is replaced with the lever mechanism. Magnification in case of optical comparators is obtained with the help of light beams which has an advantage of being straight and weightless. The projector magnifies the profile of the specimen, and displays this on the built-in projection screen. A comparator is a precision instrument used to compare the Dimensions of a given workpiece component with the actual working standard. On the other hand if the gap ‘h’ is small, pressure would be higher. It consists of a cast iron base, for mounting all the parts of comparator along with the work component to be measure. This will cause to change in intermediate pressure, and will change in the manometer reading. Also this incorporates very less number of moving parts thus less friction and less inertia will leads to high accuracy.

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