comparators – Download as PDF File .pdf), Text File .txt) or view Calibration Comparators • Brookes Level Comparators • Eden-Rolt Millionth Comparators. Uses of Eden-Rolt comparator is specified in this section. Example for Mechanical comparators are Dial gauge, Read comparator, Johansson Mikrokator, Sigma comparator, Eden – Rolt millionth comparator etc.
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Published by Lynette Morris Modified over 3 years ago. A beam of light milliontj through a graticule suitably engraved with a linear scale and the movement of mirror causes this scale to move up or down past a translucent screen inside the observing hood of the instrument. Introduction international meter 2.
Mechanical Optical Comparators (Metrology)
The point of importance in optical comparator is that mirror used must be of front reflection type and not of normal back reflection type.
Any wear, play, backlash or dimensional faults in the mechanical devices mullionth will also be magnified. Why are school administrators overpaid compared to teachers? The whole system could be explained diagrammatically by Fig.
COMPARATORS Introduction:
The comparatpr image of index line on the graticule can be adjusted by means of screw in order to set the zero. Two brackets are mounted on a transverse bar carried through the base.
The mirror is mounted on a knife-edge and it can be tilted about the fulcrum by any linear vertical movement of the contact plunger. The green light then passes to a condenser which via an index mark projects it on to a movable mirror Comparatorr, whence it is reflected to another fixed mirror M2, and then back again to the first moveable mirror.
The image of the scale and the index line could also be viewed through a projection system.
Mechanical Optical Comparators (Metrology)
The amplified mechanical movement is further amplified by a simple optical system involving the projection of an image. Why do other students get annoyed if one students asks too many questions to the teacher?
Electrical and Electronic Comparators Metrology Previous post: In the focal plane of the eye-piece, a fine reference line Index is provided and the system of lenses is so arranged that the image of the scale is projected in the same focal plane.
Usually the mechanical comparators have linear scale. Feedback Privacy Policy Feedback. A combination of magnifying principles has lead to the development of a few more types of comparators, which are: In mechanical comparators, the required magnification is obtained by using mechanical linkages, levers, gearing and other mechanical devices.
The transverse bar is spiral grooved to allow easy and quick lengthwise adjustment of bracket. Principle of Optical Comparator. Dial Indicator Fitted to Pillar stand: Its design is simple and economical.
There are other attachments also on the base for various works. Electrical and Electronic Comparators Metrology. Optical magnification provides high degree of measuring precision Mp to reduction of moving members and better wear resistance qualities. Further these possess better wear resistance qualities as the only wearing members are the plunger and its guide and the mirror pivot bearing.
The division of the scale image opposite the index line indicates the amount of movement of contact plunger. When correctly adjusted, the image of the index line is seen against that of the graticule scale. They are usually robust and millionhh to handle.
It is very difficult to incorporate an arrangement for adjusting the magnification. Becoming a high school teacher in California?
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