How do you use a Dekkor angle?
Initially, the angle dekkor is set for the nominal angle of cone by using angle gauge or sine bar. The cone is then placed in position with its base resting on the surface plate. A slip gauge or reflector is attached on the cone since no reflection can be obtained from the curved surface.
What is angle Dekkor explain with diagram?
Explanation: An Angle Dekkor is a small variation of the autocollimator. This instrument is essentially used as a comparator and measures the change in angular position of the reflector in two planes. Working and application: It has an illuminated scale, which receives light directed through a prism.
How does angle Dekkor differ from an autocollimator?
Angle dekkor is not a precision measuring instrument compared to an auto collimator but serves as a simple general purpose instrument in the shop. It has the advantage of giving readings directly without the use of a vernier.
How do Autocollimators work?
An autocollimator works by projecting an image onto a target mirror and measuring the deflection of the returned image against a scale, either visually or by means of an electronic detector.
Which of the following is not true for angle Dekkor?
With a goniometer which is fitted with two 32400 lines radial gratings, it is possible to obtain angle measurements to an accuracy of 0.1 second of arc. 12. Which of the following is not true for angle dekkor? Explanation: It is a type of collimator and contains a small illuminated scale.
Which type of instrument is used to measure the change in angular position of the reflector in two planes illustrate its construction and operating principle?
Auto-collimator is an optical instrument used for the measurement of small angular differences, changes or deflection, plane surface inspection etc.
What is angle gauge in metrology?
Angles gauges, like slip gauges are blocks of hardened steel approximately 75mm long and 16mm wide. They differ from slip gauges in the sense that their wringing surfaces are not parallel to each other, but are at an angle, engraved on them. For measuring angles, angle gauges are more accurate than the sine bar.
What is the principle of sine bar?
The principle of operations of the sine bar is based on the law of trigonometry. If one roller of the sine bar is placed on the surface plate and the other roller is placed at the height of the slip gauge, the structure formed by the sine bar, surface plate, and slip gauge forms a triangle.