Rotary Tables-Angular measurement and circular division
Posted by mechlook info on December 14th, 2011 07:53 PM | No Comment
The rotary table is the best-known and most widely used circle dividing instrument. These fall under three categories :
(i) Optical type, employing a precision circular scale read by microscope as its angle measuring element. (Refer Fig. 8.48)
(ii)Mechanical, cam compensated (Refer ...
Angular Measurement and Circular Division-Introduction
Posted by mechlook info on December 10th, 2011 02:25 AM | No Comment
Measurement of any angle precisely is one of the most important human activities. It is only because of precise angular measurement that ships and aeroplanes can navigate confidently without the help of the sight of the land. The relation of ...
Caliper Principle (For circular division and calibration of polygons)
Posted by mechlook info on December 7th, 2011 07:02 PM | No Comment
The main advantage of angular measurement and circular dividing is that no arbitrary standard of angle is required but all angles can be obtained by uniform division of the circle. There may be some angles which are themselves not an ...
Optical Instruments for Angular Measurement
Posted by mechlook info on December 5th, 2011 12:50 AM | No Comment
Autocollimator. This is an optical instrument used for the measurement of small angular differences. For small angular measurements, autocollimator provides a very sensitive and accurate approach. Auto-collimator is essentially an infinity telescope and a collimator combined into one instrument. The ...
Angular measurement and circular division-Angle guages
Posted by mechlook info on November 14th, 2011 10:05 AM | No Comment
The first set of combination of angle gauges was devised by Dr. Tomlinson of N P.L. With thirteen separate gauges used in conjunction with one square block and one parallel straight-edge, it is possible to set up any angle to ...
Angular measurement and Circular division-Angle Gauge Dividing Head
Posted by mechlook info on November 14th, 2011 09:42 AM | No Comment
With the introduction of angle gauges, a new form of dividing head for exact rotation through any angle was devised by Dr. Tomlinson. It consists of a cast body having a central hole through which a large diameter spindle is ...
Angular measurement and circular division-Vernier and Optical Bevel Protractor
Posted by mechlook info on November 14th, 2011 09:40 AM | No Comment
It is probably the simplest instrument for measuring the angle between two faces of component. It consists of a base plate attached to the main body, and an adjustable blade which is attached to a circular plate containing vernier scale. ...