Abstract
Technical possibilities to create equipment for the calibration of flat angles are discussed in the article. The angular standard measure, the radian, has not been realised as a standard unit until now. Nevertheless, the unit of angular measure in degrees is used as the geometric measure of length in geodesy, machine engineering and other branches of industry – by multiangular prisms – polygons with an autocollimator, rotary tables, circular scales, etc. It should be noted that these angle measures are calibrated against the upper level measures (etalons) only at the several intervals depending on the number of sides (angles) of the polygon or the other standard measure. The methods of calibration of constant angle value in full circle are used as well. At the same time geodetic instruments, rotary tables of metal cutting tools and instruments, rotary encoders have a great number of discrete values. These values between the calibrated points remain unknown during calibration. The information received during calibration relative to all the information available can be evaluated using information entropy. The equipment of calibration permitting to select significantly more information would be essential for better accuracy assurance of instruments used in machine engineering, geodesy, building structures. Theoretical and technical background for justifying and developing such equipment for angular accuracy calibration is presented here. A modern scientific and technical background validates this concept.
Highlights
The angle measuring instruments produced by many Western companies were used in Lithuanian factories and institutions for a long time
The production of circular scales is straightforward linked with the methods and means of angle measurements
To illustrate the solution in a more straightforward fashion we present a relatively small matrix with 16 unknowns – angle error values from measurement results to be found
Summary
The angle measuring instruments produced by many Western companies were used in Lithuanian factories and institutions for a long time. Circular scales were produced using mostly circular dividing machines produced by VEB Feinmess Dresden company. Original circular dividing machines were constructed and put into practice at the Experimental Scientific Research Institute of metalcutting tools (ENIMS) Vilnius branch. The production of circular scales is straightforward linked with the methods and means of angle measurements. These methods have not altered much in time being in their general approach. It is valid for circular scales measurement. High accuracy and discretion of circular scales measurement remain an acute problem even nowadays
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