Standards of Measurements – End Standards
Posted by mechlook info on January 11th, 2012 07:18 PM | 4 Comments
End Standards
For all practical measurements in workshop, we employ end standards e.g. slip gauges, gap gauges, end of micrometer anvils etc. Thus the importance of end standards (which are actually used in general measurement applications) arose. Length bus and slip ...
Standards of Measurements – Line Standard
Posted by mechlook info on January 11th, 2012 07:18 PM | No Comment
Line Standard
According to it, yard or metre is defined as the distance between scribed lines on a bar of metal under certain conditions of temperature and support. These are legal standards and Act of Parliament authorises their use.
Yard. The Imperial ...
Standards of Measurements – Sub-division of Standards
Posted by mechlook info on January 11th, 2012 07:18 PM | No Comment
Sub-division of Standards
The Imperial standard yard and metre defined previously are just like master standards and can't be used for ordinary purposes. Thus depending upon the importance of standard, standards are subdivided into four grades.
(i) Primary Standards. In order that ...
Standards of Measurements – Standards
Posted by mechlook info on January 11th, 2012 07:17 PM | No Comment
Standards
The two standard' systems for linear measurement used throughout the world are English and Metric (yard and metre). Realising the importance and advantages of metric system, most of the countries are adopting metre as the fundamental unit of linear measurement.
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Standards of Measurements- Introduction
Posted by mechlook info on January 11th, 2012 07:17 PM | No Comment
Introduction
Metrology concerns itself with the science of measurements and nearly all measurements in workshop involve measurement of dimensions. Production engineer is specially concerned with the measurement of the length and angle. Length is of fundamental importance as even angles can ...
Standards of Measurements – Elastic Deformation In the Gauging of Standards
Posted by mechlook info on January 10th, 2012 06:55 PM | No Comment
Elastic Deformation In the Gauging of Standards
It has been observed that surface plates, large masters etc. compress, bend and twist from gravity or from other applied forces. Where very high accuracies of measurement are involved, elastic deformation (bending, squashing, compression ...
Standards of Measurements – Conditions of Comparison
Posted by mechlook info on January 10th, 2012 06:55 PM | No Comment
Conditions of Comparison
Determination of length and calibration must be made under specified conditions which need to be strictly maintained for accurate results.
The various factors to be rigidly maintained and which directly affect the accuracy of determination are :
(i) Environment. The ...