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24 Oct 2017 Linear Measurement Devices. ? Vernier Caliper: It is a visual aid that allows the user to measure more precisely than could be done unaided when reading a uniformly divided straight or circular measurement scale. Least count: The least count of a measuring instrument is the smallest change in the
System fundamental unit of length is METER 1.METER=1000MM 1CENTIMETER=10MM 1MILIMETER=1000MICRON 1MICRON=0.001MM .S.I.SYSTEM As per S.I.. g. Slip Gauges. E. Meter ‡ End Standard. Yard.g. ‡ Wavelength Standard E.Standards of Linear Measurement ‡ According to the instrument design the length
22 Mar 2016 is within the process and measuring instrument capabilities available in the plant. 2. To determine the To determine the measuring instrument capabilities and ensure that these are adequate for their respective . So, the instruments for direct measurement of linear dimensions fall into two categories. 1.
26. Linear Gages. 28. Linear Scales. 30. Profile Projectors. 32. Microscopes. 34. Vision Measuring Machines. 36. Surftest (Surface Roughness Testers). 38. Contracer (Contour Measuring Instruments). 40. Roundtest (Roundness Measuring Instruments). 42. Hardness Testing Machines. 44. Vibration Measuring Instruments.
The sine bars inherently become increasingly impractical and inaccurate as the angle exceeds 45° because of following reasons: ? The sine bar is physically clumsy to hold in position. ? The body of the sine bar obstructs the gauge block stack, even if relieved. ? Slight errors of the sine bar cause large angular errors.
Linear measurement includes the measurement of lengths, diameters, heights and thickness. The basic principle of linear measurement (mechanical type) is that of comparison with standard dimensions on a suitably engraved instrument or device. Linear measuring instruments are categorized depending upon their
Most people's first contact with linear measurement is with a steel rule or a tape measure. ? However, today's engineer has a choice of wide range of instruments to choose from right from purely mechanically operated instruments to digital electronics instruments. ? One has to only consider the nature of application and
A Brief History. The Vernier Caliper is an instrument for making very accurate linear measurements. The instrument was first introduced in 1631 by Pierre Vernier of France. It utilises two graduated scales: The main scale which is similar to that on a rule plus a specially graduated sliding scale (called the Vernier scale).

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March 2018