Linear measuring instruments ppt

Line measuring instruments consists of series of accurately, spaced . In this ppt according to BE syllabus linear and angular measurement is try to describe. The instruments of this measurements is described in this ppt. System fundamental unit of length is METER 1. The line measuring instrument have series of accurately spaced lines marked on them.

Most accurate group includes light interference instruments.

Second group includes: optimeters, dial comparators.

Third group includes: dial indicator, vernier calipers . Interferometer, optical flats and limit gauges Comparators: Mechanical, pneumatic and electrical types, applications. One has to only consider the nature of application and . Angular measurements : -Sine bar, optical . Measurements and Precision Measuring Devices. There are various methods of making linear measurements and their relative merit depends upon the degree of precision required. Vernier for angular measurement , indicating 14° 30´.

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.

Learning Objectives At the end of this chapter student should be able to: Enlist the various instruments for measuring angles. Different instruments used for angular measurements. It is necessary because of its precise angular . Classes of Linear Instruments Zero Order Instruments First Order Instruments Second Order Instruments Electronic Instrumentation Lecturer Touseef Yaqoob 11. These are practically replacing the measurement of distances using chains or tapes.

Design of equipment and processes 2. Proper operation control and maintenance of processes 3. Its applies to measurement of length,heights, diameters,thichness, radius etc. These instruments are designed either for line . If the calibration curve is not linear as shown, then the sensitivity varies with the input. Every instrument is designed for different precision and range Precision is the smallest unit (minimum length) an instrument can measure Range is the.

Quick Guide to Precision Measuring Instruments. Dial Gages and Digital Indicators. 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.