Linear Measurement: DESIGN OF LINEAR MEASUREMENT INSTRUMENTS

Linear Measurement the methods by which engineering standards of length are established were discussed. Both direct and indirect linear measuring instruments conform to these established standards of length and provide convenient means for making accurate and precise linear measurements. Vernier calliper and Vernier micrometre are the most widely used linear measuring instruments in machine shops and tool rooms. Measuring instruments are … Read more

PLAIN PLUG GAUGES: Plain plug gauges are designated by specifying, Single- ended GO and NOT GO plug gauges, Double-ended plug gauges and Progressive plug gauges

PLAIN PLUG GAUGES Gauges that are used for gauging holes are known as plug gauges. Plain plug gauges are manufactured using hardened and stabilized wear-resistant steel. The gauging surface of the plug gauges are ground and lapped to make it smooth. The surface of these gauges is hardened to not less than 750 HV. Handles for these plug … Read more

FITS: Clearance fit, Interference fit, Transition fit, Allowance, Hole Basis and Shaft Basis Systems

FITS Manufactured parts are required to mate with one another during assembly. The relationship between the two mating parts that are to be assembled, that is, the hole and the shaft, with respect to the difference in their dimensions before assembly is called a fit. An ideal fit is required for proper functioning of the mating parts. Three … Read more

Classification of Tolerance: Unilateral tolerance, Bilateral tolerance, Compound tolerance, Geometric tolerance

Classification of Tolerance Tolerance can be classified under the following categories: 1. Unilateral tolerance  2. Bilateral tolerance  3. Compound tolerance 4. Geometric tolerance Unilateral Tolerance When the tolerance distribution is only on one side of the basic size, it is known as unilateral tolerance. In other words, tolerance limits lie wholly on one side of the … Read more

Classification of Gauges

Classification of Gauges The detailed classification of the gauges is as follows: 1. Plain gauges (a) According to their type: (i) Standard gauges (ii) Limit gauges (b) According to their purpose: (i) Workshop (ii) Inspection (iii) Reference, or master, or control gauges (c) According to the form of the tested surface: (i) Plug gauges for … Read more

METAL JOINING PROCESS: GAS Welding, Difference between Gas Welding and Arc Welding, Arc welding, Electrode and special welding processes

METAL JOINING PROCESS Welding Welding is a materials joining process which produces coalescence of materials by heating them to suitable temperatures with or without the pplication of pressure or by the application of pressure alone, and with or without the use of filler material. Welding is used for making permanent joints. It is used in the manufacture of automobile bodies, … Read more

Railway track engineer

Railway track engineer The Railway Track Engineer is responsible for the design, installation and maintenance of railroad track. This includes performing surveys, preparing drawings, and overseeing construction. Responsibilities: Perform surveys to determine the location of new track construction; prepare drawings and specifications Plan layout and design of new track; oversee construction work Ensure that the … Read more