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What is COUPLING in mechanical engineering - ITI ONLINE NOTE

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 Couplings  1- Shaft transportation problem are usually available up to 7 meters length more length causes as. 2- To have greater length, it is necessary to join two or more pieces of shafts by means of couplings . 3- Connect the ends of two shafts together.  4- Transmit power from one shaft to other shaft.  5- Reduce the vibrations.  6- Provide mechanical flexibility. 7- Permit misalignment of shafts. Requirements of couplings  1- It should be easy to connect or disconnect.  2- It should transmit full power of shaft. 3- It should hold the shafts in perfect alignment.  4- It should have no projecting parts.  Types of couplings  1- Rigid Couplings . 2- Flexible Couplings . Rigid couplings  1- It is used to connect two shafts which are perfectly aligned.  Types of rigid couplings  1- Sleeve or muff coupling .  2- Clamp or split muff couplings .  3- Flange coupling.   > Protected type . > Un protected type . > Marine type  Sleeve or muff coupling 1- Sleeve or muff coupling is th

GAUGE AND TYPES OF GAUGES-FITTER ONLINE NOTE

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  TYPES OF GAUGE 1- Limit gauge 2- Ring gauge 3- Snap gauge 4- Plug gauge 5- Filler gauge 6- Screw gauge 7- Screw pitch gauge 8- Radius gauge and Fillet gauge 9- Wire gauge 10- Fishtail gauge 11- Taper ring gauge. 12- Adjustable caliper gauge. 13- Progressive plug gauge. 1- Limit gauge:- i)- Components manufactured using mass production method are checked only to ensure that the sizes are with in the precribed limits. ii)- The most economical method of checking such components is by using limit gauges. iii)- These gauge are used in inspection because the provide a quick means of checking. 2- Ring gauge:- i)- These are used to check the outside diameter of the work pieces. ii)- Separate gauge are used for checking GO and NO-GO size. iii)- The NO-GO gauge is identified bu an annular grooves, cut on the knurled surface. 3- Snap gauge:- i)- Snap gauge are used as a quick means for checking sizes within certain limits by comparing the size of the parts with the opening of the gauge. 4- Plug