LIMITS AND FITS (MALAYALAM)

limits and fits in mechanical engineering, limits and fits explained, limits and fits hole basis, system of limits and fits, limits fits and tolerances malayalam, limits fits and tolerances, what is limits and fits MASS PRODUCTION Mass production means production of a unit, component or part in large numbers. Advantages of mass production Time for the manufacture of components is reduced. The cost of a piece is reduced. Spare parts can be made available quickly. Gauges are used to check the components. Even unskilled workers can be employed for checking. Measuring time is saved. Disadvantages of mass production Special purpose machines are necessary. Jigs and fixtures are needed. Gauges are to be used, hence the initial expenditure will be high. Selective assembly Such an assembly is slow and costly, and maintenance is difficult because spares must be individually manufactured. Non-selective assembly Any nut fits any bolt of the same size and thread type. Such an assembly is rapid, and costs are reduced. Maintenance is simpler because spares are easily available. NON-SELECTIVE ASSEMBLY INTERCHANGEABILITY Non-selective assembly provides interchangeability between the components. In modern engineering production, i.e. mass production, there is no room for selective assembly. However, in some special circumstances, selective assembly is still justified. Interchangeability When components are mass-produced, unless they are interchangeable, the purpose of mass production is not fulfilled. By interchangeability, we mean that identical components, manufactured by different personnel under different environments, can be assembled and replaced without any rectification during the assembly stage and without affecting the functioning of the component when assembled. Necessity of the limit system If components are to be interchangeable, they need to be manufactured to the same identical size which is not possible, when they are mass-produced. Hence, it becomes necessary to permit the operator to deviate by a small margin from the exact size which he is not able to maintain for all the components. At the same time, the deviated size should not affect the quality of the assembly. This sort of dimensioning is known as limit dimensioning. A system of limits is to be followed as a standard for the limit dimensioning of components. Various standard systems of limits and fits are followed by different countries based on the ISO (International Stan dards Organisation) specifications. The system of limits and fits followed in our country is that which is stipulated by the BIS. (Bureau of Indian Standards) Other systems of limits and fits British Standards Systems (BSS) German Standard (DIN) https://youtu.be/g_hAC5TyiYM https://youtu.be/FGsXaUNDUj0 https://youtu.be/Ymxntr-I03Y https://youtu.be/I8i1CixCJsE https://youtu.be/HJfp4xavAl0 https://youtu.be/Q-uOJ4rPIrg https://youtu.be/oXLfb7GI8Bs https://youtu.be/4X1oZ5n0k60