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Mechanical Engineering

SAJAL KUMAR DAS GUPTA

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  1. Like
    SAJAL KUMAR DAS GUPTA got a reaction from Natiq Cabbarov in Why first angle and third angle projection method is used in machine design and why second and fourth angle method is not used?   
    As Mr Karim has rightly answered,In second and fourth angle projection viewing and projected plane are different than that of first and third angle projection,There is possibility that the one projection may overlap the other one creating confusion to understand the drawing.
  2. Like
    SAJAL KUMAR DAS GUPTA got a reaction from Danish Nisar in What is the advantage of providing bush in a bearing? And What is the material of bush?   
    S.K.Das Gupta-I think the question itself needs to be modified as "What is the advantage of providing a bush in a bearing housing in place of bush in a bearing.
    In fact ,the selection of bush bearing or anti friction bearing in a machine depends on the requirement.For example.in a crank shaft of an engine,the big end bearing can be fitted in two halves only.Hence a bush bearing in two halves is used.There is also a space consideration for the machine as anti friction bearing normally needs more space.Also,for very high speed machines,foil bearings are being used as these are very efficient and having a very long life.These days many bush bearings are being replaced with anti friction bearings to get better life and ease of maintenance.So in a nut cell,using a bush bearing/anti friction bearing depends on the function of the machines,it's operating condition,lubricant requirement,space for bearing mounting and many other factors.
    Material of bush may be phosphor bronze,gunmetal,cast iron,thermit or white metal,teflon etc.
  3. Like
    SAJAL KUMAR DAS GUPTA got a reaction from Kweyu in What is the advantage of providing bush in a bearing? And What is the material of bush?   
    S.K.Das Gupta-I think the question itself needs to be modified as "What is the advantage of providing a bush in a bearing housing in place of bush in a bearing.
    In fact ,the selection of bush bearing or anti friction bearing in a machine depends on the requirement.For example.in a crank shaft of an engine,the big end bearing can be fitted in two halves only.Hence a bush bearing in two halves is used.There is also a space consideration for the machine as anti friction bearing normally needs more space.Also,for very high speed machines,foil bearings are being used as these are very efficient and having a very long life.These days many bush bearings are being replaced with anti friction bearings to get better life and ease of maintenance.So in a nut cell,using a bush bearing/anti friction bearing depends on the function of the machines,it's operating condition,lubricant requirement,space for bearing mounting and many other factors.
    Material of bush may be phosphor bronze,gunmetal,cast iron,thermit or white metal,teflon etc.
  4. Like
    SAJAL KUMAR DAS GUPTA got a reaction from Pavan Kumar Potdar in What is the advantage of providing bush in a bearing? And What is the material of bush?   
    S.K.Das Gupta-I think the question itself needs to be modified as "What is the advantage of providing a bush in a bearing housing in place of bush in a bearing.
    In fact ,the selection of bush bearing or anti friction bearing in a machine depends on the requirement.For example.in a crank shaft of an engine,the big end bearing can be fitted in two halves only.Hence a bush bearing in two halves is used.There is also a space consideration for the machine as anti friction bearing normally needs more space.Also,for very high speed machines,foil bearings are being used as these are very efficient and having a very long life.These days many bush bearings are being replaced with anti friction bearings to get better life and ease of maintenance.So in a nut cell,using a bush bearing/anti friction bearing depends on the function of the machines,it's operating condition,lubricant requirement,space for bearing mounting and many other factors.
    Material of bush may be phosphor bronze,gunmetal,cast iron,thermit or white metal,teflon etc.
  5. Like
    SAJAL KUMAR DAS GUPTA got a reaction from Vijay Varma in Difference between pump and compressor   
    S.K.Das Gupta-Basicallly pumps and compressors perform similar work.Both deliver flow with pressure.If the delivery side of the pumps and compressors kept opened without any reduction in pipe opening,we don't get higher pressure on the delivery side of the machine.A compressor is capable of delivering fluid of rated volume at rated pressure.In case of centrifugal pumps (single stage),if the delivery port is blocked or partially opened,the delivery pressure will rise slightly with reduced flow causing no damage to the equipment but in case of compressor(Positive displacement pumps,reciprocating and screw compressors),serious damage may be caused to the machine if other safety system do not work.
    In short,both pumps and compressors deliver rated amount of flow..Pumps (Single stage) deliver at a lower pressure compared to compressors.We should not get confused with the terms as in some countries.oil pump is called an oil compressor.Also,since oil/water are incompressible,we term the machines handling these liquids as pumps.similarly,gases,air are compressible,we term these machines as compressor but there is no specific boundary line in between the two.
     
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