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Mechanical Engineering


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SAJAL KUMAR DAS GUPTA last won the day on May 29 2019

SAJAL KUMAR DAS GUPTA had the most liked content!


  • Birthday 09/03/1947

Profile Information

  • Interests
    Modification to machines(Mechanical) to achieve power saving,ease of maintenance,Optimizing equipment life,improvement in safety,reducing cost of maintenance and downtime.Also passonate about new invention
  • Present Company
    ACC LTD,India
  • Designation / Job Title
    Consultant for technical training
  • Highest Qualification
    Science graduate
  • Year of completition
  • Year of completition

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  • Yahoo

More Information

  • Project Undertaken
    Numerous projects from commissioning new cement plants,number of power saving projects,eliminating bottlenecks in machine operation and maintenance,analysing machine failures and providing solutions.
  • Achievement /recognition/ Certifications
    Designed,Fabricated,installed and commissioned pneumatic actuator power economizer.This project was published in World Cement magazine

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  1. Least count is the value of one division of vernier scale.Since we take the vernier value with the particular vertical line of vernier scale that exactly concides with the vertical line of main scale while measurement,we have to add this value with main scale value.For example say,n th line of vernier scale matches with a particular division of main scale,the final reading will be value of main scale reading+value of n th line of vernier scale x Least count(i.e value of one div of vernier scale).
  2. Provide turn buckles on both legs of table on each side of extensions.The turn buckles will connect extreme ends of extensions underside and pair of legs on each side through hinge pins.After fully extending the extensions both hinge pins will be inserted into matched holes of extension board/one end of turn buckle and table leg/other end of turn buckle and then turn buckle will be turned to make rigid support.When extension pieces are retracted fully,the turn buckles will be removed by removing pins and stored safely for further use when required.
  3. Different lubricants are used in different type of application.For example,an industrial fan can be fitted with an anti friction bearing,or a bush bearing which might be lubricated with oil or grease depending upon various factors viz load,RPM,temperature,environmental consideration but surely lubricant like graphite powder or air or viscolite can not be used.Similarly for a large multistage submersible water pumps grease can not be used in place of water as lubricant.An aerofoil bearing used for very high speed machines,oil can not be used in place of air.An elevator conveying pulverized material uses conveying material as lubricant for its bottom drum bearing.. In a nut cell,different lubricants are for different uses and can not be used in place of one another against recommendations by machine designers.
  4. The horizontal plate should cool faster since it's top surface is in contact with atmospheric air which is applied vertically to surface of the plate to dissipate heat faster. The answer is only a logical response and not intricate engineering solution.
  5. NDT is closely related to mechanical engineering as the test results are correlated to mechanical engineering on many occasions and decisions are taken accordingly.I will quote only one example in this regard. Radiography of a new large gear reveals that it has got some flaws in in the casting at it"s hub area.Now a mechanical engineer knows the type of load the will be subjected to when erected and commissioned.Now just because of a small flaw in the casting of the gear,he will not reject the item outright.instead,he will examine it thoroughly considering various operating operational parameters and may accept the item .So a mechanical engineer is an integral part of decision making with regards to test report of NDT.
  6. Why do you want to waste power by using a centrifugal pump(Fluid) having more expensive construction and higher power requirement rather than using a less expensive machine requiring much less power centrifugal blower?
  7. You could try a spring return small limit switch to be suitably located at the travel end of the cylinder rod in such a way that during every stroke,the end of piston rod pushes the switch pin gently and the pin comes back to its original position once the rod end starts its retraction. This pulse is to be measured per unit of time to calculate the cycle of operation.
  8. Please explore 1.Weather machine RPM can be changed. 2.Consider resonance factor.Look for possibility of change in natural frequency of machine structure/Foundation.
  9. Photographs along with sketch/drawing of shaft assembly with name of components will be very much appreciated.Thanks for sharing.
  10. You may explore using a PIV gear box(Hydraulic) PIV refers to Positive Infinite Velocity
  11. In the given condition,a multistage centrifugal pump designed for a suction lift of 25 mtrs or more may be explored.I am not aware whether a centrifugal pump is being manufactured having above specification. Alternatively,suitability of a booster pump down the suction line of the existing pump may be explored.. If condition permits,a submersible pump will be a better option,
  12. Preheating for uniform flow of heat through the metal to avoid stress and cracks.Post heating and controlled cooling after completion of welding to relieve stresses.
  13. You may analyze whether intermittent high pressure has got anything to do with level of solvent in the storage tank? assuming your transfer pump is a positive displacement pump delivering solvent at 40 psig,please have a look weather flow of solvent gets restricted during high pressure build up. For proper analysis,few more inputs like flow diagram,pump specification and related operational data is made available from your end.
  14. In most of the products made as per design need some modifications after the product has been practically tried and this can not be termed as failed design Also,a perfectly designed machine may fail during use due to number of other related factor such as operational parameters like pressure,temperature,environment,load,speed.Also,it must be ensured that the personnel operating the machine have got necessary technical skills. In short,before declaring a failed design,thorough analysis must be carried out to pin point the cause of failure.
  15. In a centrifugal pump used for negative head installation,suction head at site must be considered while selecting the pump.
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