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  3. Want to achieve very slow speed of 0.5mm/sec for linear motion ,this is required for special abrasion purpose , is there any way to realise this mechanism because using the regular gear ratio technique i.e Rack and pinion , pinion( dia being 75mm minimum is the design restriction due to torque transmission 115 Nm) Gear ratio is required very high , is there any other way we can realise??
  4. Hey Everyone! Hope you are having an amazing day! As Engineers we run on a very busy schedule and that makes it hard sometimes to be able to devote some time to change our health and bodies. There is a lot of information out there about diet/exercise that get people no where and leave them frustrated. I'm currently trying to find out how I could fix these issues for IT Professionals and make gaining muscle and losing weight simpler. I am about to start my own business as an online consulting coach on fitness. I want to help men gain muscle, lose fat and become more muscular in a body that they feel confident. Which is why i have two very simple questions: As someone very busy as you, are you experiencing issues with gaining weight / losing weight? if so what do you think are the two main issues you are dealing with ? I am not promoting or selling anything only recommendations and constructive feedback Thanks so much in advance Looking forward to reading your answers
  5. I have analyzed trusses for class work, but never in professional practice. In homework I am given the geometry and the applied loads, and asked to find the loads or stresses in members, not too difficult. But coming from a blank paper where do you start to design a truss or bridge, with so many types to pick from? For a simple beam I know what to do. For a complex truss, vs suspension bridge how is this decided before all the detail analysis starts? In the attached photo the bridge over the RR tracks (right side) is a truss. Over the road way a different type. I assume the RR needs more clearance and puttinging the "depth of the beam" above the road way, provides the clearance. But why not a truss across the entire span, or the other type raised higher and extended. I assume there must be a significant cost difference but I have no practical experience to support this. Also I have seen bridges with a truss as show then other with the truss under the road bed or tracks for RR bridge. What drives the design?
  6. What Would You Like to Know? If you could ask me any question you want, what would you like to know that you think I might know? I certainly do not know everything, but through the years I have accumulated a certan amount of knowledge that I'd like to pass on to you. Therefore, I ask, what would you like to know? Many readers are still in college, and no doubt they would like to know what is going to be on the next exam. I'm sorry, but I have no way to know that. What I might be able to tell you is some examples of where your present studies might be useful in the future. I recall my own student days, and I often wondered, "Where am I going to need to know xxxx?" I simply could not imagine where xxxx might arise in the future. Other readers are out of college and in the industrial workplace. Some are doing fine with the knowledge they acquired in school, but others are discovering that they need knowledge and skills that were not taught in college. I know that this certainly happened to me. When I went out into industry, there were all sorts of problems that had never been mentioned in my college days and presented me with new learning challenges. That is a part of being an engineer; your whole career is a learning experience. At the same time, there are many situations where you might like to ask someone with more experience about a particular topic. So, I repeat, "What would you like to know?" Please comment on this blog post and give me your thoughts. DrD
  7. This Tutorial video shows you how to make a tool with a spring and bolts. Simple and useful.https://www.youtube.com/watch?v=y79--niM3rM
  8. Thought this would be encouraging to anyone thinking of going into engineering https://www.onlinecomponents.com/blogpost/173-why-an-engineering-career-is-a-smart-choice
  9. That does seem like it could be a solid way to do detailed dynamics, but I'm not sure it will be good for developing what I need. I appreciate the suggestion though!
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  11. I can't help much with resources for writing it yourself but I can point you to some tools. I've never used it but you can check out MBDyn (https://www.mbdyn.org/), it's an open source multi-body solver. For paid tools with a GUI check what dynamics tools are available with your CAD package. For something more advanced some of the big MBD companies have "lite" versions which are good for fully rigid systems like this, google "mbd lite".
  12. This is a work project, but it will only be used internally, and I am just looking for resources. I am not interested in having someone on the forum write it for me.
  13. Is this a project for fun where you want to write the code yourself or is this something for work where you'll use commercial software?
  14. Hello ! if I want to use sealed bearings (for making maintenance much easier) and it is not enough with 1 ball bearing, is it correct to use 2 radial ball bearings in tandem? (not angular bearings, just regular radial ball bearings like a 6208 2RS) This is for a shaft with no axial forces. Of course, it would be 4 bearings in total, 2 + 2. Thanks !
  15. An Introduction to cryogenic valves An Introduction to Cryogenic Valves-3.pdf
  16. Hello! I have to make a simulation for a vehicle and trailer that can show the response to a quick swerve. I am planning on making it reasonably accurate, basically just showing if the trailer is stable or not and what its response time/dampening ration would be. I can find out almost any physical aspect about the trailer for the model, but I am not very familiar with dynamics/kinematics, and it seems like that's the avenue to take. I have done some research, and it seems as if everyone is treating similar examples as rigid body motion in a plane. Generally I have only found examples of the trailer being linked to the midpoint between the back tires similar to a 5th wheel or goose neck hitch. For my simulation, I need it to be be similar to a common consumer hitch, mounted back several feet form the axle - meaning when the car turns to the left the hitch moves slightly to the right. I assume that is just taking another vector into account but I am not entirely positive. Does anyone have any good examples of this, or would be able to help setting up the initial equations? I have several books to read through but I was hoping to avoid starting at the most basic level and teaching myself a 510 masters class at work.
  17. Can u describe how the project begin? And how many employee who contribute
  18. Я предлагаю совместную реализацию Программы «Безопасный город»

    Well + Luke + Castle МЫ ЗАЩИЩАЕМ ЧАСЫ И КАБЕЛИ В ИХ


    Я разработчик и владелец патентов на специальные замки для люков Уэллса.

    The Safe City program deals with the solution of Our common problem - the disappearance of manhole covers and dangerous open wells, which are still getting bigger on the streets.

    The problem of open wells exists now practically in all the republics of the former CIS and our near and far abroad - England, Poland, USA, India, Bulgaria, China ...

    We conduct basic negotiations with the Housing and Communal Services Departments of the Oblasts, cities and directly with the housing and utilities enterprises - Vodokanals and City Heating Networks. We are also negotiating with telecommunication companies - UkrTelecom, RosTelecom, Internet service providers, etc.

    The cost of frequent purchases of new materials and components (hatches, cables, valves) for the proper and high-quality work of housing and public utilities, Telecom, the Internet, which are now very often lost, are big losses.

    After the establishment of special locks on the hatches of the wells, the economic problems of the Cities are solved first of all - the covers of the hatches, which are expensive, will cease to disappear, the cable-conductor and communal products under them.

    And most importantly, the number of injuries among people and car accidents will decrease.



    https://www.facebook.com/bezopasgorod https://www.facebook.com/bezopasssgoroda https://www.facebook.com/dmitry.rod https://www.facebook.com/bezopas/ https: / /www.facebook.com/bezopasgoroda/ https://www.facebook.com/bezopasgorodamira/ https://www.facebook.com/groups/bezopasgorodlydiam/                                                                                                                                                                                                                                                  

    Linkedin   https://www.linkedin.com/in/ дмитрий - родь

    Google     https://plus.google.com/u/0/+ ДмитрийРодь

    Twitter    https://twitter.com/BEZOPASGORODAM                                                                                                                                                                                         

    You Tube   видео демонстрация                                                                                             









    Сайт городской газеты http://www.44.ua/article/969758     

    ОБЗОР http://o.kr.ua/ru/krivorozhanin_predlozhil_deshevyj_sposob_borby_s_krazhej_lyukov_video.html  

    Buildig TECH https://building-tech.org/izobretatel-iz-ukrainy-predlozhil-deshevyj-sposob-borby-s-krazhej-ljukov-video/     

    Первый Городской Телеканал                                                              






    Готовы к плодотворному сотрудничеству.

    С уважением, руководитель проекта, президент «Безопасного города» Род Род Валентинович.       

    Т / Р . +380966297352; Электронная почта : bezopasgorod @ gmail . ком скайп : безопасгород

  19. Right .... friction, heat and viscosity!! think i'll find my answer.. thankyou
  20. Look up the definitions, and you will have your answer. DrD
  21. If you are looking for steady operating power, the SumTorq = I * alpha does not help. In steady operation, all of the power input must be converted to heat. Where is it going? What are the torques that act on the system in steady state? Perhaps some viscous drag? Is there a brake? Is there a friction rub? Find these and figure out how much power they consume at operating speed. That is the required input power.
  22. need input from individuals, i considering this as my final year project
  23. Just few words for this: A well explained answer.
  24. Thankyou DrD for replying, well let me describe you the procedure : i)The process department defines the tip velocity & OD of the rotor required to process a substance. ii)So, Well get the required RPM of the rotor (v=rω) ,and we need the rotor to run steadily at this rpm iii)Rotor Design is Confirmed, and say I find a rough MMOI ....................................................................................................................... Now, How do I find the Power Required to run the rotor steadily at say 1400 RPM?? And I do know that a high initial torque is required to get the rotor from 0 to 1400 RPM, How to find this initial Torque?? I did try using T=I(moment of inertia) x α(angular acceleration) I know the MMOI , and α = dω / t where dω will be 2*pi*(1400-0)/60 Now here's the problem HOW ON EARTH WILL I BE ABLE TO GET THE TIME 't' ??!
  25. In what context? For what purpose are there benefits? DrD
  26. The notches at the ends of the slot look like stress concentration factor relief. The small rib on the side wall can't be that at all. They may all be artifacts of the extrusion process that forms the section. DrD
  27. Well, are you trying to accelerate this rotor, or are you concerned only with steady running? You have to define the problem before it can be answered. As for the mass moment of inertia, you can't calculate such until you have a proposed design. After you define a design, you can calculate the MMOI and see if the system performance is satisfactory or not. On the first try, it often is not, so you propose a better design and try again. This is why design is described as an iterative process. DrD
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