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  3. Hello everyone, I'm not entirely sure if this is the right place to ask this question, but I'm not sure where else it would go. I've heard from someone who used to work in the industry that oil and gas companies have seamless pipe expanders, with smooth and flexible exteriors, that go inside a pipe, then increase their OD using hydraulic pressure to expand the pipe. So, like an inflatable pipe plug, but strong enough to actually yield the metal. He described it as looking like an air suspension bag for a car. (NOT like a hydraulic pipe expander that simply uses a hydraulic ram to force a tool into a pipe, enlarging it as it does.) I can't seem to find this anywhere. Does it not exist, or is my Google-fu just weak? Thanks, Alex
  4. Did you know, why sheet metal design services is drastically growing due to demands of manufacturing firms & metal fabrication sectors? Well, it's obvious causes why sheet metal design is so popular in various industries, due to benefits like customization, time & cost saving, DFM (Design for manufacturability), compatibility in product development process, and most important 3D models and flat CAD drawings. Have a look here some good conceptual 3D Solid Models and drafting images. This gallery about Sheet Metal Fabrication Design, 2D CAD drawings & 3D models.
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  6. Hi, I would like to get some ideas to answer this question for my assignment. A lift design seem overdo it since the requirement only need to move the load within 400mm.
  7. To install an eligible installation means to build and/or put in place the relevant plant. To 'commission' a plant means to carry out all necessary tests and procedures required by industry standards to show that the plant is able to deliver heat for the purpose for which it was installed. For smaller scale installations, installation and commissioning may happen on the same day. However, for those dealing with the larger scale, there is usually a significant testing period, so the date of installation and date of commissioning may be different.
  8. torque is the capacity to do work, while power is the rate of completing work (or applying torque) in a given amount of time.
  9. DrD


    The simple answer is "yes, there is evidently something wrong with your calculations." Now you will probably ask what is wrong. That is harder. Where did you get the data for your calculations? What do you think you are calculating? To just through out a bunch of numbers with no statement of your approach to the problem is pretty meaningless. DrD
  10. starly

    Blower Type

    Hi, hope you can help me. What kind of blower and specifications should be used to transfer semolina from elevation of approx 45 meters? It needed to transfer 5.1 tons per hr. Thanks
  11. Hi SIMarEST, Thank you for your answer. I already contacted the manufacturer but that is all the information they can provide. For now the calculation that I used to obtain the Young's modulus is by using the given tensile strength and elongation data provided. E = Stress/Strain = 41MPa/0.1 = 410MPa where stress is taken from tensile strength as 41MPa and strain is by converted from elongation as 0.1. For the density I calculate by using the specific gravity ρ=SG×ρ_w=1.1(997)=1096.7k g/m^3 Is it correct? Also how can I find the Poisson's ratio? could you elaborate more about this.
  12. Have you downloaded a copy of my Theory of Machines text available at this web site? If not, I suggest you might want to do so. While this problem is not given there, a lot of similar things are discussed. Take a look. DrD
  13. I want to shear 3mm diameter mild steel bar using a motor that converts rotational motion to linear motion. The motor is fitted with a triangular positive action cam with minimum dia 36mm and maximum dia 90mm. According to my calculations force required to shear 3mm bar = 3.14x1.5mmx1.5mmx 300mpa = 2119.5 N. Motor torque is 112.5Nm at the required rpm. The cam travels upto 33mm (radius)for the required stroke. Hence, t= f x r Therefore, f= t/r F= 112.5/0.033 = 3409N However, in practical application, the wire is not getting cut. Is there something wrong with my calculations?
  14. Dear colleagues, Please have a look at the three links below. 1) https://mypicxbg.fil...pages_01-12.pdf 2) https://mypicxbg.fil...5/figs01-08.pdf 3) https://mypicxbg.fil...have_a_look.pdf The first link contains the text, and the second link contains the related Figs.1-6. The two links form one united whole. The third link is a very important addition to the first link and to the second link. Besides the concept is published in http://www.scienceforums.com/topic/36123-is-this-a-reactionless-drive/ and the related post of 05 September 2019, 10:55 AM. Is this a reactionless drive? As if there isn't any contradiction at all? Looking forward to your answer. Regards, Peter
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  16. Well, I got one good comment from JAG. I presume that means that he and I are the only folks left who don't know everything. I suppose that stands to reason; we are both old men! I had no idea the rest of you were so brilliant and over-informed! To answer JAG's question, "What drives the design?" let me respond by saying "many factors." We might consider -- * cost and availability of materials (steel, concrete, stone, etc); * cost and availability of a work force familiar with construction in various materials; * cost and availability of machines to fabricate and erect the various bridge types; * local and national laws and ordinances regarding height of structures, visibility blockage ("must not interfere with airport approach," "don't block the view of the mountain or the lake"); * past experience of each designer/erector (some have never worked in steel but have lots of experience in concrete and vice versa); * opinions on aesthetics of various bridge types (suspension bridges look graceful, etc), There are probably some more factors, but this is a start. DrD
  17. Best blog of Freezer truck and chiller van services in Dubai and Abu dhabi at affordable and professional services by Freshandcooltransport.com


  18. I am a Final Year Student. And I want to pursue a Designing Based Job. So..Is it necessary for me to do some intership ? If YES then what type of internship should I do and How? Thank you!
  19. A various CAD drawings, drafts and 3D models which frequently used for different industrial vertical such as manufacturing, design engineering, construction, sheet metal fabrication, and furniture industry.
  20. Universal Testing Machine, Hardness Testing Machine, Compression Testing Machine, Erichsen Testing Machine, Laminated Spring Testing Machine, Torsion Testing Machine, Impact Testing Machine, Dynamic Balancing Machine, Manufacturer, Kolhapur, India.
  21. Hi Kamal They have given the tensile strength....and the material specific shear strength on p2. The Poissons ration can be back calculated from this. Youngs is a little more problematic...no info. but hopefully this helps. That said it may not be the best solution for carbon fibre...even if it is, make sure you do your surface prep! Have you tried emailing their technical help team...?
  22. KAPLAN TURBINE 1. Efficiency is high 2. water axially in axially out 3. no. of blade is less 4. Less pressure head is required FRANCIS TURBINE 1. Efficiency is less 2. Water radially in axially or radially out 3. No. of blade is high 4. high pressure head is required
  23. Minimal in Radial; pump Maximum in Axial pump
  24. Peter5


    Dear colleagues, Please have a look at http://www.scienceforums.com/topic/36123-is-this-a-reactionless-drive/ and the related post of 05 September 2019, 10:55 AM. Is this a reactionless drive? As if there isn't any contradiction at all? Looking forward to your answer eagerly. Regards, Peter
  25. Standard gear boxes ie used in all mobile swing and motion control, have lubrication oil internal. So add a 2 ports ( fill and Drain) , make sure housing is sealed, for Baja I would go with a ISO220 gear lube good characteristics at high temp. Key will be gear speeds, very high gear speeds can create oil shear. Note Noria.com is a excellent source for information on all types of lubrication. good basic tutorials as well.
  26. Mark Torbett

    Linear actuator

    This is a geared electric actuator, with sync stages for extension, meaning all stages move simultaneously. Honestly the key factors for you you seems like the following 1) Collapsed height, 2) Max stroke for final length, 3) connection, this design only really works for a straight vertical RAM lift. 4) Load- what is real initial load and the dynamic load including acceleration, ie dynamics 101. In the end there are tons of excellent actuators on the market, but key on these is speed, mm/sec and load newtons (dynamic). Also environmental conditions: out door, in door, salt spray, IP sealing rating and finally, same load mount issues as a hydraulic cylinder, clevis clevis with spherical rod mounts- Info shown is pretty basic but not applicable to a actual real world move a load application,
  27. Linear actuators using small electric variable motors can get very very low speeds with high speeds. But your issues is beyond speed if you are doing abrasion, then loading is critical so how you are applying the load is as critical as the speed component. Very high loads at very load speeds create issue with variable friction etc. The design layout / structure is as critical as speed. So what is the power component Torque/force is as critical as speed (n). But if you want to achieve very low speeds then review linear bearing assemblies or linear actuators. Thomsen linear actuators is a excellent source for solutions for all environments.
  28. Hi everyone! I am currently working on a project for CERN as part of a university course. The aim is to identify new fields of application for a high-tech coating method that has some special features. Since my technical knowledge unfortunately limited, I would be interested to know whether, from your point of view, the following advantages of the technology could be required for the production of certain parts in your specific industry or area of expertise. The concrete advantages of the coating process are: Coating of complex and even smallest 3D structures possible More durable end products due to increased density, surface quality and hardness during the coating process Application of very thin (as well as very thick) layers possible I would be very grateful if you could share your opinions and views with me. Thank you very much!
  29. 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??
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