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  • K. Ouajjani's Avatar
    Today, 09:00
    Finite Element Analysis (FEA) is a key step in the design process. In fact, industry now commonly requires a calculation analysis sheet from design departments to approve the final virtual product. Moreover, FEA is an essential tool for developing a mechanism, calculating its lifecycle, and improving it in a number of ways. To speak of its importance would take pages by itself. In this article, we will focus on how to make FEA easier and faster by improving CAD practices. Although FEA can pretty much handle any shape you throw at it, it will still compute false alarms and/or require a lot of time and attempts if the CAD model is complex. Therefore, below are 10 tips to help you make your CAD models more FEA friendly: 1) Symmetry helps Make a part symmetrical or mirror its features where possible. This will make reproducing the FE model much easier. Besides, symmetry gives an optimal balance for inertia, and this is always better for a mechanical system. 2) Rotational...
    replies | 5 view(s)
  • engineeringdesign's Avatar
    Today, 05:23
    Go for Rapid prototype is good and cost effective....
    12 replies | 4510 view(s)
  • Erich's Avatar
    Yesterday, 23:33
    Datums are just ways of labeling features. They become primary, secondary, tertiary by how they are located in individual feature control frames. A round feature can be a primary datum for the control of some feature. It can be a tertiary feature for the control of yet another feature. It all depends on how the part functions and how you the designer need to control the allowable variation in the part. GD&T is a language, it has many letters and words. You are the author and how you put them together depends on what you want to say.
    1 replies | 214 view(s)
  • Dana's Avatar
    Yesterday, 21:47
    No he can't...
    274 replies | 24931 view(s)
  • nikita_mech_design's Avatar
    Yesterday, 21:31
    There are several parts to this effort. Bond paper roll being stretched between 2 paper feeders on wheel bearings Precision positioning of the roll to a coordinate system devised for that roll That is if the paper roll is 35 meters long or 35'000 mm and 914.4mm wide I could choose a point on that roll say x=10567 and y=804 (where x=1 is 1mm offset y=1 is 1mm offset on the y axis) and have that point moved to a specific spot on the part of the roll between the shafts that is stretched and forms a long visible surface(writable with pen or other means area). Imagine the distance between the two rolls increased significantly and the first roll of paper tuck in or be held on the second spindle/shaft.... The idea is to be able to roll back and forth from the left roll to the right so as to achieve a precise positioning to a specific portion within the roll. The position requested by choosing a point on the entire roll i.e. 3'500 mm(3 metres and 50 cm) on x and have that be...
    0 replies | 0 view(s)
  • miltonbr's Avatar
    Yesterday, 19:12
    "The mechanism which breaks the third law of Newton" ..... right ..... and I am the joker???? Did you notice that searching for mr. Kanarev on google we get no, absolutely no serious science page? Professor of theoretical mechanics in the Kuban State Agrarian University .... come on Paul! You can do better than that.
    274 replies | 24931 view(s)
  • Paul T's Avatar
    Yesterday, 15:31
    Pages 29 & 30 of: https://www.dropbox.com/s/l6pass1sw1wei5g/F5A.pdf The invention relates to inertial systems for the accumulation and conversion of energy, and can be used as a power unit to drive various machines and vehicles. According to the disclosed method, a source of mechanical oscillations is used to generate an alternating rotational torque which is applied to the working train made capable of unidirectional rotational motion. An inertial vibrator disposed axially on the working train is used as the oscillation source. The power unit putting the method into practice comprises an electrical generator, a control device and a power drive, including a base on which a first assembly is disposed, with the capability of unidirectional rotation and including a driving train for the transmission of operating torque and a motor with the capability of free rotation of at least one member with unbalanced mass on a shaft disposed on the first assembly axially relative to the...
    274 replies | 24931 view(s)
  • Paul T's Avatar
    Yesterday, 15:16
    Well, this was my original idea for proof of concept. I got swept up in the idea of reducing my own main electricity consumption in the process. This is still my goal. However, proving it this way seems totally sceptic proof! This is what I want. I haven't got the money to go the Kanarev route, nor do I know how to implement the electronic clutches. So box section steel frame to accommodate my new bigger flywheels coming up next!
    274 replies | 24931 view(s)
  • Paul T's Avatar
    Yesterday, 15:11
    Here is Kanarev's "Introduction to Mechanodynamics" https://www.dropbox.com/s/mzugqcsvhobkcex/INTRODUCTION%20TO%20MECHANODYNAMICS.doc Here a website with almost every book / article / paper Kanarev has written. http://www.guns.connect.fi/innoplaza/energy/story/Kanarev/index.html
    274 replies | 24931 view(s)
  • Prashant BR's Avatar
    Yesterday, 11:14
    Super... Thank you for your suggestion.
    1 replies | 138 view(s)
  • dlyris's Avatar
    Yesterday, 09:06
    We are currently looking for a Junior Base Station MPE System Designer to our Engineering centre (MPE) in Kista to take part in system design of future products. The work will include requirement capture, logical architecture design etc. However the focus for this position will be on physical architecture and concept creation. The work will be done in close cooperation with our system teams in Kista and at head office in China. (MPE = mechanical, power and Environmental (thermal) engineering) Qualifications You have at least 5 years of experience within system design (R&D) of hardware and of these 5 years we would appreciate 1-2 years of experience of Telecom radio products. You have previous experience from all system design related process steps from requirement capture to conceptual design and also within possible site configurations. General knowledge of the RF area is appreciated. For this position we also value experiences of the ‘platform, concept & product...
    0 replies | 55 view(s)
  • dlyris's Avatar
    Yesterday, 09:06
    We are currently looking for a Senior MPE Research engineer to our Engineering centre (MPE) in Kista to take a lead in several technology studies for our future products. The work will be to perform technology surveys, to scan the ongoing research activities in northern Europe inside research organisations, to identify possible cooperation areas and to drive the Huawei part of the research cooperation projects started. The work will be done in close cooperation with our technology planning team at head office in China. (MPE = mechanical, power and Environmental (thermal) engineering) Qualifications You have at least +5 years of experience of research activities and a clear or hands on experience of at least one of our competence areas, i.e. thermal, mechanical and/or power distribution design. You have good understanding of telecom system design and of conceptual design within the telecom industry. For this position it is a must that you have a good understanding of...
    0 replies | 45 view(s)
  • dlyris's Avatar
    Yesterday, 09:05
    As an industrial designer, you´ll work as a team-player in multidisciplinary teams or in a more independent way, to create successful products for a global brand that tell solid stories and provide great user experience. You will be asked to generate innovative and waterproof concept designs with a User Centered Design approach: You will be asked to carefully shape products down to the very detail to make life easy for the users. You will conduct field-research and synthesize results to guide concept design phases. You will aim at a rationalist, minimal and elegant design, always consistent with requirement specifications and fitting into a greater product portfolio design language. You will be challenged to ideate mechanic and kinematic solutions to be developed jointly with engineering teams. You will ensure the feasibility of your ideas by exploring alternative solutions in terms of product architectures, material and manufacturing processes. You will test and...
    0 replies | 52 view(s)
  • dlyris's Avatar
    Yesterday, 09:04
    As industrial designer, you´ll work as a team-player in multidisciplinary teams or in a more independent way, to create successful products for a global brand that tell solid stories and provide great user experience. You will be asked to generate innovative and waterproof concept designs with a User Centered Design approach: You will be asked to carefully shape products down to the very detail to make life easy for the users. You will conduct field-research and synthesize results to guide concept design phases. You will aim at a rationalist, minimal and elegant design, always consistent with requirement specifications and fitting into a greater product portfolio design language. You will be challenged to ideate mechanic and kinematic solutions to be developed jointly with engineering teams. You will ensure the feasibility of your ideas by exploring alternative solutions in terms of product architectures, material and manufacturing processes. You will test and...
    0 replies | 52 view(s)
  • dlyris's Avatar
    Yesterday, 09:03
    Key Words: Project management, concept design, concept evaluation, Engineering, mechanical design, thermal design, MPE (Mechanical, Power & Environmental), Installation, Supply chain optimisation, Design For Manufacturing. Responsibilities We are currently looking for an object leader to our Engineering competence centre to take on the challenge to plan and lead the design a future radio solutions. The work will be done in very close cooperation with our system design teams in Kista and Gothenburg and our head office in Chine. This is a technical role, not an administrative role. Qualifications Required We require at least +2 years of experience of driving studies of telecom concepts, with thermal or mechanical focus. This has given the candidate a deep understanding of the buildup of telecom radio solutions for harsh environmental conditions, of installation requirements and of the thermal & EMC challenges. We hope that the candidate can take part in site solution...
    0 replies | 65 view(s)
  • dlyris's Avatar
    Yesterday, 09:02
    We are currently looking for a Senior Thermal Research specialist to our Engineering competence centre in Kista, to take on the challenge to design and compare our future cooling concepts, on detailed design level and on system level. We expect this specialist to be responsible for a management of technology studies in the electronic cooling design area The position will also include responsibility of Thermal analysis of various telecom equipment including requirement specification analyses. The work will be done in very close cooperation with our system design teams in Kista and our head office in China Essential Skills required (as many from list below): We expect the candidate to have more than 8-12 years experiences on thermal design of telecom equipment and that this have given the candidate a thorough and deep understanding of cooling of electronics and a wide experience of CFD programs like: Ice Pack, Flotherm, etc We also expect an expertise of conceptual...
    0 replies | 39 view(s)
  • dlyris's Avatar
    Yesterday, 09:01
    Key Words: Mechanical Design, Base station, Radio unit, Tower mounted, RFU, TRU, filter Responsibilities We are currently looking for a Senior mechanical design engineer to our Engineering competence centre to take on the challenge to plan and design the build-up of our future RF concepts. The work will be done in very close cooperation with our system design teams in Kista and our head office in China Qualifications Required We require at least 5-10 years of experience in mechanical design of RF concepts and products. I.e. RFU’s, TRU’s and RRU’s This means mechanical design experience of products with the high quality and the performance normally related to Radio products. Products that must also achieve low cost and high reliability and that are aimed for a high volume production. We believe that this has given the candidate a deep knowledge of the die-casting process, of extruded/machined products and an understanding of the complexity of cooling and of EMC For...
    0 replies | 53 view(s)
  • dlyris's Avatar
    Yesterday, 09:00
    We are currently looking for a Senior Base Station System Architect to Engineering centre (MPE) in Kista to take a lead in the architectural design of future products. The work will include requirement capture, logical architecture design, etc. However the focus for this position will be on physical architecture and concept creation. The work will be done in close cooperation with our system teams at head office in China. (MPE = mechanical, power and Environmental (thermal) engineering) Qualifications You have at least 5 years of experience within system/architecture design (R&D) of Telecom radio products. You have previous experience from system design and related process steps from requirement capture to conceptual design and also within possible site configurations. General knowledge of the RF area is mandatory. For this position we also value experiences of the “platform, concept & product portfolio” discussions that take place during the initial phases of a...
    0 replies | 41 view(s)
  • K. Ouajjani's Avatar
    Yesterday, 09:00
    Designing in the mechanical engineering field has gone through many phases. In the ‘80s, a designer was different from an engineer, who was different from a design engineer. Nowadays, a single mechanical design engineer is responsible for all three job descriptions. You might be tempted to ask, what exactly is a mechanical design engineer? Instead of simply giving you a definition, we chose to define this profession according to the latest job postings from some leading companies in mechanics technology. These are the five most important skills that every mechanical design engineer should have: 1) Project Management A mechanical design engineer should be able to develop a project from concept definition to production detail design. He/she will ensure design solutions meet the mechanical system’s requirements as well as applicable regulations and best industry practices. He should also be familiar with the associated manufacturing processes, assembly techniques and drafting...
    1 replies | 138 view(s)
  • Paul T's Avatar
    Yesterday, 01:34
    Here is a little something of Kanarev's work. Here is a little better breakdown. I a told by one of my fellow R&D guys that Kanarev is using custom electronic clutches from 135 degrees to 180 degrees to overcome any negative torque and reach these crazy efficiencies.
    274 replies | 24931 view(s)
  • maniacal_engineer's Avatar
    23rd Apr '14, 22:52
    rubber plaster molding is a very good way. The alloys used for casting are closer to die cast alloys than the alloys you would use for a machined version. Rubber plaster molding has very good surface finish and tolerances, not quite as good as die cast, so you might need to do threaded holes or whatever as second ops. I have used these guys before, and they did a good job http://castingsnet.com/d/page.php?id=1512
    12 replies | 4510 view(s)
  • Valmiki's Avatar
    23rd Apr '14, 22:04
    That concept had crossed my mind, but I couldn't think how linear it was. If you imagine I had a very big diameter mandrel, then the 8mm rod would spring bach to a straight rod, whereas with a very small diameter, the spring back will be very small, and when released, would end up almost hugging the mandrel, so the ratio is not linear, but I suppose within a limited range it could be approximated to linear. The problem is I can't think what would be a reasonable range that I could assume the ratio to be approximately linear. I hope you can see my point. Thanks for your input.
    10 replies | 1170 view(s)
  • K. Ouajjani's Avatar
    23rd Apr '14, 21:47
    Thank you, Hillbilly! It's nice to get a concise clear insight on assembling options and methods.
    1 replies | 470 view(s)
  • maniacal_engineer's Avatar
    23rd Apr '14, 21:42
    "in theory there is no difference between theory and practice, but in practice there is" This is Erich's quote, I was quoting it back to him. Just to make sure that no one thinks I am claiming credit for something.
    274 replies | 24931 view(s)
  • Steve6br's Avatar
    23rd Apr '14, 20:12
    Gia I work with aluminium extrusions quite a lot and what you are after is used in the manufacture of aluminium glazed windows but I don't think this approach is common any more. I have seen it used with picture frames too... problem is that the extrusions are all different so you may not find a "standard" insert. Why not have a batch laser cut from 5mm sheet for your needs. The "teeth" need to go in the sides of the angle rather than on the face but should still work okay. They will need to be zinc plated or similar to prevent oxidation against the ali. Laser work is fairly cheap
    1 replies | 249 view(s)
  • MadLogger's Avatar
    23rd Apr '14, 18:23
    Valmiki, I am late to this post, but a simple ratio would get you the answer you need to within an acceptable tolerance. You may want to consider this if you find that you need another sized ring in the future. 48/30=34/x solves out to x=21.25. As long as you are working with similar materials, you should be able to expect proprotionally similar results.
    10 replies | 1170 view(s)
  • K. Ouajjani's Avatar
    23rd Apr '14, 12:45
    In the mechanical engineering and design world, many things seem trickier to begin with than they actually are. Writing a formal specification is one of those things. Because of its perceived complexity, some people do away with it altogether and others write a quick one just for the sake of audits. Most don’t understand the important role the specification plays in the overall design process. In addition, there is confusion about how exactly a functional specification is written. A functional specification is a document that describes the critical requirements and features of a design project. Each functional requirement is defined quantitatively to avoid ambiguity, and is normally defined within a range of values which are considered acceptable. However, once general requirements are agreed upon with the client and the designers begin to work, the functional specification can sometimes stray from a neat, quantitative document. Problems can arise due to over-descriptiveness,...
    0 replies | 399 view(s)
  • K. Ouajjani's Avatar
    22nd Apr '14, 22:00
    Managing and maintaining technical files is a common problem within the engineering discipline. When it comes to design data, a huge and diverse body of iterated data is often too much to deal with through manual naming and file organization alone. A shared drive or a server along with a standard archiving method is the normal solution but it’s a risky one for the following reasons: 1) Such an approach might work for one design engineer, who can quickly and easily navigate his own file system, but most mechanical design engineers work in diverse teams with many specialties; they must coordinate with other design engineers working on CAD, CAE, thermal studies, etc., as well as clients, management, and more. 2) When mechanical design engineers need to find a project or a file that was archived some months ago, it can be difficult to locate the correct version quickly. In addition, they could end up dismissing valuable data that could have been reused or losing data due to...
    0 replies | 240 view(s)
  • sarathdas's Avatar
    22nd Apr '14, 14:00
    SARATH DAS K P Sisiram• P.O.Pachattiri •Tirur •Malappuram •Kerala-676105•India• Ph:91 9656046143• Email:sharathdas_777@yahoo.co.in Hello, Looking for a design based job if possible in automotive field. I am knowledgeable in modelling softwares such as SOLIDWORKS, Inventor, AutoCAD, and analysis softwares such as Ansys package 14.5-Fluent,A.P.D.L, D.M, workbench and meshing software Gambit 2.4.6. I am having B.Tech in Mechanical Engineering and M.Tech in Thermal Systems. EDUCATION M.Tech in Thermal Systems ; University of Calicut , June 2013
    0 replies | 90 view(s)
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