Recent content by jehan60188

  1. J

    How to find Tensile & compressive force

    an umbrella mechanism is basically a radially-symetric assembly of sub-mechanisms find the forces on one "leg" and go from there the analysis is well within the capabilities of a final-year undergrad. use your training in statics. it's basically a few bars, all pin joints, some...
  2. J

    Which path does this mechanism follow?

    i don't remember the name, i think kutzbach criteria assume rigid links, and pin joints DOF =3*(5-1)-2*6 = 0 it's not moving
  3. J

    Equipment Drawings and thickness of lines

    find (or write) a standard, and tell your suppliers to conform to it check out section 3.2 http://mscweb.gsfc.nasa.gov/543web/files/GSFC-X-673-64-1F.pdf
  4. J

    Career in aerospace engineering with a mechanical eng. background

    wow, an engineer that wants to go into aerospace, or maybe grad school? this has never happened before! =0P just teasing anyways, the problem with having so many options is that you might forget to actually choose one! I suggest thinking more about what you want to do in aerospace. Heck...
  5. J

    What can I do to prepare for engineering classes and a career?

    start right now! I was 26 when I went back to school for a second bachelor's in engineering, and my mathematics background helped immensely. sign up for night classes at a community college- get your math (through calc II), and physics (through E&M) out of the way. Take the time to learn...
  6. J

    How hard is it to study mechanical engineering

    if you aren't good at math, consider going to the tech side of things. it's less theoretical, so you need less math
  7. J

    How do you usually approach a problem?

    tagging this topic to read later
  8. J

    Computer vs Mechatronic Engineering

    I've used advanced data analysis tools to help highlight the important portions of your statement. This should help you reach your own decision rather easily
  9. J

    Fire dynamics simulator, making obstructions

    also, can i insert a pot (or some general object that absorbs heat?)
  10. J

    Fire dynamics simulator, making obstructions

    hey all, Is there any easy way to make obstructions in FDS that aren't rectangular? I basically want to tack on a circular chimney to the following the chimney would be circular, and inscribed in the square. then, there'd be a circle inside of it, making the chimney have 10" thick walls...
  11. J

    Several questions involving a homemade miniature jet engine.

    5-minute jet engine anything beyond this is a matter of ingenuity, creativity, and tinkering (aka, engineering) www.youtube.com/watch?v=nZskLP8Q7AY
  12. J

    Finding a Dynamics Book with Derivation for Angular Acceleration

    in an undergrad introductory dynamics class, my professor used tensors, and assumed things went to zero to derive equations for angular acceleration. he then proceeded to show how a rotating body with certain moments of inertia will experience unstable rotation about certain axes due to the...
  13. J

    Fabricating bipedal-ish walker legs,

    Well, I totally redesigned the mechanism. It is inelegant, and boring, but it works. The only problem is that this project includes a report, which I've done in great depth for the other mechanism. This current mechanism does not lend itself to a good report (one that can demonstrate my...
  14. J

    Build a Simple Gear at Home | DIY Gear Tutorial

    rapid prototyping machine?
  15. J

    Fabricating bipedal-ish walker legs,

    so, I have to make a single-actuator walker for a class. it has to have two (unpowered) wheels, and two legs (it's a mechanism design class) here's the motor i have to use: http://www.pololu.com/catalog/product/71 i've drafted out a klann mechanism, and even made an assembly in...
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