Recent content by john.phillip

  1. J

    Admissions Graduate school admission chances

    When I was 15, I was hired to help with the installation of new computers and the network in the virology department in the early 90's, and provide basic training on the operating system and software. After I was done, they invited me to work with the researchers in the virology lab. They needed...
  2. J

    How to seat a motor shaft B taper connector correctly?

    What's your application? For applications that use axial compression, such as for drilling machines or lathes, the initial axial force for assembly is not too important as the more you press the tool against the part, the more torque you are able to naturally transmit. With those machines, I...
  3. J

    Advice for learning enough Solidworks to pass the CSWA and CSWP exams

    I've learned it entirely by myself, as back in the days there were no tutorials and it was one of the main philosophies of the engineering course: "learning to learn"; and many of my friends in the Mechanical Engineering course did it as well. I was given SolidWorks 98 when it first came out...
  4. J

    B (ELI5) why can’t massless particles travel infinitely fast?

    I like Dale's answer and there's a video that touches the core of the issue (with a hat trick) and hopefully does not deviate too much from the ELI5 requirement:
  5. J

    B What does relativity say about wormholes?

    The stability problem is only applicable to static wormholes. Rotating wormholes are self-stable and do not require any sort of magic to keep the throat open.
  6. J

    How can mass be measured independently of gravity?

    As far as I know, [kgm] is an old days way of writing [kg], because [lbf] (pound-force) can be confused with [lbm] (pound-mass) if one writes just [lb], due to the way "weight" and "mass" are mixed up in the English language. So scales would be marked with [lbm] to indicate it's already...
  7. J

    Maximum bending moment and maximum deflection of the spring?

    It looks like you saw the units [N.m] or [lbf.ft] somewhere and thought it was bending moment, but springs are usually loaded in pure torsion, which uses the same units, but the meaning is completely different.
  8. J

    Engineering Need Advice on Fundamentals of Fluid Mechanics Textbook

    I learned on Fox and McDonald's Introduction to Fluid Mechanics (~900 pages), there are a few solution manuals available online for you to knock yourself out (1,400 to 2,200 pages of resolved problems).
  9. J

    Questions About Interference Fits

    Many thanks, that's accurate enough but special attention to the following technical term in the foreign language "Qualidade IT" must be noted, as it's the main keyword in the subject and it refers to the relationship between tolerancing, assembly/maintenance difficulty, quality of fit and...
  10. J

    Questions About Interference Fits

    I want my comment back, so I can translate it to English for everyone's benefit.
  11. J

    Force required to drive the Trommel

    There are different designs for trommels, you definitely need to provide a sketch of your particular arrangement. For instance, there are trommels that just sit on tires or rollers, whilst others have a shaft running through the middle, with an electric motor in one end and several bearings...
  12. J

    Why Do Polymer Linear Bearings Have Grooves?

    The post above contains the webinar I watched.
  13. J

    Why Do Polymer Linear Bearings Have Grooves?

    I watched one ~50min long Igus webinar and downloaded their drylin linear bearings catalogue. My findings are the following: a) They state in the video that heat is mostly transferred through contact (shaft and housing); b) They offer +150 materials for non-metallic bearings and they tweak the...
  14. J

    Why Do Polymer Linear Bearings Have Grooves?

    You might find this video useful:
  15. J

    What is the most straightforward way to perform a CFD analysis on a starfish?

    Even if you are only interested in a comparison between two competing designs, I strongly recommend you to go for a full scale test, specially because it is possible to do. This will give much more substance to your research and will probably save you time and criticism.
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