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Type: Posts; User: daleacyr

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  1. Thanks Kelly. I've been wandering around the...

    Thanks Kelly.
    I've been wandering around the AISC for a day or so.

    Referring to the attached drawing:


    2343


    In a horizontal beam, the lines of force, compression and tension make sense...
  2. Rule of thumb for drilling holes in I beam flange

    I am aware that there are general rules of thumb regarding the size and placement of holes in beams.
    The question was presented to me today:

    Is there a general rule of thumb regarding size and...
  3. That picture looks like it came from Delbert...

    That picture looks like it came from Delbert Hall's book on rigging...
    He provides the answers to the homework questions in the back of the book.
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    Thanks for that. I used both equations, and got...

    Thanks for that.
    I used both equations, and got the same answer. (That's good!)
    But I seem to be having a bit of a 'senior moment'... indulge me if you will.
    The Maximum Tensile Stress is xxx...
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    What is the equation for....

    I'm back with another crazy, shop built project. :)

    Think of a HF hydraulic press.

    The columns have to resist a tension load.
    I'm building something similar, a device to proof test electric...
  6. Yes, that will at least help me understand the...

    Yes, that will at least help me understand the discussion. :)
  7. The most important effect is that the substance...

    The most important effect is that the substance be thoroughly mixed.
    The "substance" is unknown at this point, hence the question.

    I'm basically pondering how strong a propeller (impeller?) blade...
  8. How a propeller blade is resisted by various viscosity?

    I'm building propeller blades to blend various solutions.
    But I'm stuck: is there a formula to determine the resistance a specific viscosity will provide against a surface area?


    Meaning, if...
  9. Here is a picture of the completed project. I...

    Here is a picture of the completed project.
    I really appreciate you guys providing your thoughts / notes / conjecture / advice / comments.

    It turned out pretty well; the customer wants several...
  10. We built a table, and then performed a real world...

    We built a table, and then performed a real world deflection measurement.
    I was getting less and less comfortable with the potential deflection, so we up-sized the beams to .120.

    We got an actual...
  11. Ok, thanks. Simple beam calculations I...

    Ok, thanks.
    Simple beam calculations I understand very well.
    Structures.... less so.

    We are still going to build one and let two "big dogs" sit on it.
    And adjust to suit. :)
  12. If you will indulge me just a bit further......

    If you will indulge me just a bit further...
    I've been thinking about the fact that the center support is really just adding a third bending member.


    To calculate how much that third member adds...
  13. Good point. That's why I ask for input. :)

    Good point.
    That's why I ask for input. :)
  14. Well, we got approval (for aesthetics) regarding...

    Well, we got approval (for aesthetics) regarding the center support.
    With a 500 lb load at center, this reduces deflection to less than a tenth of an inch, providing my calculations are correct.
    ...
  15. Thanks for the input. I've run the various...

    Thanks for the input.
    I've run the various numbers; a center support fixes a lot of problems.
    I'll check with the committee for approval.
  16. Thanks! I had not thought of the assembly in that...

    Thanks! I had not thought of the assembly in that way.
    Now for a bit more number crunching...
  17. Thank you for your responses. I wish I could...

    Thank you for your responses.

    I wish I could develop a stress / strain curve for the complete assembly, but the only way that I know how to do that would be to actually stress the assembly and...
  18. Reasonable deflection for a metal and wood table

    I've been tasked with building a couple of tables for a church.
    The "customer" is requesting that the tables be made from 3" high x 1.5" wide by 14 ga. tube steel, with a wood plank top....
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