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  1. Thread: Calculator Help

    by wsdave
    Replies
    37
    Views
    22,923

    "You need to understand the math and the physics...

    "You need to understand the math and the physics and the analysis behind anything you might be asked to defend in court."

    Which is why I've been specifically requesting help understanding the...
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    23,858

    I hate to go against Dave's advice, but Kelly's...

    I hate to go against Dave's advice, but Kelly's right: Pressure washers ARE a bad idea on paint, for the very reasons stated. That said, if your paint job is more than about 4 years old (regardless...
  3. Thread: Calculator Help

    by wsdave
    Replies
    37
    Views
    22,923

    "Did you make static diagrams? Do you know the...

    "Did you make static diagrams? Do you know the moments involved? Do you know how they create stresses in the beam materials?"

    I did not, but the physicist did. He said that he has a number of...
  4. Thread: Calculator Help

    by wsdave
    Replies
    37
    Views
    22,923

    Well, rescuing little Timmy from the well didn't...

    Well, rescuing little Timmy from the well didn't seem to phase you, so I can only assume this has something to do with Christmas, rather than simply suspending a person.

    If that's not the case,...
  5. Thread: Trailer Trashed

    by wsdave
    Replies
    7
    Views
    3,440

    Unfortunately, I can't buy a 10" drop axle....

    Unfortunately, I can't buy a 10" drop axle. Believe me that I would if I could. The largest anyone makes is a 4", because that is the "standard" for a 12" rim (a standard trailer rim). I could have...
  6. Thread: Trailer Trashed

    by wsdave
    Replies
    7
    Views
    3,440

    Thanks: That matches the answer the 1st year gave...

    Thanks: That matches the answer the 1st year gave me last night.

    As for spending time trying understand this stuff, I actually do: Unfortunately, only 1st year physics students seem to being...
  7. Thread: Trailer Trashed

    by wsdave
    Replies
    7
    Views
    3,440

    "You either need an engineer or a 4 year course...

    "You either need an engineer or a 4 year course in engineering."

    Actually, considering that my question was specifically about the output of the calculator, it turns out that I needed a 1st year...
  8. Replies
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    8,267

    Well, as a mechanic, we try to keep the grit OUT...

    Well, as a mechanic, we try to keep the grit OUT of the engine. That's one of the reasons why changing the oil and filters regularly is kinda important, and why driving in the desert is a little...
  9. Thread: Calculator Help

    by wsdave
    Replies
    37
    Views
    22,923

    No, but this is only the first build: Version 2.0...

    No, but this is only the first build: Version 2.0 will actually integrate a 7" touch screen at the rear that will not only have Satellite Radio and GPS, but also online vehicle repair manuals,...
  10. Thread: Trailer Trashed

    by wsdave
    Replies
    7
    Views
    3,440

    Trailer Trashed

    In addition to the multi-purpose crane in my other thread, I'm building a trailer.

    I know how much I'd like it carry, but don't have a clue about the dynamic(?) weight loads (how much the weight...
  11. Replies
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    8,267

    As a mechanic, I run into the same problem. I've...

    As a mechanic, I run into the same problem. I've never found a chemical that does a satisfactory job of rust removal without additional elbow grease, so for my money, even if you could keep the foam...
  12. Thread: Calculator Help

    by wsdave
    Replies
    37
    Views
    22,923

    I'm not sure if the 144 is PSI: It's whatever...

    I'm not sure if the 144 is PSI: It's whatever units the calculator produces.

    The 20' of 3" x 1.5" x .188" was simply a proof, in that the 144 number seemed far too small, so I extended it out the...
  13. Thread: Calculator Help

    by wsdave
    Replies
    37
    Views
    22,923

    But JB, unlike you, actually went on to offer...

    But JB, unlike you, actually went on to offer some explanation when it was clear I didn't understand.

    Again, thanks for stopping by.
  14. Thread: Calculator Help

    by wsdave
    Replies
    37
    Views
    22,923

    I figure to start with baby steps, so I'll go...

    I figure to start with baby steps, so I'll go ahead do the calculations separately (I don't think I'm quite ready for anything involving "higher level" yet).

    With an MoI of 1.7, Load of 32.6#,...
  15. Thread: Calculator Help

    by wsdave
    Replies
    37
    Views
    22,923

    LOL! And the fact that I was talking about...

    LOL!

    And the fact that I was talking about "lever class", something a 40+ year engineer had never heard of, wasn't a clue of a misunderstanding?

    It may well be "VERY basic beam calculations" to...
  16. Thread: Calculator Help

    by wsdave
    Replies
    37
    Views
    22,923

    There has apparently been a pretty major...

    There has apparently been a pretty major misunderstanding here. Nobody ever said your knowledge didn't apply. I explained in post #1 what I want to build and the calculators I'm using to figure it...
  17. Thread: Calculator Help

    by wsdave
    Replies
    37
    Views
    22,923

    The visual of flipping the diagram upside down...

    The visual of flipping the diagram upside down makes much more sense, but wouldn't the "uniform load" version work better at determining the forces from the weight of the beam itself, then the "at...
  18. Thread: Calculator Help

    by wsdave
    Replies
    37
    Views
    22,923

    [QUOTE=Kelly Bramble;393] You are correct:...

    You are correct: With 3 tubes weighing anywhere from 32# to 125# each, being able to separate them for storage, handling, and transport is vital.

    My tube "slop" on the 12" overlap is .125" top to...
  19. Thread: Calculator Help

    by wsdave
    Replies
    37
    Views
    22,923

    My system will be 3 tubes long. The third tube...

    My system will be 3 tubes long. The third tube will be 72" long, 12" of which is overlap into the second tube. I choose this 12" length arbitrarily based on existing designs, so it is NOT critical....
  20. Thread: Calculator Help

    by wsdave
    Replies
    37
    Views
    22,923

    The closest thing I've found to date runs about...

    The closest thing I've found to date runs about $6,000 and isn't as long as I need. the advantage of my design is that it doesn't require any electricity or overhead structure to be able to lift...
  21. Thread: Calculator Help

    by wsdave
    Replies
    37
    Views
    22,923

    Well, I managed to get some time of a Physics...

    Well, I managed to get some time of a Physics instructor at my local community college, and he mentioned a number of components I hadn't thought of. I also heard back from a metal supplier about some...
  22. Thread: Calculator Help

    by wsdave
    Replies
    37
    Views
    22,923

    Honest mistake, though. As an engineer, "crane"...

    Honest mistake, though. As an engineer, "crane" probably has a specific meaning to you. I'm NOT an engineer. Heck, I've never even ridden a train, much less driven one...

    Seriously though: As an...
  23. Thread: Calculator Help

    by wsdave
    Replies
    37
    Views
    22,923

    I didn't include the top strap, because I'm...

    I didn't include the top strap, because I'm hoping to not use one. My intention was to use thicker metal, of a larger diameter, and keep the top clear. I'll need that space to run a winch cable that...
  24. Thread: Calculator Help

    by wsdave
    Replies
    37
    Views
    22,923

    My tube info was actually based on the larger...

    My tube info was actually based on the larger tube, and while this specific crane I linked to happens to have a 21.5" max, I was looking for a more generic solution as to why the numbers don't work....
  25. Thread: Calculator Help

    by wsdave
    Replies
    37
    Views
    22,923

    You mention the counter-balance to the load...

    You mention the counter-balance to the load instead of fulcrum. That's brings up the vision of a see-saw, where more weight is applied to one side to offset the extra length of arm on the other side...
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