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  1. EcoMan

    Tolerance for weldment's angular dimension

    Thanks, CheckerHater. My shorter leg is on a datum, so I'll base the tolerance on my longer leg.
  2. EcoMan

    Tolerance for weldment's angular dimension

    Hello, Why does ISO 13920 say that the length of the shorter leg determines the applicable tolerance for the angular dimension of a weldment? Wouldn't the deviation be dependent on the longer leg?
  3. EcoMan

    In-process and final inspections of which dimensions

    Can't a dimension be critical but, for example, the tool to machine its feature not be subject to excessive wear, thus requiring FI but not IPI?
  4. EcoMan

    In-process and final inspections of which dimensions

    Hello, I am an engineer but not in Manufacturing or Quality. The company that I'm working for does first article inspection (FAI), in-process inspection (IPI), and final inspection (FI) on any part manufactured in house. My understanding is that the company's FAI looks at all dimensions on...
  5. EcoMan

    Two-cavity mold t-test

    Just to clarify, I'm interested in whether the parts are affected by which cavity that they come from. Assume balanced mold filling.
  6. EcoMan

    Two-cavity mold t-test

    Hello, I would like to test for a difference between a single lot of injection molded parts from each cavity of a symmetric two-cavity mold. I'm not sure whether to use a two-sample t-test or a paired t-test. Which test is appropriate for this case? I assume that the answer doesn't change if...
  7. EcoMan

    Lung modeling

    Hello, Left and right lungs are pneumatically in parallel. The compliances of springs in parallel add as reciprocals, so why do lung compliances add directly?
  8. EcoMan

    L x W x H units

    Thanks, MintJulep, for your reasoning! That is a convincing argument for A being the only correct option. I see an Engineering Language/Grammar Skills forum where I suppose that I should've posted my original question.
  9. EcoMan

    L x W x H units

    Not to get too philosophical, powerhound, but something can be clear yet incorrect. For example, Clear and correct: (2 / 1) + 1 = 3 Clear and incorrect: (2 / 1) + 1 = 1 Unclear and correct: 2 / 1 + 1 = 3 Unclear and incorrect: 2 / 1 + 1 = 1 Everyone, let's forget about drawings and pretend...
  10. EcoMan

    L x W x H units

    Thanks all for the feedback so far. My question is general, not just for drawings. Goober Dave, I don't see anything in the IEEE Editorial Style Manual (www.ieee.org/documents/stylemanual.pdf) that addresses this. Besides which option is clear, I'm wondering which is correct. I don't think B...
  11. EcoMan

    L x W x H units

    This seems like the most logical forum to post this question. For a cube that measures 2 inches on each side, which one of the following is what you would write, assuming 8 in^3 isn't an option? A. 2 in x 2 in x 2 in B. 2 x 2 x 2 in C. 2 x 2 x 2 in^3 D. (2 x 2 x 2) in^3
  12. EcoMan

    Torsional stiffness

    You're right. I shouldn't have used the same variable (K) to denote both the polar moment of inertia and the torsional constant unless the cross section is circular. They are different for, as an example, an elliptical cross section. Consequently, twist of noncircular sections is not related...
  13. EcoMan

    Torsional stiffness

    I'm sure. Roark (1954) says the same thing.
  14. EcoMan

    Torsional stiffness

    Hello, The chapter on torsion in my Advanced Mechanics of Materials textbook from university says that, for a solid section with a given cross-sectional area A, stiffness is greatest when the centroidal polar moment of inertia K is least. What confuses me is that twist (= TL / GK) is inversely...
  15. EcoMan

    Combining noises

    Thank you all. The book doesn't talk about coherence, frequency, or phase--just identical machines in a theoretically free field. hydtools, that's a good link. It shows that SPLs, not ony PWLs, can be combined and gives the formula (but not one for adding unequal SPLs).
  16. EcoMan

    Combining noises

    An old textbook of mine says to use the power, not pressure, formula when combining noises but later that ten identical sound sources have an SPL 10 dB louder than just one source. Shouldn't it read PWL (power level of the noise), not SPL (sound pressure level)?
  17. EcoMan

    large rotation of hinged rigid beam

    The approximation sin(phi_0) = phi_0 reaches just 1% error at ~14 deg (http://hyperphysics.phy-astr.gsu.edu/HBASE/trgser.html)...
  18. EcoMan

    large rotation of hinged rigid beam

    Thanks, cbrn. The large deflection solution for cantilever beams (http://users.cybercity.dk/~bcc25154/Webpage/largedeflection.htm) differs from elementary theory when delta/L > ~0.3. For small delta, delta/L = sin(phi_0). sin(phi_0) = phi_0 for phi_0 < ~0.3 rad (~17.5 deg). Yes, this...
  19. EcoMan

    large rotation of hinged rigid beam

    Hello, My new workplace just has linear FEA software (for now), so can anyone help me out by running VM40 (www.kxcad.net/ansys/ANSYS/ansyshelp/Hlp_V_VM40.html) with and without NLGEOM,ON to determine the minimum rotation for which the nonlinear and linear solutions significantly differ? Thanks...
  20. EcoMan

    RFO-3 oil properties

    Hello, Does anyone know the viscosity and density of RFO-3 oil? http://answers.google.com/answers/threadview?id=504559 refers to the SAE J1260 standard.

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