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  1. ddelaiarro

    Benefits of line drilling rivets

    I don't disagree with you, SWComposites. He thinks holes drilled separately will be "good enough" and not require the extra work and potential FOD on the floor. It's kind of ridiculous, and frankly, the arguments over dimensioning vs. strength are what's driving me toward this question. It's...
  2. ddelaiarro

    Benefits of line drilling rivets

    I guess what I'm looking for is an analysis of why those specs are the way they are. What's driving this is a Quality Manager who is more concerned about FOD on the floor from match drilling than proper assembly.
  3. ddelaiarro

    Benefits of line drilling rivets

    I've heard it called both. I think "line drilling" is used because it's a (production) line function. Match drilling more accurately describes the process, however. Back to the original question, though, does anyone have any technical articles on the topic? I understand the conceptual "why"...
  4. ddelaiarro

    Benefits of line drilling rivets

    Yes, in a semi-assembled state.
  5. ddelaiarro

    Benefits of line drilling rivets

    I've read in multiple locations that line drilling rivets is beneficial, but I've never seen a technical (comprehensive or otherwise) discussion of why. Does anyone have any links to resources that discuss the why behind this suggestion?
  6. ddelaiarro

    Imitating Solar Load in a Temperature Chamber

    After talking it over with some others here, we've decided on a simplified method with some known issues to at least somewhat simulate this test. Here's our solution and thought process: The convection heat transfer equation is as follows: P = k?Aconv??T where ?T = Tcase - Tamb, Aconv is the...
  7. ddelaiarro

    Imitating Solar Load in a Temperature Chamber

    Understood - that makes a lot of sense. The Mathcad files helped a little, but I still am not sure of what's going on here. I think your equation for hr is incorrect. If you look at ?Qir = Fr?hr??To ? sky and do a unit analysis, you get ?Qir = 1 (Fr is unitless) * {1 (emissivity is unitless)...
  8. ddelaiarro

    Imitating Solar Load in a Temperature Chamber

    The Wikipedia article on Tsol states that: I know the following variables: Tamb - The chamber temperature. This is a known/given variable that changes over time. A - The exposed area of the module. This variable is known and constant. I - The solar irradiance. This is a known/given variable...
  9. ddelaiarro

    Imitating Solar Load in a Temperature Chamber

    First off, thanks a ton for the insight. It's really helping. The research I've been doing on view factors seem to be for radiation from one body to another and don't seem to be relevant to an object and the sun. Any suggestions on resources (online, preferably) to acquire the appropriate...
  10. ddelaiarro

    Imitating Solar Load in a Temperature Chamber

    Twocallcane - Absolutely is (DTB is on our list of potential test houses) and we will be performing the test at a similar location. We are trying "pre-wire" the test so that we have a level of confidence with our ability to pass the test on the first shot which would A) give the customer...
  11. ddelaiarro

    Imitating Solar Load in a Temperature Chamber

    MintJulep[\b] - Thanks for the additional resource. I think I'll be able to use that and derive the information I need. [b]IRstuff - Interesting question. We're a pretty small outfit with a small systems engineering group (1-2 people). It seems that our systems group and what you're...
  12. ddelaiarro

    Imitating Solar Load in a Temperature Chamber

    MintJulep - thanks for the link. I'm pretty sure I can come up with the convection coefficient (h) and the heat Transfer (Q) would be the Power Dissipated inside the box plus the Power Load due to solar effect (W/m2) times the area (A). The Outer Surface Temperature (Ts) value is where I'm...
  13. ddelaiarro

    Imitating Solar Load in a Temperature Chamber

    BLUF: Is it possible to mimic a solar loading environment solely in a temperature chamber and, if so, how? We have an 6061 Aluminum box with a known heat load inside. It needs to be subjected to a solar load IAW MIL-STD-810G, Method 505.4, Proc I. Essentially, it is a 24-hour exposure cycle...
  14. ddelaiarro

    Design & Drafting Check Procedure

    I absolutely believe that, if a drawing is touched and changed in any manner, an ECN is required. I've worked for companies that have been burnt in the past on this issue and will not have it happen to us.
  15. ddelaiarro

    Design & Drafting Check Procedure

    Thanks to everyone for the replies. I suppose some clarification on my part is in order: 1. I probably misrepresented myself when I included the word design in my initial post. I am simply trying to check drawings for completeness and clarity. We are using design review to confirm the...
  16. ddelaiarro

    Design & Drafting Check Procedure

    Hi all - Bottom Line Up Front: I want to develop a design and drafting check procedure. I manage a small engineering team that designs electronic modules for the communication industry. We have been spending a lot of money on ECNs lately. It seems that the root cause is drawing errors. Our...
  17. ddelaiarro

    Vibration Testing to Mil-Spec

    I've been trying to figure this out for a week or so and haven't come up with a confident answer, despite my research. We're trying to come up with the proper profile for our vibration testing and seem to have run into a roadblock. While I can't be that specific, we need to test 'installed'...
  18. ddelaiarro

    Key/Keyway for Torque Transmission

    handleman, I work the latter. We are a company that specializes in ion beam etch equipment for the data storage and semiconductor industry. All our products involve UHV.
  19. ddelaiarro

    Key/Keyway for Torque Transmission

    I overlook a simple solution. Why not use a square shaft with a square linear bearing press fit (possibly with set-screws to prevent rotation) into the seal. The gear is bolted onto the rotary part of the seal, thus transferring the torque from the gear to the shaft. Pretty simple, right?
  20. ddelaiarro

    Key/Keyway for Torque Transmission

    Mike - Thanks for the response. Unfortunately, that idea won't work for two reasons: A) this needs to be a production design and B)I can't make the overall diameter of the shaft bigger than 2" due to some other design constraints. All of these ideas are great though. It gives me different...

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