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  • Users: Tunalover
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  1. Tunalover

    reference text recommendations for Creo Parametric 4.0

    Folks, Any recommendations on a Creo Parametric 4.0 reference book? I'm not looking for a step-by-step study guide...I'm looking for something like "The Creo Parametric 4.0 Bible". TIA Bruce ElectroMechanical Product Development (Electronics Packaging) UMD 1984 UCF 1993
  2. Tunalover

    How to calculate a time duration in hours and minutes given initial and final times

    Folks: I have a need to calculate an event durations in XX.XX hours given a start time YY:YY gm and end time ZZ.ZZ gm. For example, YY:YY gm could be 7:13 am and ZZ.ZZ gm could be 3:23 pm. Can anyone clue me in on how to do this in Excel? TIA Bruce ElectroMechanical Product Development...
  3. Tunalover

    Environmental IR Radiation Entering Ground Equipment

    Guys: For the IR heat absorbed from a terrestrial environment (but NOT including sunlight), how can I prove/show that the emittance and absorptance of a particular painted or unpainted metal surface are equal for that IR spectrum? I know it involves Kirchoff's Law but Kirchoff's Law is much...
  4. Tunalover

    Solution to the SDOF spring-mass-dashpot system subjected to a half-sine pulse

    thread384-436025 I found the closed-form solution thanks to Tom Irvine. Such a simple model does have practical value IMO in studying the vertical responses of shock-mounted equipment subjected to shock pulses like those in MIL-STD-810 simulating transit drop and other collisions. I worked on...
  5. Tunalover

    Drawing formats and block libraries for DraftSight and/or AutoCAD 2D.

    Folks, I downloaded the free DraftSight 2D CAD program but the Dessault Systems web page offers no free block libraries or drawing formats. Does anybody know where I can find some? If not for DraftSight, what about AutoCAD 2D? I'm thinking that, since DraftSight is an AutoCAD 2D clone, then it...
  6. Tunalover

    Working with EEs

    Guys, If you do electronics packaging design for a living, is your boss and ME or an EE? If EE, do you feel he/she is adequate for the role seeing how he/she is not an ME? What attitudes do you see among managers and EEs in your workplace about the work you do? ElectroMechanical Product...
  7. Tunalover

    Solving a non-linear equation a bunch of times

    Folks, I have a complicated nonlinear equation in one unknown that has a bunch of constants and coefficients I want to change to see what happens to the solution. So I'd like to set up perhaps a hundred or more iterations, each of which requires a solution of the nonlinear equation. Any...
  8. Tunalover

    Too many jobs?

    Folks, idealist that I am I have moved from one job to the next in my career trying to find an employer who not only cares about designing and delivering the products at hand but also cares to envision and implement an improvement program that will improve design engineering performance OVER THE...
  9. Tunalover

    Electrical component compact thermal models (CTMs)

    Does anyone know where to find a database that tells us what manufacturers and part numbers exist having CTMs rather than the conventional single-resistance junction representations? Is there an industry CTM standard saying how they are determined and presented? TIA ElectroMechanical Product...
  10. Tunalover

    SIM REQT with multiple composite tolerance FCFs in one view with multiple feature patterns

    Suppose we had a flat, rectangular plate of, say, aluminum. And say we had three datums A, B, and C as primary, secondary and tertiary datums assigned to the largest flat surface (A), the longest edge (B) and the shortest edge (C). Lets call out a 12-member pattern of simple holes at diameter...
  11. Tunalover

    "Law of Thermodynamics" from engineer pocket guide

    Folks, I have "The IDC Pocket Guide for Engineers" which seems to contain a lot of useful information. But looking it over I found an error in a temperature conversion formula [Tf=(5/9)(Tc+32)] and a "Law of Thermodynamics" as they call it: Cp/Cv=5/3 Has anyone else seen this "Law" before...
  12. Tunalover

    Wikipedia update on the term "electronic packaging"

    This is an FYI post. Folks I've been doing electronic packaging for longer than I care to admit, but in my career whenever I tell someone that I do "electronic packaging", unless they ask what it means or unless I volunteer what that means, most non-engineers walk away with the belief I work...
  13. Tunalover

    Techpub software. What's good for doing articles on GD&T?

    Folks, I am looking into publishing some articles on the proper use of GD&T and I've come to believe that others who have done the same have struggled with a tedious publishing process that means working with a 3D CAD program, an illustration program, and a word processor. One combination, for...
  14. Tunalover

    PTC standard parts library

    Folks, Maybe 15 years ago PTC made available a huge library of metric and imperial standard fasteners, electronic connectors, pipe fittings, UDFs (e.g. louvers),... These came in nested family tables. Are these still available free as they were then? Although it was a lot of work to provide...
  15. Tunalover

    A harmless looking SDOF vibration problem but...

    It took me a while to dig up the solution to this one. It's a fairly realistic SDOF dynamic model of a suspension system subjected to a half-sine pulse of duration T. Since I don't know how to get math into this little forum box, the problem is attached as a pdf. All those who believe they...
  16. Tunalover

    SolidWorks Flow Simulation module

    Folks: Is Subject software a Finite Element Method (FEM) solver or a Finite Volume Method (FVM) solver? Please cite your source of information. Thanks! H. Bruce Jackson ElectroMechanical Product Development UMD 1984 UCF 1993
  17. Tunalover

    JEDEC nine-resistor DELPHI component thermal models

    Anyone out there know what component manufacturers will provide the JEDEC nine-resistor DELPHI thermal models for their electrical components rather than just the rough two-resistance thermal models consisting of only ΘJCtop and ΘJB? H. Bruce Jackson ElectroMechanical Product Development UMD...
  18. Tunalover

    Wanted: EE guest authors and bloggers for Electronics Cooling Magazine

    As electronic products are becoming smaller, the circuit heat dissipations have not reduced accordingly. EEs are becoming more concerned with thermal management and MEs are becoming more concerned with heat dissipation. Now I've been an ME for a while doing electronic packaging and my...
  19. Tunalover

    Manufacturers' electrical component Boundary Condition Independent (BCI) thermal resistances

    Anyone out there know what component manufacturers provide the BCI resistance networks for their components rather than just the rough JEDEC Compact Thermal Model (CTM) two-resistance model consisting of only ΘJCtop and ΘJB? Also, I'm not really clear on how the BCIs are defined and determined...
  20. Tunalover

    ASME Y14.8-2009 Castings, Forgings, and Molded Parts

    Folks I'm trying to find where I can get an affordable copy, soft or hard. I'd appreciate it if any of you have a spare copy and would like to sell it for a reasonable price or can refer me somewhere where it won't cost upwards of $160 US! Thanks, Bruce H. Bruce Jackson ElectroMechanical...

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