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  • Users: flash3780
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  1. flash3780

    Projected Tolerance Zone with Slot Position

    Per the title: Is it legitimate to use a projected tolerance zone for the position of a slot, as you would with a hole. I think that it is legitimate based on my understanding of projected tolerance, but I've never come across it in the wild. ASME Y14.5-2009 Para 7.4.1 recommends use of...
  2. flash3780

    Applying Position Tolerance and/or Angularity to a Datum Plane

    Hello, Been a while since I posted here. I've got a situation where I need to apply a position tolerance to the centerplane of a dovetail slot. Since the dovetail slot is a complex shape and the functional part is tapered, I think that the centerplane of the slot is not entirely clear. So, I...
  3. flash3780

    What's the correct term to apply a control to a volumetric region of material?

    I'm faced with adding a specific material property control to a region of a forging. When working with machined parts, it's common to apply controls to "AREA"s (e.g. a length along a diameter requires a tighter tolerance or some special processing). However, I don't think that I've ever had to...
  4. flash3780

    APDL Helpful Tip: MD5 Checksum for Input File Validation

    Recently, I've been using Python to generate APDL run scripts for (somewhat complicated) mission analyses in ANSYS. File management can be difficult for such analyses, and it is helpful to be able to easily verify that a particular set of input files was run for a given set of outputs. To do...
  5. flash3780

    Tolerance of Form on a Width

    I know a width dimension has to have perfect form at maximum material condition per Rule #1, but if I need to apply a refinement to control the form of two faces defined by a width dimension, what's the best way to do that? I know that I could establish a datum from one of the faces and then...
  6. flash3780

    Expectation of Unvouchered Overtime

    I've worked at several companies in my career. The latest one outlined an expectation of at least 4-5 hrs/week of unvouchered overtime (beyond 40 hours). They call it "casual overtime". I understand that companies aren't required to pay engineers overtime, and that's fine... I just thought that...
  7. flash3780

    How to define a sheet metal ring? (Flat pattern? Free state? Restrained State?)

    Hello, I'm struggling with the best way to define a thin sheet metal part (.010" thk). My part is a fairly simple stamping which is rolled into a "C-shape". The stamping looks like a long-thin strip with some features... you could think of the part as a rolled up Chevrolet logo. The design...
  8. flash3780

    How to define a feature that isn't in the nominal profile

    I ran into an interesting scenario that I wasn't sure of the best way to handle. I'd like to define a feature that exists at MMC, but doesn't exist in the nominal profile of the part. The particular geometry that I'm looking at is a machined radius that breaks out of a cast surface. I'd like...
  9. flash3780

    Moment of Inertia Tensor - Parallel Axis Therom

    Good evening. I've been banging my head against the wall a bit trying to compute the moment of inertia of an assembly by hand. The reason for computing the MOI in this way is because the organics in some components (epoxy, potting, etc.) are not accounted for in our Solidworks model, so I've...
  10. flash3780

    Signed von Mises Stress vs Principal Stress Range for Fracture/Fatigue

    I'm working with one of our customers to determine the maximum allowable flaw size in our hardware during inspection to meet life requirements. FEA models (and hand calculations) produce complex stress states which must be boiled down to a stress range for fracture/fatigue calculations. I've...
  11. flash3780

    Non-Smooth Contours Along Symmetry Lines in Radiosity Cavities

    I'm wondering if anyone else has run into this sort of problem: I'm getting step changes in my contour plots along lines of symmetry in my radiation cavities. My model is 1/8 symmetry and I'm using RSYMM to reflect the geometry. I get step-changes in the my results along the lines of symmetry...
  12. flash3780

    Making Nice Plots in Octave/Matlab

    Hey everybody! I made a blog post describing how to make great plots in Octave and Matlab. Hope someone finds this helpful: http://engineeringliberty.wordpress.com/2011/10/07/making-great-plots-in-octave-and-matlab-too/ //signed// Christopher K. Hubley Mechanical Engineer Sunpower Incorporated...
  13. flash3780

    Anyone know how to change fonts in figures when using Octave?

    Ok... well I feel foolish. I didn't have Vera loaded on this machine. I tried Arial and it worked: title("Pressure Vessel Cylinder\nStress Distribution",'FontSize',8,'FontName','Arial') That said, I can't seem to figure out how to list what fonts are available. Any suggestions there? I tried...
  14. flash3780

    Strange Ansys Behavior. Suggestions?

    I'm having a bit-o-trouble with one of my 3D models and I was wondering if anyone on here might have some insight. I have a pretty large thermal model with quite a few types of boundary conditions. One of the boundaries is a volumetric heat generation (in some heater cartridges). If I apply 25%...
  15. flash3780

    General Electronics Design Reference Book?

    Hey folks. I was wondering if you guys might have some suggestions for a electronics design reference book. I'm thinking of something along the lines of Shigley's "Mechanical Engineering Design," but for electronics. A couple of my friends and I are looking at designing a better robotic...
  16. flash3780

    Radiation to Ambient

    I'd like to include radiation to ambient in my model. I've already got SURF152 elements on the exterior for convection, and I think that I can apply ambient radiation to those. However, when I try: NSEL,s,TYPE... blah blah blah SF,,RAD,0.15,29 ANSYS doesn't like it. I tried changing KEYOPT 9...
  17. flash3780

    Modern Applications of Hot Rivets

    Just a curiosity, really, but I was wondering if anyone knows of any modern applications for hot-driven rivets. I was trying to think of someplace where they're commonly used (or used at all) in modern designs... and I couldn't. They used to be used all of the time in ships and bridges, but...
  18. flash3780

    Dimension to Background Lines in a Section View

    Quick question: Does it violate standards to dimension to a background line in a section view? In my view, it's bad practice, but I'm not sure that it's explicitly disallowed by any standards. We do our drawings in accordance with ASME Y14.5-1994. Unfortunately, I don't have my copy with me at...
  19. flash3780

    The Story of Mel

    I came across this usenet post from the early 80s: a response to another article called Real Programmers Don't Use Pascal. It's called "The Story of Mel", and I thought I'd share. Apparently Mel was a real programmer at Royal McBee Computer Corp (pictures of some of his routines here). Although...
  20. flash3780

    Has anyone had experience with VariCAD?

    I was wondering if anyone has had any experience with VariCAD as a design tool. The cost is attractive and it works in Linux, which is nice. I'm wondering how well it handles more complicated tasks like layouts and assemblies. Can it generate parasolids or IGES files for analysis? I was looking...

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