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  1. drawoh

    Fatigue Test of Metal Parts

    Are you testing your structure, or your material?
  2. drawoh

    Manager Says Keep the Restraints — I Think They’re Unnecessary. Who’s Right?

    Waross, Ass covering is what you do when the boss tells you you don't need the restraints. Unless you are working with the wrong kind of architects.
  3. drawoh

    QA/QC Process Structural Engineering Firm

    CWB1, Does PDM/PLM solve civil engineering issues? In manufacturing, we need strict change control, and we want to re-use as much stuff as possible. Just about everything in civil engineering is one-off, and failures are catastrophic. In manufacturing, you need an elaborate sign-off...
  4. drawoh

    QA/QC Process Structural Engineering Firm

    strguy11, As I see it, QA can do four things... Restrict tasks to qualified persons (QPs), like professional engineers. Define work methodology. This is how McDonald's gets burgers and french fries prepared by semi-literate teenagers. Provide official to-do lists and checklists. Identify...
  5. drawoh

    Saying Goodbye to Our Friend - Kelvin Lamport

    Yes. I am afraid so.
  6. drawoh

    Shaft can't fit in the hole.

    Have you measured the hole and compared them to your drawings? More to the point, have your looked up the ISO tolerances in your Machinery's Handbook to find out what they actually are, and then compared them with your measurements? Are your parts aluminium? Aluminium has a very high...
  7. drawoh

    Saying Goodbye to Our Friend - Kelvin Lamport

    https://www.eng-tips.com/members/corblimeylimey.204162/ :(
  8. drawoh

    Spring Modeling Help (Solidworks)

    SolidWorks supports flexible components. I have modelled a coil spring that fits between two flexible faces, although I have not done it for production. There was a fair big of jiggerypokey to achieve this, and I don't know how stable it all is on final models.
  9. drawoh

    Spring Modeling Help (Solidworks)

    Why? Helices are one of the worst things you can do to a large, complex CAD model. There is no need for a helical spring model unless you plan to 3D print it. Just do an array of circles (toruses?). Create a drawing showing the dimensions, the number of coils, and the spring rate...
  10. drawoh

    Stacking an object

    Arbitrarily select a force exerted at the top, or acceleration, which your stack must survive. Work out what it takes to knock your stack over.
  11. drawoh

    Parametric Spur-Gear CAD file?

    How will your gear be fabricated? For most gears, a machinist fabricates a blank, then they select an appropriate hobbing tool to cut the teeth. Your drawing calls up the number of teeth, the module for diametrical pitch and the pressure angle. Your CAD model only matters if you are 3D...
  12. drawoh

    T slotted (or otherwise) framing non-metallic

    You should start a separate thread for this question. Very few casters have metal wheels and tires. Are you asking about entirely non-metal casters? How strong must they be?
  13. drawoh

    composite tolerance at lmc : is it nonsense?

    I don't see the point of specifying any material conditions on tapped holes. Tapped holes centre their fasteners, and they are pretty accurate anyway. I used LMC on a casting I was designing. There were two holes in the casting that were to be accurately machined out. I was concerned that...
  14. drawoh

    Connector to casing assembly design

    Replace your connector with the bulkhead fitting. The bulkhead fitting will attach to your bulkhead and to your hose.
  15. drawoh

    Combating rebound of objects

    What sort of a student are you? We have a forum for students to post in. If two steel objects collide, the kinetic energy is converted hopefully to elastic deformation. The elastic deformation then converts back to kinetic energy. Any deformation other than elastic is what we engineering...
  16. drawoh

    Connector to casing assembly design

    AriRnD, What you need is called a bulkhead fitting. Your part is not properly retained in your hole. Is the flange connection supposed to be sealed? Forget it. A bulkhead fitting is retained into the panel by a nut, by screws, or by snapping in. Your hose is attached to a completely...
  17. drawoh

    Perpendicularity callout with curved datum

    bc23, Is this your drawing, or are you trying to interpret something somebody else has done? Your hole can be perpendicular to your datum in one axis only. Your curved face defines an axis, at least, geometrically. Have fun figuring out where this axis is in your inspection lab. If you...
  18. drawoh

    How to accurately and quickly convert inches to millimeters in technical drawings?

    If you redraw your part in 3D CAD, you can reproduce the drawing in inches, and quickly check it from the original drawing. If NX is anything like Solidworks, you just change the drawing units. The tolerances will convert. In Solid works, you must convert feature control frames manually. Can...
  19. drawoh

    Can I omit Basic dimensions?

    Ctopher, The STEP 242 models provide dimension information. What do the 3D PDFs do? If I have a drawing with dimensions, I can measure with scales, calipers, and micrometers. I can set up gauge blocks and dial indicators on the granite block, and I can design tooling and get someone to check...
  20. drawoh

    High-Temp Electromechanical Solenoid

    I designed a laser shutter that had a descending force spring. It took around a pound of force to start it opening, and then it dropped to a fraction of an ounce in the open position. I selected a motor to actuate it such that it required 10V to open, and 1V to hold open. Thus, I minimized...

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