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  1. JCReynolds79

    Springs in Series Compression due to Acceleration

    Two springs in series w/different masses/rates. They are compressed some distance and "trapped" at this distance in a rigid frame. The springs' ends are attached to the inner walls of the frame. The frame is then accelerated in the axial direction of the springs. How do I calculate how much the...
  2. JCReynolds79

    Limiting Hole to Hole Size Variation

    Hi all, Numbers of holes , equally spaced on a PCD. The size of the holes can be quite loose, say, +/- 0.2mm. But what I am trying to think of is a way to control the variation of hole sizes. In sentence speak, Holes can be +/-0.2 but each hole must be within 0.05 of each other. e.g. dia 10...
  3. JCReynolds79

    Change Default Lights - NOT Locked to Model

    The first thing I do on every new model is to edit the light settings to toggle OFF the "lock to model" option. To me, this is absurd. Why would I want the lights in the room to move with the model? This means that the "dark side" is always the dark side. Just seems utter nonsense to me...
  4. JCReynolds79

    Press / Interference Fit - Calculate Change in Outer Diameter of Outer Member

    With regards to a press/interference fit of cylinders, I have lots of information on how to calculate the change in inner member OD/Id and outer member ID, the interface pressure/stresses etc, but one thing I seem to be missing (unless I can't see the wood for trees) is how to calculate the...
  5. JCReynolds79

    MACRO Scripting Get BillOfMaterial from Currently Selected Product Node in Tree

    Hi Folks, I am pulling my hair out a bit. I want to extract a BOM for a product in a lower portion of the main Product. i.e. a sub-assembly. Product Tree e.g.: Product (this is the Window's top level product) -> Product 1 - -> Product 2 - - -> Product 3 - - - -> Product 4 I created a macro...
  6. JCReynolds79

    Slack Tolerance of Size of Feature in Pattern But Variation Must be Tighter

    Basically, I am trying to think of a way to dimension a pattern of holes where the size of the hole isn't too important, BUT the variation of the size of the holes IS important. e.g. array of holes: 8X dia10 +/-0.5 (quite a slack tolerance as the size is not too important) but whatever size the...
  7. JCReynolds79

    Using Swept Volume to Simulate Gear Hobbing

    Hi all, I am wondering if it is possible to make use of DMU Kinematics and Swept Volume (or something else) to simulate gear hobbing to model accurate gears. I know I can model gears in other ways, but I want to know if it is possible this way. In theory, if I can sweep the "Rack" correctly...
  8. JCReynolds79

    Why Did Ford Decide to do a Flat-Plane Crank Differently?

    Most V8 engine layouts are Cross-Plane (sometimes called Cruciform) due to the 4 common crank pins being positioned in two planes, 90 degrees apart. Usually the two end pins are in one plane, 180 degrees apart and the two inner pins are on a plane perpendicular to the outer’s. Figure 1 shows a...
  9. JCReynolds79

    Suitable Stainless Steel for Jig Fixture Without Heat Treatment

    Hi All, Sorry but this is a request for suggestions as my knowledge of various stainless grades is not great. We are designing a jig for inspection. Part of this jig is a fixture, used to calbrate the jig. This fixture is basically 3 plates, bolted/dowelled together (to form a book-end shape...
  10. JCReynolds79

    Tool Steel Selection

    Hi All, I am after a bit of advice please. I am designing a simple tool for inspection purposes. It is basically a hollow cylinder (approx. 40mm OD, 30mm ID, 50mm long) with a mating "plunger" that will slide in the middle of it (30mm OD, 50mm long). I want the tool to be fairly hard wearing...
  11. JCReynolds79

    Drafting Pipes/Tubes

    Ergh... Its not pretty. I 'think' I have access to tubing/piping lisence, but have no idea how to use it (This is in V6). So I have created my tube with multiple bends by simply creating points, drawing 3D lines between them, then using the 3D corner tool. Then I just sweep a circle along it...
  12. JCReynolds79

    CATIA Equivalent to Seed and Boundary Select?

    Hi, Does CATIA have the ability to select geometry in the same way that CREO/Pro-E can with their Seed and Boundary function? Case: Engine block, want to select all the internals of the coolant jacket. In CREO one can select a surface on the jacket (e.g. inside somewhere) then select all the...
  13. JCReynolds79

    Torque Transmission Through Friction Coupling Assisted with Retaining Compound

    Hi all, I have a tube, which has a bolt down the middle, which when tightened, pulls the end face of the tube against another face. This tube then has to transmit torque, via friction alone. I can workout the possible torque transmitted by firction, but what I am trying to figure out whether...
  14. JCReynolds79

    Custom Made Spanner/Wrench Heat Treatment

    Hello all, I am tasked with creating the drawings for a set of special spanners, not something we can buy. We made one set before out of 304 stainless but after some use they started to deform. So I need to get more made and want to specify some more durable material probably with necessary...
  15. JCReynolds79

    Dynamic Mechanism Bearing Loads

    Hi folks, I am trying to work out how to get bearing reaction forces within a rotating assembly. Picture a simple shaft, with an eccentric mass towards one end (kinda 'L' shaped), then support it in 2 bearings at each end and rotate it. The eccentric mass is closer to one bearing than the...
  16. JCReynolds79

    Unable to Drag Datum Symbol Away from GTOL

    I have had this happen to me a few times and can never figure out why it is doing it or how to rectify it. I attach a GTOL to a surface, with a leader. I also have a datum plane running through that surface, on which I click>RMB>properties>Placement 'In Gtol'. It gets attached to the GTOL box...
  17. JCReynolds79

    Crank Mechanism Total Force

    Hi all, I want to simply determine total force on a very basic crank/piston assembly. I have set up a simple assembly where the crank is just some datum axes (crank axis and an offset pin axis), the rod is just two fixed points (centre of big end and pin) and the piston is a sphere of known...
  18. JCReynolds79

    Torque Just to hold Plug in Place

    Hi all, Hopefully a very simple question... I have a 'plug' made from steel, M22 X 2 thread, which is going into a cast aluminium threaded hole. It is acting purely as a plug, i.e. not clamping anything down. All I want to know is how to work out a sensible torque to do the plug up to so that...
  19. JCReynolds79

    Decimal Places of Individual Parameters

    Hello all, I use parameters from a distance analysis feature to populate tables in drawings for dynamic coordinates for pipes etc. Is there a way to control the number of decimal places that these parameters get displayed with in the table without reducing the overall 'default_dec_places' in...
  20. JCReynolds79

    Inertia Tensors in Crankshaft

    Hi all, I am getting a bit confused when trying to balance a crankshaft automatically in Pro/E. I know how I want to balance it, i.e. sum of all the mrx values for each 'slice' of the shaft in the vertical and horizontal planes should be zero. I have done this manually by interrogating each...

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