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  1. JCReynolds79

    Springs in Series Compression due to Acceleration

    Hey btrueblood, thanks very much for the steer. Very useful info thanks. Regards, Jon Reynolds
  2. 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...
  3. 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...
  4. JCReynolds79

    Change Default Lights - NOT Locked to Model

    Ok thanks for the tips (handleman). SBaugh, I am too busy designing products to be so interested in watching all the online tutorials just to try and fix a mere annoyance. Hence why asking people that use the software for a quick tip...(you know, that thing forum's actually exist for). Thanks...
  5. 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...
  6. JCReynolds79

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

    OK, thanks all. Regards, Jon Reynolds
  7. JCReynolds79

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

    Been thinking more. I agree the difference is very negligible. GregLocock, my point is I can't just apply the normal pressure, as to calculate that normal pressure you need to start with a value for R (interference radius after fitting). So its a bit of chicken and egg situation. 3DDave, you...
  8. JCReynolds79

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

    Hmm still not happy about having a known size shaft and hole with known material properties we can't just simply calculate the resultant R before we calculate the pressures etc. I get that the sizes are so small its almost neglible but that#s not the point. I found a reference to Precision...
  9. JCReynolds79

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

    OK, so I found in Roark's the equations for this; as you both say, treat it as a pressure vessel. The thing that still bugs me, is that when you work out the initial interface pressure (p), you need to already know 'R' which is the interface radius. How do we know what R is to start with, as...
  10. 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...
  11. JCReynolds79

    MACRO Scripting Get BillOfMaterial from Currently Selected Product Node in Tree

    Hi Ferdo, We run LCA/VPM here, so I cannot open the sub-assy in its own window, only in context, so I have to be able to select/activate the lower child sub-assy in the tree. Thanks. Regards, Jon Reynolds
  12. 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...
  13. JCReynolds79

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

    Hi CheckerHater, Yes, holes are tied up pretty tight positional-wise. Cheers. Regards, Jon Reynolds
  14. JCReynolds79

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

    Hi Folks, Yes, sorry should have stated, it is ASME. So text note it is. pylfrm, many thanks for the suggestion. CheckerHater, the reasoning is because the holes are lightening holes in a circular pattern on a rotating part, so nothing fits in the holes (hence free size tolerance) but want...
  15. 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...
  16. 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...
  17. JCReynolds79

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

    Same magnitude secondary horizontal shaking forces exist in both FP set ups. So I don't think this is purely connected to engine size as they didn't solve that problem. Regards, Jon Reynolds
  18. JCReynolds79

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

    At last, some light shed on the exact issue I have been trying to explain/get to the bottom of: http://www.edmunds.com/ford/mustang/2015/long-term-road-test/2015-ford-mustang-gt-coyote-voodoo-cross-plane-flat-plane.html So...if I am reading into it right...its all about MARKETING! The sound it...
  19. JCReynolds79

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

    I am starting to suspect it was down to machining/production capabilities. Seems most plausible. Look at how many 90deg V6 engines are out there with the costly split-pin cranks just because of 90deg V8 production lines. Seems a shame...still a good discussion point. Regards, Jon Reynolds
  20. JCReynolds79

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

    IRStuff, I thought my OP highlighted what I saw as the disadvantages clearly enough. FP UDDU (typical) is statically and dynamically balanced, hence no additional CWs required either end like on a cross plane V8. Ford's UDUD FP reintroduces the dynamic imbalance similar to the cross plane...

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