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  1. tigermoth

    Fatigue endurance limit for standard fasteners

    Having calculated the actual cyclic load range the bolt is undergoing (using one of the above methods), you can refer to BS7608 (Fatigue of welded structures) for experimentally-derived S-N curves for typical bolt threads so you can calculate a safe life or allowable stress range. Bolt threads...
  2. tigermoth

    ISO Corner Castings

    There are ISO standards covering the performance and dimensions of these castings, but I'm not sure they specify a material although it obviously has to be weldable. I assume the walls of the containers are generally Corten, since there are often labels on the container instructing repairers to...
  3. tigermoth

    Allowable Bearing stress - High tensile pin

    Tmoose Yes, wear rate would be a factor as its in a component which you wouldn't want to replace frequently. Also avoiding seizing if lubrication is non-optimal.
  4. tigermoth

    EPDM vs Autodesk Vault Manufacturing

    Thanks all. We have a nice solid Novell netware network and are reluctant to depart from it, but sounds like we'll have to in order to use either PDM (EPDM or Vault). ctopher - did Vault talk nicely to Solidworks in actual practice? fcsuper & AnnaWood - Yes I was aware of the Conisio origins of...
  5. tigermoth

    EPDM vs Autodesk Vault Manufacturing

    Anyone got any comments on the user-friendliness of PDM Enterprise vs Autodesk Vault Professional in a mixed Solidworks/AutoCad drawing office? Anyone tried to use either on a Novell Netware network?
  6. tigermoth

    Allowable Bearing stress - High tensile pin

    Hi Any ideas on where to find allowable bearing stress for a greased 4340 (high-tensile) pin in a 4340 bush. Pin rotates under load. We would normally use 80-100 Mpa allowable for mild steel components but are there any published allowables for higher tensile components. Thanks
  7. tigermoth

    Part configurations

    I gather you Inventor guys handle configurations as separate iparts, iassy's etc to allow families of parts and tabulated drawings. How do you handle say an FEA configuration of an assembly? A sheetmetal configuration?
  8. tigermoth

    PDM Enterprise vs Autodesk Vault

    Anyone got any comments on the user-friendliness of PDM Enterprise vs Autodesk Vault Professional in a mixed Solidworks/AutoCad drawing office? Anyone tried to use either on a Novell Netware network?
  9. tigermoth

    Solidworks 2010 drawing capability

    Yes I thought things used to be a little easier. I agree cropping does seem to be best avoided (a resource hungry process). Would be nice to be able to optionally see all the view borders without having to click - maybe show them in some semi-transparent pastel shade! However my AutoCad ancestry...
  10. tigermoth

    Solidworks 2010 drawing capability

    Thanks all. Will attempt to put the case for some training in this area. One issue I have with drawing views is that we often use a driving part containing the underlying layout sketch of a vehicle. This part is inserted in each subassembly to 'infect' it with the 'DNA' of the design. Thus each...
  11. tigermoth

    Solidworks 2010 drawing capability

    Hi In the past (up to SW2008)I have really struggled with the Solidworks drawing interface to produce decent drawings quickly. Everything seems to be so non-intuitive and Microsofty. Just selecting and manipulating the view, annotation, part or underlying sketch you want is a mission, let alone...
  12. tigermoth

    Data management in an badly-organised company.

    Dave, I'm in a similar situation working for a heavy trailer manufacturer. We have a project folder for each vehicle or vehicle combination we build. Into the folder goes as complete a historical record as possible of everything to do with that vehicle ie photos, PDFs of calcs, drawings...
  13. tigermoth

    Loads for Trailer Design

    Very interesting paper. A vertical static load factor of 2.7 does seem high. Not clear from the paper what their "allowable" stresses are - looks like 300-350MPa for steel which has 645 MPa yield - ie allowable = 0.55 x yield, giving a total safety factor on yield of 4.9 for this load case...
  14. tigermoth

    Loads for Trailer Design

    DHKpeWI - For these static loads, I assume you would let the stresses go up to the allowables stated in general structural design codes eg roughly 2/3 yield for bending (tension side). Do I understand you to say that the max static download on the chassis would be 2.7g? Seems high - we generally...
  15. tigermoth

    Lifting chain hooks

    Thanks boo1 - yes I can appreciate it is important to have the component give sufficient sign of failure before rupture. Also relates I suppose to strain energy/work done & fracture toughness - we have done Charpy impact tests on the bar stock in each direction although not at this stage on...
  16. tigermoth

    Forging vs Rolled Steel

    Is there a quantitative way of predicting that forging is necessary (over machining from stock steel bar)in any given new design? Or is it always a judgement thing, based on superior (but not quantifiable) mechanical properties that can be obtained, plus a history of failures in similar...
  17. tigermoth

    Forging vs Rolled Steel

    rmw - totally agree. Most disconnect incidents I have heard of result from a failure to engage properly in the first place due to the factors we've mentioned. (I've never actually come across a broken kingpin). The semi is often left behind at the first set of lights. There are quite a few of...
  18. tigermoth

    Forging vs Rolled Steel

    I'm probably thinking of a different style of pin, one with a bolted flange mounting. Axial loads (though probably not critical in the design)could arise if 1. If the trailer has a high C of G and is undergoing sufficient lateral acceleration during cornering to try to overturn; this is...
  19. tigermoth

    Forging vs Rolled Steel

    I'm pretty sure heavy trailer kingpins experience significant bending and sometimes axial tension also. They are also usually stepped, depending on the type.
  20. tigermoth

    Lifting chain hooks

    EngineerTex - thanks for sharing your experience - very interesting!. My 'lug ' terminology is perhaps a bit vague - it is more of a chunky L-shaped hook with various protrusions and incorporates a clevis at the top for permanent pinning to the lifting chain (To which your points 1, 2 & 3 are...

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