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  1. rorschach

    Farm implement threads

    Gary, Thank You! That was exactly the site I was looking for.
  2. rorschach

    Farm implement threads

    Let me be perfectly clear, I do not know it to be a stub acme thread. It may very well be something completely different. I am told they bought it from their local John Deere dealer. I have never heard of a "farm implement thread" standard, nor has anyone else I work with.
  3. rorschach

    Farm implement threads

    I hope someone can help me. My team is investigating a field failure where the field crew bought a piece of all-thread and nuts that they claim is threaded with what they called a farm implement thread and then used it for something completely different than it's intended purpose. I have not put...
  4. rorschach

    High Expansion Coefficient Steels

    Must it be steel? What about Aluminum?
  5. rorschach

    A514 (T1) Galvanizing / Embrittlement?

    as long as it is hot dip and not electro-galvanized embrittlement should not be an issue, loss of properties due to tempering as mentioned perviously might be however.
  6. rorschach

    Big Dig Failed Bolt Joint Details

    there is a huge thread over in the structural forum on this. Hilti is making the replacement equipment. Power Fasteners supplied the original epoxy acrylate (vinyl ester) anchor material that failed. Epoxybot has the skinny on the chemistry and why it was not appropriate...
  7. rorschach

    4140-4142 Annealed or Heat Treated?

    I would not use a resulphurized steel (1144) in a application where it could see cyclic loading. Free machining steels of this sort have terrible fatigue properties.
  8. rorschach

    Big Dig Boston ceiling collapse

    After reading all of this I'd venture to guess that everyone looking at it assumed someone else had verified things. This is the way of group projects, nobody takes ownership. The PE probably based his approval on a "baffle them with BS" dog and pony show by Power Fasteners' salesman based on...
  9. rorschach

    Vibration Generation advice needed

    Goodvibe, Have you looked at the mechanism of Philip's Sonicare toothbrush? Theere may be possibilities there as well.
  10. rorschach

    Vibration Generation advice needed

    BTW, DAMN I envy your job.....
  11. rorschach

    Vibration Generation advice needed

    Is heat such a bad thing in this application?=D I would assume that we are not talking about continuous duty here (several hours). for safety, it should be possible to thermally limit the device to lower power operation if overheating is an issue.
  12. rorschach

    Problems with hydraulic machine vice

    Ok, I misunderstood how it worked, I was envisioning a hydraulically actuated vise. After re-reading your post, it snapped how it worked to me. Sorry. I agree you either have air in it, or a bad valve/seal somewhere in the system. The bellville's COULD be fatigued, but that does not sound like...
  13. rorschach

    Plating Foam materials

    I believe Ion vapor deposition is going to be the process you'll need. I've seen it used on plastics before, the problem yo MIGHT have is if the glass spheres in the Syntactic foam rupture in the vacuum that they'll be sujected to. I've never tried to use syntactic foam in a vacuum so I'm not...
  14. rorschach

    steel for -40¦ / +40¦

    Heh, heaven forbid that the europeans would deign to use an existing working standard instead of creating their own incompatible one just to be different.
  15. rorschach

    External Corrosion of Oil and Natural Gas Pipelines -- free chapter

    Kenvlach, Duplex is pretty common in downhole completion equipment as is Martensitic Stainless. I can't say about the piplines however.
  16. rorschach

    What does the error message "internal error #10" mean?

    Excellent! A Star for you!
  17. rorschach

    pipeline corrosion in Alaska ? ?

    Quick question, Is BP doing water injection on these reservoirs to boost output? If so, are they treating the injected water with biocides? In my oilfield corrosion class from the local chapter of ASM, one of the metallurgists teaching the class mentioned the fact that in some wells where water...
  18. rorschach

    Drill Pipe Thread Pitting

    Are these upset threads? Was the pipe fully normalized after upsetting or were just the upset ends normalized? I've seen selective corrosion in the thread area in wet CO2 wells with partially normalized upset pipe. In the industry it even has a name. It is called ringworm corrosion. That is what...
  19. rorschach

    Thread Sizing

    To add to screwman's and cory's posts, fine threads allow higher torques because the root diameter is larger than for coarser threads. and the reason why around 5 threads will take the load is simple elastic (or in severe instances, plastic) deformation allowing the threads to distort until...
  20. rorschach

    What does the error message "internal error #10" mean?

    I was just coming to post an identical question, (in fact I inadvertently posted it under the solidworks forum not realizing there was a separate one for COSMOS, mea culpa.) Here is the text of my post: I've been wrestling with a model that gets about 90% finished solving when I get an...

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