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  1. dhengr

    Hood Support CMC 508.4

    Hawkaz: The 800lbs. also likely includes an EQ (earthquake) component which should/might be applied in any direction. Other mech. equip., like water heaters and storage tanks must be tied back to the structure for lateral EQ loads too. You should always read the code commentary. That’s often...
  2. dhengr

    Mechanical Equipment or Piping Engineering

    Skyspectre: I’d take whichever field or position (equipment or piping) which had an opening and offer of a job without too much loss in pay. It seems you are kinda interested in both, and they are fairly similar, but you have little explicit/real experience in either. And, what you really need...
  3. dhengr

    Ftigue Information

    Antonis25: None of the people who have posted got angered or or particularly sarcastic, but the question was asked, answered quite nicely, by John, and then asked again; as though you didn’t bother the read the answers. The guys who have participated in this thread are top-of-the-class here on...
  4. dhengr

    Ftigue Information

    Antonis25: Yup, that’s what an S-N curve looks like, but it really tells you so little. See where that research came from, what the samples looked like, and what the testing methods were, etc., and it gives you a bit of info. about the bulk material properties. And, you can compare the Al 5052...
  5. dhengr

    Drawing Note for Machine Parts Coming In Damaged?

    Ggotpho: Why not a contractual paragraph, something to the effect that..., the contractor is responsible for the quality and final condition of all parts until they are unpacked and inspected, upon receipt, at your plant. This includes, but is not limited to, inspections at their plant, after...
  6. dhengr

    Pelican parts cracked. How to reproduce ?

    RQuestionEngineering: You could probably get a pair of pelicans to ‘reproduce’ for less than $29.99. Get the right pair and they might actually enjoy it. But, they all come with cracks in various places.
  7. dhengr

    Positioner for car dumper

    Mte12: The manufacturer of the dumper should give you foundation loads, design criteria, and general layout plans. The primary foundations and loads are at/near the two end rings visible your photo. The primary rotary drivers are usually large pinion gears driving large ring gears on those end...
  8. dhengr

    Non magnetic rails

    Drodrig: There is enough unsaid in you problem description to fill a fairly good sized book. 6.5' dia. and 26' longitudinal travel of the alum. chamber, in a straight line, from outside the magnet to its final position inside the magnet, seems understandable. But, which moves, the magnet or...
  9. dhengr

    Gravity Battery

    Come on you guys, so many nay-sayers? They are going to make the energy storage blocks out of solid lithium, they heard that’s pretty good for energy storage batteries.
  10. dhengr

    Creating a clamping device

    Dogboy74: Why not a 1" thk. steel plate, the diameter of the bot. of the inside of the bucket, this for weight and stability of the whole system. Maybe 4" of concrete in the bot. of the pail. This pl. has a hole for the vac. pipe, fits in the bot. of the bucket and has a 2" std. pipe coupling...
  11. dhengr

    Can I improve this mechanism? (Perpendicular Linear Movement)

    Zeroburn315: You need a straight horizontal force link to the right of the upper right pin hole. You need linear sliding guides at the outer end of this force link and the vert. force link on the lower left. These sliding guides will make those end motions truly linear, and the force links...
  12. dhengr

    Ball bearing repair

    Nashanas: It is really important to be able to see photos, engineering drawings or well proportioned sketches with dimensions, etc., so as to understand how the system works, what that bearing really does, along with the arm capacity, dimensions, and the like. I suspect that the best solution...
  13. dhengr

    How are quick links manufactured?

    SwinnyGG: O.K. Then you are sorta unthreading the blind end as you are fully engaging the threads on the open end, until it tightens against that stop enlargement/collar. This is just fine, as long as the blind thread is long enough to stay fully engaged too. In this way, you are not flexing...
  14. dhengr

    How are quick links manufactured?

    Kjoiner: I’ll bet there is no thread on the blind end of the curved round bar. It is upset and finished to a mating round (partial hemispheric) bearing surface to match with the inner bearing surface on the nut/coupler. The nut is then put onto the straight round bar and that end of the bar is...
  15. dhengr

    Moment required to prevent (free) falling object from rotating

    Gios: Actually, a real “conservation of energy” would have most of us ignoring these kinds of silly questions/problems, and spending our time working for the guy (or company) who is actually paying us. These kinds of questions should be asked of their T.A. or Prof., so the whole class can...
  16. dhengr

    Help With Bending Stress Calculation

    MarkJWilson: There is so much about this problem which we know nothing about, which makes it hardly worth commenting on. You just think…, stand clear, and let him at it, and see what happens. Most often the best learned lessons are from expensive mistakes, by the inexperienced and those with...
  17. dhengr

    Pursuing PE at 40 years old?

    232gulfstream: Good on you. After 14 years of HVAC engineering work, and the general engineering which goes along with that, and if you’re good at what you do, the FE and PE probably won’t really make you a much better engineer. But the PE is still a feather in your cap and opens up some new...
  18. dhengr

    Lifting solution for large steel structure

    Majkus: You say…, “there are parts of the design i am not willing to describe, share for obvious reasons.” O.K., but, nobody is asking for your bank account number or the keys to your house, or national security info. And although, apparently not obvious to you, there are “obvious reasons” why...
  19. dhengr

    Where to publish a device prototype for application testing

    Magwheels123: Your paper probably won’t fly, except as a paper airplane, unless you give some more meaningful info than you have here, in your OP. I wouldn’t publish on a prototype nuclear reactor in the same place, or to the same group, as I might publish on a heart valve or pacemaker. But...
  20. dhengr

    Launch and recovery system (LARS / A-frame) Need some ideas.

    BEMPE16524: I suspect hat the RH and LH frames are essentially identical in terms of member sizes, dimensions, locations of pivot points and lifting cylinders, etc. And, that the circular crosshead beam will rotate to allow the load to hang vertically if the operator wishes. The A-frame must...

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