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Recent content by dgeesaman

  1. dgeesaman

    Need help sourcing a custom-made Buna O-ring.

    Wow my experience with that kind of thing is the complete opposite. I can think of an automotive gasket that is NLA and its shape is 80% circular 20% triangular with huge radii. The OEM gasket, when you could buy it, was an o-ring that was somehow formed a bit to hold that shape. Now we just...
  2. dgeesaman

    Decreasing operating range of seal elements over the years

    My company has provided mechanical seals on some of the machinery we build/sell for decades now. In the early days, the seals were quite limited in range. Then as materials improved and mechanical designs developed, some seals were advertised to handle more shaft runout, higher operating...
  3. dgeesaman

    I asked my AI

    And that's the point - a reader can tell from context when it's a fraction vs. equation. Google AI will trip up on that.
  4. dgeesaman

    I asked my AI

    Feed one a mix of fraction and decimal numbers. 7-1/2 is suddenly 6.5.
  5. dgeesaman

    Struggling to Bridge Academic Success & Practical Experience in Aero Eng. Help

    In my world, which is admittedly not aerospace, we hire mechanical engineers and very roughly sort them by their GPA either towards Sales or towards R&D. High GPAs tend to be individuals who focused on grades, know how to work alone and remain focused and had not much social activity vs. lower...
  6. dgeesaman

    Shaft Failure in Translation Gear Reducer of Bucket Wheel – Need Help Identifying Cause

    It is very likely your home engineered replacement is not equivalent to the original. Just saying. I've looked at failed home-made replacements to the shafts I design and I can see the differences from several feet away. But they can be subtle if it's not your specialty. And I don't explain...
  7. dgeesaman

    Shaft Failure in Translation Gear Reducer of Bucket Wheel – Need Help Identifying Cause

    Is the shaft an OEM parts or a home-engineered replacement? Is that a gear reducer hanging on the shaft without external support? If so, what is its weight relative to the original design? If there is a rigid or spring-loaded support on the drive, how are you sure it's taking up the correct...
  8. dgeesaman

    Machinery supports vs. structural steel

    I am perfectly happy to call in consulting engineers for this kind of work. My feathers ruffle when I sense it's gross overkill (like an adapter plate that covers a larger opening and extends a couple feet past the natural boundary of my machine), and they won't give clarity on what is and...
  9. dgeesaman

    Machinery supports vs. structural steel

    The duck test works if you're familiar enough with ducks. I'm a machinery guy and I've never been closely involved with coded structural design. I know in pressure codes (vessel, piping) a piece of machinery that is attached to the pressurized system does not need to be designed in accordance...
  10. dgeesaman

    Machinery supports vs. structural steel

    I work for a machinery supplier. We are sometimes asked to include a custom mounting adapter plate or frame structure to cover an opening in the steelwork that is larger than our machine. This may include some live load requirements since mechanics will need to walk on it to inspect and...
  11. dgeesaman

    NPT thread strength - Stress Distribution / Tensile Area

    When the design goal is to make a cheap connection that will fracture unpredictably under external load, NPT is perfect.
  12. dgeesaman

    Applied Acceleration At Boundary Condition

    Is it a constant acceleration? If so, apply a force. You'll have to remove some boundary conditions for it to have effect. The only global acceleration that I've worked with is gravitational, which acts on all elements simultaneously.
  13. dgeesaman

    Seeking Full 3D Model of Pemserter Haeger 824 Press Machine

    For all companies I've ever worked for or done business with, that is proprietary data. You're going to need to disassemble and reverse engineer your machine.
  14. dgeesaman

    How Can You Prevent Laser Cutting Machine Head Collisions?

    Some CMM systems have a collision detection system that does that, but that's a very different kind of machine with much less kinetic energy.
  15. dgeesaman

    Clearance Recommendation

    I don't know what tolerance of form is reasonable for that bore and that pin but my first draft would probably have .003 to .005" of clearance on diameter. If the cylindricities are more than a couple thou then the max clearance can increase more. This would probably require o-rings or oil...
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