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  1. JNieman

    Are there true advantages in degrees from prestigious universities?

    If you aren't plastering your Alma Mater on your office walls, how would anyone really know/care where you came from, beyond such conversations during interviews or the hiring process? Do people sit around in their 30s and 40s and still banter about what school they went to? Anyway, I think...
  2. JNieman

    Machining before plating

    Same as looslib. Hard-coat anodizing has larger buildup and that's almost always accounted for, unless it's comparatively large tolerances, but if the plating is less than 10% of the tolerance I might not worry about it. Depends on your expectations from your machines and machinists, on...
  3. JNieman

    Machining

    You guys must have 90deg drill heads much smaller than any I've seen, given the dimensions of the part. I think it would be wiser to redesign unless mass production justifies specialized tooling that won't directly inflate the component price dramatically.
  4. JNieman

    What are the strategies you guys follow to keep your mind peaceful during this busy life?

    I didn't particularly notice it until it was pointed out, but yes, it feels a bit spammy.
  5. JNieman

    New Netflix show

    Having read "Truth, Lies, and O-Rings" twice, at least, it was nice to see the video of some of the panel discussions, such as Feynman's famous ice water demonstration. I found the show to be very well done, and I appreciated the extra perspective provided, that wasn't in the books (or I forgot...
  6. JNieman

    What are the strategies you guys follow to keep your mind peaceful during this busy life?

    So we're back in the office nowadays. We just built a new building to move into, so we have about 2x the space (at least) we'd require, so spreading out is quite easy for us! However, we were at home for over 6 months. What I found to be the best was to keep my routines. Wake up at the...
  7. JNieman

    A use for Large Metal Additive Mfr with Weld Wire?

    @dhengr I think it's safe to say that is not the same nature of AM that most people are discussing when we discuss additive manufacturing :)
  8. JNieman

    A use for Large Metal Additive Mfr with Weld Wire?

    Well, see, that's just the thing that prompts me to lean toward its state of maturity rather than simply being in development. You can certainly call out any spec you require for any other material stock and require a part made via some AM process comply. I was just reading about ExOne, a...
  9. JNieman

    A use for Large Metal Additive Mfr with Weld Wire?

    Yea, the places doing "job shop" type printing of parts is pretty well set when you're talking about plastics, nylons, and small metal parts. We currently have some of our standard designs outsourced through Xometry for SLS production from nylon powder. When we start talking about large...
  10. JNieman

    Has Eng-Tips buffed up your resume?

    I'm always open to unusual facts and claims on a person's resume. A coworker recently interviewed someone at a local university for a co-op position. He had claimed on there, that he created a Minecraft mod with some-many-millions of downloads. Another coworker who plays Minecraft claimed...
  11. JNieman

    A use for Large Metal Additive Mfr with Weld Wire?

    Too true, re: pace of advancement. One big difference between traditional machining and additive machines... you can throw just about anything in a CNC mill and it'll cut it up. AM machines are much more restricted to materials, I believe. I don't know if that can change much. That was part...
  12. JNieman

    A use for Large Metal Additive Mfr with Weld Wire?

    Sciaky is a great example. They transitioned from welding technology to additive successfully, it seems. I had the reservations you did, as well, when I first started looking into additive processes to merge into current workflows and design possibilities. It appears to be that process...
  13. JNieman

    A use for Large Metal Additive Mfr with Weld Wire?

    I've been researching more and more about Wire Arc Additive Manufacturing technology. The state of things seems to be pretty respectable, but not widely adopted as far as I can tell. The technical aspects all make sense. The final material quality, with good weld procedures, wire, and...
  14. JNieman

    Can I put Position control on a Radius

    Some standards are defined in design program contracts, some of which may last several decades, leaving 'migration' out of reach.
  15. JNieman

    Can I put Position control on a Radius

    That would be exceptionally difficult and may not actually represent the requirements of the geometry. We make some large rings with radii that are either clearance for mating components, or not-quite-precise locating surfaces for other components. Using profile-of-a-surface has yielded...
  16. JNieman

    Square Tube Bending Rule of Thumb?

    Seems to me that stacks of shims would cause the outer wall to simply rupture and tear. The sand that's used is good because it allows the tube to distort and bow inward as required to reduce tension. Be stacking up shims inside, you're eliminating that possibility and requiring the outer wall...
  17. JNieman

    Difference between ARMS and Picatinny rails?

    Perfect is, indeed, often the enemy of good-enough.
  18. JNieman

    Difference between ARMS and Picatinny rails?

    Repeatable being quite subjective when you have things being mounted from a simple white light device to optics meant to provide reasonably accurate point of aim out to 1km. But yea, I think that drawing is why some folk think "Good enough for gov't work" doesn't mean "Rigorously evaluated to...
  19. JNieman

    Difference between ARMS and Picatinny rails?

    Right. There's typically a screw driven clamp on one side, opposite a fixed 'jaw'. It's a pretty resilient system. Others have a fixed jaw opposite a cam operated (usually) by a throw lever. It hasn't been this popular because it was finicky. It's pretty idiot-proof.
  20. JNieman

    MIL-STD-1913

    Doesn't matter. Half the people alleging to manufacture "mil spec" pic rail commercially probably never actually read the MIL-STD-1913 doc anyways.

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