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Recent content by ChrisGill

  1. ChrisGill

    measuring wrap thickness

    Hey guys, I work in a facility that makes ink reservoirs for markers. Simply put, we extrude plastic around yarn. Several different plastics are used in the yarn and the wrap, but that shouldn't be relevant to my question. We extrude our wrap pretty much the same way that drinking straws are...
  2. ChrisGill

    measuring the wall thickness of extruded plastic

    Hey guys, I work in a facility that makes ink reservoirs for markers. Simply put, we extruder plastic around yarn. Several different plastics are used in the yarn and the wrap, but that shouldn't be relevant to my question. We extrude our wrap pretty much the same way that drinking straws...
  3. ChrisGill

    ForceEffect

    Hello all, I'm a student in a statics class. The professor assigned a project using ForceEffect. He said that there is a PC version (he DOES NOT want us using a mobile version). I have since asked him where to find the PC version and he says he forgot. Does this software exist? I've...
  4. ChrisGill

    Aluminum shear strength

    Exactly what I was looking for. Thanks Corypad
  5. ChrisGill

    Aluminum shear strength

    We've just recently started installing SS bushing where the holes fail. That works better, but we've had them fail as well. The issue is getting the torque as low as possible and still keep the powder from going inbetween plates. I thought I might be able to calculate this torque. I think your...
  6. ChrisGill

    Aluminum shear strength

    I gave you the wrong numbers. It's a 125 ton press. Don't know if that changes anything. So, you're saying the the metal will expand at the same rate, even with that much force on it? We've tried clamping and magnets, both to no avail. We vibrate the molds before putting them in the press. If...
  7. ChrisGill

    Aluminum shear strength

    I remember now why I hadn't considered expansion... The mold is in a 20 ton hydraulic press set at 1400 psi while it is being heated. I'm guessing that under that type of stress, the Al isn't going to expand the same.
  8. ChrisGill

    Aluminum shear strength

    So, I was actually thinking the heat was making the Al weaker, but, as simple an idea as it is, I hadn't considered the expansion. Looks like I'll be doing some trials today. Thanks for the thermodynamic insight. It's something I hadn't considered.
  9. ChrisGill

    Aluminum shear strength

    Unfortunately, I do not have pictures available. Even if I did, I doubt I'd be able to capture the failure well enough for you to get anything out of it. Tbuelna, the way you describe it is correct. When the counterbored holes fail and become through holes, we fabricate SS bushings to fix. In...
  10. ChrisGill

    Aluminum shear strength

    No way to tighten after heat. We use hydraulic presses to heat. I'm intrigued by your "losing its strength" idea. I've been asking the same question. Since Al doesn't anneal until 600 or 700 F (don't remember exactly), the theory was that the Al properties don't change. I've suggested that the...
  11. ChrisGill

    Aluminum shear strength

    We are joining 3-4 coated plates with the bolts. They are assembled and disassembled after each cycle. Zero seam is what we are shooting for. Counter bored holes are as deep as the bolt head. Which, by the way, are socket bolts. There is anywhere from a 1/4" to 2" of metal underneath the bolt...
  12. ChrisGill

    Aluminum shear strength

    For the last three years I have been working on 6061 Al molds coated with Ni and Teflon. It's a similar process to mold injection. Recently we've been experiencing some issues with the integrity of the Al. We have 8 counter-sunk through holes on the mold. 1/4-20 bolts are used. Four 3" bolts...
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