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Recent content by Compositepro

  1. Compositepro

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

    Custom O-rings are commonly made from rolls of O-ring stock. The groove should be slightly narrower than the O-ring cross-section to keep the O-ring in the groove. The stock should be cut slightly longer than needed so that the splice is under compression. Then you do not even need to glue the...
  2. Compositepro

    U-bend before pump suction inlet.

    It makes the pumps self-priming to some extent, in that it keeps water from draining completely out of the pump casing. There is a tee on the pump discharge with a ball valve for adding priming water (or pulling vacùum).
  3. Compositepro

    How to reduce fiber damage

    I know nothing of your simulation but I do know that what prevents fiber damage is delamination of the plies due to exceeding the shear strength of the resin. You must also account for the shear stress between plies caused by cure shrinkage and the difference in CTE (coefficient of thermal...
  4. Compositepro

    Miscellaneous Heat Load For Industrial machines

    Typically all the work done by these type of machines is 100 percent converted to heat. However, the work done is rarely as much as the nameplate capacity of the machine. The actual work can be measured or calculated using some physics and some assumptions.
  5. Compositepro

    Looking for Auto-Leveling Solutions & Mechanisms for MSLA Printers

    You appear to be using the terms leveling and alignment interchangeably. They are not the same thing. Leveling means alignment to the direction of gravity. Alignment means making the plates parallel to each other.
  6. Compositepro

    Crevice corrosion in 316L threaded fitting

    Sea water is not sterile, so why would you rinse with it? If you are using UV to sterilize the rinse water, your testing is showing that not to be effective.
  7. Compositepro

    NPT thread strength - Stress Distribution / Tensile Area

    I am not referring to hydraulic fittings, but mechanical...
  8. Compositepro

    Designing a custom pipe run with potential measurement inaccuracies

    Sounds like my first project out of school in a chemical plant. Replace several thousand feet of corroded 3" vent piping that ran the whole plant with new Kynar lined pipe. Just used a tape measure and isometric graph paper. I had to crawl though many crowded pipe racks. You, or your...
  9. Compositepro

    Hole size for PVC fire gear dryer

    You also need to consider where the dried water goes. It appears that you are not using any heat. Is this inside or outside? You may be better off with a dehumidifier in a closed room with good hangers and your blower or fan to circulate air. At high humidity there is no drying, even with a lot...
  10. Compositepro

    Low Barcol Hardness Readings after switching materials (Phenolic Prepregs 270°F cure)

    Phenolics are condensation cure polymers, meaning that water is generated during cure. This water is usually trapped in the polymer after cure and acts as a plasticizer. An oven bake after cure should be done to allow this water to diffuse out of your part. This needs to be done with some care...
  11. Compositepro

    Correct design and detailing of X bracing in the middle Brace-to-Brace connection? (one story, so not beam there)

    Isn't this type of bracing "tension only", and a connection at the crossing point is unnecessary, or only to prevent slapping?
  12. Compositepro

    NPT thread strength - Stress Distribution / Tensile Area

    Enerpac uses NPT threads to connect their hydraulic rams to a multitude of fixtures and extensions. It is not unusual for NPT threads to be used for structural applications. For example, railings and floor flanges.
  13. Compositepro

    machine elements power-force formula

    I recall having somewhat similar thoughts as a new graduate. F equal ma is fundamentally used to determine when the equations of statics applies. When nothing is accellerating, a is zero. Thus, F is zero. Which means all the forces must be exactly balanced. This concept seems trivial at first...
  14. Compositepro

    Warpage Issue in 92mm HDPE Cap – 6 Cavity Hot Runner Mold

    The webpage is most likely due to the top of the cap being much warmer than the rest is the cap upon ejection from the mold. Thus it cools and shrinks more. Orientation of the polymer due to flow is also a factor. Longer cooling time and perhaps warmer mold temperature should help. It will...
  15. Compositepro

    Maximum Temperature Rise for Fused Disconnect

    In addition, the zinc particles are for corrosion protection, not for conducting large current. Particles act as spacers between two flat surfaces. You certainly do not want to use something with carbon.
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