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  • Users: sheafromme
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  1. sheafromme

    How to find a PE for consult and stamping of tower plans

    I have designed and built a self-supporting guyed lattice tower for use in the oil and gas industry. Several hundred have been sold and installed across NA but have mostly been pilot programs. For larger orders, most companies are (understandably) requiring PE stamps for the design. They had...
  2. sheafromme

    Does this type of connector exist??

    Hello, I have looked high and low for something that meets these requirements and I cannot find a single component that matches them, am I crazy or should this exist? - Male-Female mating pair - Both panel mount - Mating but not locking (this seems to be the hardest requirement to meet) -...
  3. sheafromme

    Bending 6061-T6

    Hi all, I inherited a sheet metal part design that has some tabs bent on it that allow tensioned stabilizing lines (basically guy wires, but for a dock) to loop through as a tie-off point. I've gathered that the previous designer was very weight-conscious so specced the part as .188" 6061-T6...
  4. sheafromme

    Stress Concentration in D-Profile Shaft

    Hello, I'm having trouble determining how to account for stress concentrations at the root of the flat on a motor shaft due to overhung radial loading. I inherited a motor/pulley assembly that has an propensity for the shaft to snap off right at where it transitions from a D-shape to circular...
  5. sheafromme

    Wear of rubber tire on pvc pipe

    Hi, As a project I'm making a robot that travels inside of a PVC pipe track (kind of a reverse train track). It has rubber wheels and weighs approximately 10 kg. I want to look into the long-term wear of the rubber wheels on the PVC pipe but in school we didn't learn much about wear beyond...
  6. sheafromme

    Need help accurately modeling M77 x .75 mm thread

    I am trying to get a custom optical part made and need to model the threads in SolidWorks for the machinist. The threads have to be M77 x .75 but I cannot find it in any of the typical resources I consult; either the charts stop around M50 or only do coarse threads in the M77 range. I need to...
  7. sheafromme

    Securing pulley to stepper motor shaft

    A stepper motor with a 5mm shaft was specced and passed along to me to affix a 14-tooth pulley to. The motor has a flat machined on the shaft and is clearly set up for a setscrew-style attachment. Additionally, the pulleys in the correct sizing also use setscrews. This is a problem because...
  8. sheafromme

    Optical Encoder Axial Tolerance

    I am using an Avago AEDM-5810-Z06 Optical Encoder and the data sheet (Link) lists a "Shaft Perpendicularity Plus Axial Displacement" value of 15 mm (.006") under the "Recommended Operating Conditions" (Pg.3). This is a tiny tolerance compared to some of the others on the sheet so I was wondering...
  9. sheafromme

    Cable Rotation

    Hello, I am designing an electronics package for a camera that pans back and forth 180˚ but never completes a revolution. Currently I have the power cable going down along the pan axis and out through an IP-68 cable gland in the bottom of the enclosure. This works for weather protection but I...
  10. sheafromme

    Effect of Solar Shield on Electronics Enclosure

    Hello All, Longtime reader but this is my first post. I am designing a prototype of an electronics package that will sit out on a pole in the sun 24/7 with a max ambient temperature of 50˚C and at 30˚N latitude. It produces 50W of internal heat and the electronics are rated to 70˚C...

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