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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

    @drawoh Thank you for the response! 5052-H32 really does seem to be the bread and butter of most sheet metal shops I've dealt with, I've even had some quote flats specced as 6061-T6 in 5052 without even asking if it was acceptable [upsidedown] However, if there really is no cracking (and that...
  4. 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...
  5. sheafromme

    Stress Concentration in D-Profile Shaft

    @desertfox Thank you for the response! I did find that the overhung load was over mfg specs and have already implemented a better tensioning procedure. Unfortunately, some failed units were below the overhung load spec and there are also a lot of these in the field already. I inherited this...
  6. sheafromme

    Stress Concentration in D-Profile Shaft

    @rb1957 Definitely makes sense, I'm almost entirely certain that the belt tension is the culprit but not entirely sure in what way it causes failure besides excessive stress concentration at the flat to shaft transition. Motor design and some other parameters are fixed unfortunately. This is...
  7. sheafromme

    Stress Concentration in D-Profile Shaft

    @Jboggs Thanks for your response, I have since updated the tensioning procedure for exactly the reasons you laid out [hourglass] I think I may end up flipping the pulley around because otherwise it has to rest right at that flat transition due to other assembly constraints.
  8. sheafromme

    Stress Concentration in D-Profile Shaft

    @MintJulep It's partially my own interest to see if I can make theoretical converge with the field results and also to fulfill a requirement for the report haha!
  9. sheafromme

    Stress Concentration in D-Profile Shaft

    @TugboatEng Thank you for the input and resource, I think the manufacturer could do something to help out with the undercut; I'll reach out to them about it!
  10. sheafromme

    Stress Concentration in D-Profile Shaft

    @dvd Thanks for the response! My spec for the tension is now below the mfg allowable overhung load [dazed] unfortunately there are a lot in the field that already got delivered apparently. I think you may be onto something with the motor use-case; the literature seems to reflect that at least...
  11. sheafromme

    Stress Concentration in D-Profile Shaft

    @Tmoose I actually think I may go with the flipped pulley suggestion you had, it would allow the flat transition to be within the pulley instead. I already developed a tensioning procedure that prevents over-tensioning (ostensibly) but there are hundreds in the field already... I'm...
  12. sheafromme

    Stress Concentration in D-Profile Shaft

    @3DDave Thank you for the response! That's what I feared...definitely makes sense about just avoiding the situation altogether but unfortunately I'm a bit backed into a corner in that I have a relatively narrow scope of allowable action on this. I could definitely see if the supplier could...
  13. 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...
  14. sheafromme

    Wear of rubber tire on pvc pipe

    @moon161 sounds good, will do!
  15. 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...
  16. 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...
  17. sheafromme

    Securing pulley to stepper motor shaft

    drawoh, I hate set screws as well, they always seem to be a worse way of doing something that has already been correctly solved. It's on a stepper motor indeed and it's supposed to move back and forth relatively rapidly (5Hz or so), so I really don't like the idea of using a set screw in...
  18. 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...
  19. sheafromme

    Optical Encoder Axial Tolerance

    @IRstuff Thank you for the input! When you say angle error are you referring to an error in the wheel angle itself or the encoder angle output? I apologize if this is relatively fundamental I am just having trouble visualizing how such a small displacement could cause such a large error. Best, -Shea
  20. sheafromme

    Optical Encoder Axial Tolerance

    @3DDave thank you for the response! I had assumed it meant displacement along the axis of rotation, but based on what you're saying it's referring to the distance between the shaft axis and "ideal" axis location? With some bench-top tests I've noticed that the encoder sometimes misses a few...

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