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Recent content by apMechE

  1. apMechE

    Double Ellipse Galloping

    Best reference material to better understand double ellipse galloping and whether to take steps to mitigate the analysis from PLS?
  2. apMechE

    ACSR to ACCC without considering ACSS

    We have not used any ACSS. I think we need to make a comprehensive comparison table weighing the options based on the scenario and goal. The qualitative characteristics such as resiliency carries significant weight. Hard to step away from something that has steel in it. More or less, reps...
  3. apMechE

    ACSR to ACCC without considering ACSS

    Logical reason to jump from ACSR to ACCC without considering ACSS? Currently utilizing 477 ACSR on 69 line and being pushing to jump to ACCC without cconsidering any ACSS options.
  4. apMechE

    H-structure, Ductile Poles, Pupi Arms and Braces...Alternatives?

    Rebuilding some 69kV T line in some rolling hills where I am forced to replicate what is there today, H-structures with 600-800' spans. I have recently spec'd ductile poles with Pupi fiberglass crossarms (2 arms, currently spec'ing a single arm), braces, and cross brace arrangement. Curious...
  5. apMechE

    NESC or recommended distance between rail fuel loadout (explosive fumes) and substation?

    Have an existing substation and looking for numbers on how close a rail loadout of diesel and other fuels can be placed in proximity to it.
  6. apMechE

    PE Exam for specialized field

    Makes sense, same advice I have received from my supervisor. Take the one you have the best chance of passing. Then as I learn, do and wean ourselves off our consultants, I would feel competent enough to seal any design related to substation and transmission within reason. The prior civil...
  7. apMechE

    PE Exam for specialized field

    Mechanical engineer hired to replace a Civil at a utility coop. Involved with substation and line design. Passed the FE, now what PE should I take? Mechanical Machine Design since it was the field I studied and worked for 5 yrs? Civil Construction, more relevant, though will only utilize a...
  8. apMechE

    How do you call out a square counterbore?

    drawoh, Attached is a screenshot. From your statement I am guessing we add a profile tolerance and relate it back to the primary datums along with a parallel tolerance to the opposing face or a perpendicular tolerance to the hole?
  9. apMechE

    How do you call out a square counterbore?

    I have a cast part with a square counterbore on the the backside of a hole so the nut will seat against the face. I am working on getting my GD&T skills up to speed though wondering the best way to define this feature? Can you still use a diameter position tolerance just as you would with a...
  10. apMechE

    3 track turning radius

    Correct dhengr... I am at the forefront of a redesign and am not using slew gears to have 360 degrees of turning at each track. I just want to make sure my stance is narrow enough with plenty of turn angle at each track (cylinder stroke) to guarantee the machine can match whatever software or...
  11. apMechE

    3 track turning radius

    Thanks 3DDave. Makes sense... you can even see it watching the Gomer video.
  12. apMechE

    3 track turning radius

    Curious if anyone knows how to calculate the turning radius of a 3 track machine, such as a curb and gutter slipform paver?
  13. apMechE

    Screw Auger HP/ Torque Calc

    Anyone have a good source for assisting in calculating HP or torque required for screw augers? My application is an auger for the front of a slip form paver. 18'' fight, 6'' tube, 45-60 rpm max, metering concrete in an open trough concept, so pushing material over material. Overall length is...

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