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  • Users: apMechE
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  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

    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.
  3. 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...
  4. 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.
  5. 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...
  6. 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...
  7. 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?
  8. 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...
  9. apMechE

    Sprocket and gear sizing coupled to ACME thread

    I need to size a chain and sprockets to pry apart roughly 50 ton. I am looking at using 4 - 2'' ACME screws (2 LH, 2 RH) driven in the center with a high torque hydraulic motor (capable of around 10000 in*lbs) coupled to two sprockets. I also want speed to be fairly controlled through the gear...
  10. apMechE

    How to calculate the free area in a set of louvers?

    I have to calculate the free area through a set of 14ga 30-45 degree louvers and not sure what to take into consideration. It has to be more than just subtracting the area taken up by the material thickness isn't it? How do you take the bends into consideration?
  11. apMechE

    Grade 8.8 Shear Angle

    What would be the preferred groove (radius, v, or square the cross section) for inducing the stress concentration into a shear bolt?
  12. apMechE

    Bronze bushing press fit tolerances

    Anyone have any good reference material for press fit tolerances for sleeve bushings? Designing bronze sleeve bushings for a 6'' shaft pinned pivot joint.
  13. apMechE

    Welding 4140 or 8620 to A36 or A572 Grade 50 plate

    I am looking at welding 4140 or 8620 annealed, not prehardened, to mild steel. From what I've read, 8620 would be the better choice due to its lower amount of carbon. All I find is that preheat is recommended for the prehardened forms... is that needed for the non-prehardened materials? The size...

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