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  1. engineerfin

    8.8 tensile strength

    25,000lb? With perfect matching strength threads, I sure would like to see that single m10 lift a mack semi tractor.
  2. engineerfin

    8.8 tensile strength

    I used this calculator for the thread shear: https://www.engineersedge.com/calculators/external-thread-shear-area.htm
  3. engineerfin

    8.8 tensile strength

    Yes shear on threads. I thought someone was asking if the bolt itself was in shear. Its the bolted plate scenario, tensile in bolt direction. I have used multiple formulas and have come up with the same number. Is that in PSI and if thats the case do I multiply the area of the bolt x the psi...
  4. engineerfin

    8.8 tensile strength

    Its cast iron. Static, not dynamic and its tensile, not shear.
  5. engineerfin

    8.8 tensile strength

    See if my math works: 10mm bolt = .375 shear dia x pi x thread eng x material shear strength = .375 x 3.1415 x 1" x 2922psi = 3442psi thread pull out. Hard to believe.
  6. engineerfin

    8.8 tensile strength

    I have some 8.8 10mm metric bolts that will experience load in tension. Rated at 830mpa but I am thinking I should be more concerned with thread pullout then tensile. I Could not purchase 10.9 bolts so was wondering if these would work and what the calculation would be for the thread pullout.
  7. engineerfin

    Motor windings at commutator

    Worked perfect. You are the motor man! thanks
  8. engineerfin

    Motor windings at commutator

    Can you guys tell me how to figure out this wiring problem. Only one bar is disconnected. All others have continuity but I have 3 loose wires. 2 have continuity to each other only, the other has continuity to all the bars. How di I wire this back up?
  9. engineerfin

    Roller Bearing Cross ref

    I cant seem to find a cross ref for 2 Hoover bearings 97200 and 97201. What year did they standardize? I am thinking somewhere in the 70's
  10. engineerfin

    Skylight Thermal Bridging

    Its an existing condition. Wood frame causing a thermal bridge
  11. engineerfin

    Skylight Thermal Bridging

    Any of you have run into problems with Thermal Bridging due to skylights?
  12. engineerfin

    Need a UL for a 1hr ceiling

    Need a ul for a ceiling made from steel studs and type X on one side. Cant seem to find it.
  13. engineerfin

    NEC

    anyone know if you have to have a rated wall to install a hydraulic pump/motor in the wall?
  14. engineerfin

    1hr rated storefront

    interior storefront. pleanty of reasons like a one hour rated corridor. maybe in a school , an admin office off a corridor where you can see thru into the office or classroom. i think i have seen these online but someone told me you need wire glass for 1hr rating.
  15. engineerfin

    1hr rated storefront

    Do you have to have wire glass in a 1 hour rated storefront. I thought I some rated ones that were clear glass and 1 hr rated, 2 1/2" thick frame.
  16. engineerfin

    NFPA 42.8.1.3.3

    Most building codes like the ICC mimic the NFPA or vice versa but rear like this: 406.3.3.1 Openings. For natural ventilation purposes, the exterior side of the structure shall have uniformly distributed openings on two or more sides. The area of such openings in exterior walls on a tier must be...
  17. engineerfin

    NFPA 42.8.1.3.3

    This section on interior walls in a parking garage are vague. What if the wall is small like 10 feet. Are you suppose to have a 20% opening in that.
  18. engineerfin

    nfpa 101 3.3.254.6

    Did they revise this section about parking garages drastically? It just references atmospheres now. Where in the nfpa 101 does it talk about parking garage design using natural atmosphere.
  19. engineerfin

    Rooftop Equipment

    Is there anything in the mechanical codes that talks about using screens around roof top equipment. I cant find anything in the municipal codes about not viewing equipment from the street but I am sure its there.
  20. engineerfin

    UL rated walls

    What if I need a wall that is similar to UL 445 but I need different side sides and/or air gap. Cant seem to find one that matches.

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