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  1. atvhead

    Shot Penning

    Good afternoon all: I am in search of the Military shot penning spec. MIL-13165 Does anyone know where i can get a copy of this? Thanks guys Bob _innov8_
  2. atvhead

    Fatigue Limit Calculation

    and yes, i opened right up to my college book "mech eng design" by shigley once you said it. thanks for the tip. good book. Bob _innov8_
  3. atvhead

    Fatigue Limit Calculation

    satchmo - thanks for the quick answer. i think i am just putting in too much thought here. i have done the endurance calculation using 0.5 * Sult, and then multiplied all my correction factors, notch sen, temp, reliability etc. with the endurance limit. and yes, it is much much lower. like...
  4. atvhead

    Fatigue Limit Calculation

    how do you guys calculate fatigue limit? i have been told to use 0.5 or 0.4 of the ultimate tensile strength but ive also be shown to use 0.4 of the ultimate or 0.75 the yield strength, whichever is lowest. what do you guys think? and could you direct me to somewhere that says which method to...
  5. atvhead

    AC 3 phase electric motor

    Sorry, my fault for leading everyone to a VFD. There is no VFD present on this motor. Bob _innov8_
  6. atvhead

    AC 3 phase electric motor

    i want to thank everyone for the input. this has been a tremendous help. i do know that this motor does not have a VFD, it is simply 575volt to a constant speed 460volt motor. since in fact this motor (to my knowledge) has not failed or even kicked out a fail safe, then it just isnt drawing a...
  7. atvhead

    AC 3 phase electric motor

    thank you so much! Bob _innov8_
  8. atvhead

    AC 3 phase electric motor

    thank you so much for all the input. i feel much better when dealing with AC constant speed motors. Has anyone ever heard of Cowern's Papers? Bob _innov8_
  9. atvhead

    AC 3 phase electric motor

    Thanks Dan, that is a big help. i think we are going to advise the customer to let us size the motor and fan properly based on 575volts. sizing the fan and motor is no major task - but when the customer asked us some questions about this blower and told us what was on the nameplate, I couldn't...
  10. atvhead

    AC 3 phase electric motor

    Thanks so much everyone for all the information. What happened here is the customer has a high pressure blower/fan (FRP) with a 5hp motor rated for 460volt (motor speed is 1750RPM and blower speed is 2256RPM). This will supply a CFM of 960 at 8". he has been running 575volts to it since 2001...
  11. atvhead

    AC 3 phase electric motor

    yes, the motor is not operating "properly". Obviously, many other factors change with the operation of 575volts in the 460volt motor. If it is a VFD, which i believe it is, would it be possible at all to run 575volt in the 460volt motor and expect a motor base speed increase? thanks for the...
  12. atvhead

    AC 3 phase electric motor

    Hello all, I am new here and this is my first post. I did search through the postings as best I could to find an answer to my question, but no luck. My question is: in a constant speed AC 3 phase, is the voltage & motor RPM proportional? For example: if I have a 460v motor operating at...

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