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  1. downwash

    heat treat vs strength

    thanks much
  2. downwash

    heat treat vs strength

    so if i understand corectly to increase its srength, yeild, fatiuge it will need to be heated to appropriot temp quench "oil quench"? drawn or drawn twice just like 01 type tool steel but at diffrent temps thanks again
  3. downwash

    heat treat vs strength

    thanks CoryPad the part in question would be a feathering spindle for a helicopter. i think 4140 would be the best but im not sure thanks again
  4. downwash

    heat treat vs strength

    does the heat treatment of steel increase its elestic limit,ultimate strength, endurance limit? im mainly curious about bending loads. thanks
  5. downwash

    bench grinder motor burns when shaft is vertical

    "a current sensitive relay" uses gravity to open curcuit you are 100% correct we discovred this today, exactly what you said. i mounted the relay rite side up within the frame. no shudder no smoke altough i think the motor is already dammaged from running the wrong way i say this because the...
  6. downwash

    bench grinder motor burns when shaft is vertical

    its the most expessive one 180$ we use identical ones that run for full shifts for years. the only diffrance is this one is to be mounted verticly. i have a hard time beleving that thrust induced drag is the problem
  7. downwash

    bench grinder motor burns when shaft is vertical

    the motor burns up in about an hour probably less. there is no ventalation blockage caused by position. the original bearing arangement didnt apear to allow for any accurate axial shaft allignment, meaning the shaft could float if pushed because bearings are mounted between wave washers, with...
  8. downwash

    bench grinder motor burns when shaft is vertical

    i would expect they are radial contact made to support no axial load. witch in my case they are needed to support the axial load of the hub assembly. the bearings are mounted between wave type washers meaning the shaft has some axial yeild
  9. downwash

    bench grinder motor burns when shaft is vertical

    i am building a machine witch has a bench grinder motor mounted verticly because its most practical for the apllication. the first motor ran and smoked and died. it was replaced the new motor makes noise and starts to burn i shut it off. i then put it on the bench it ran fine i picked it up...
  10. downwash

    sline type for spiral bevel

    what type of spline would be most apropriot for a spiral bevel pinnion? strait sided? involute major dia fit? involute side fit? pressure angle?
  11. downwash

    spline type for spiral bevel

    what type of spline would be most appropriot for a spiral bevel pinnion? strait sided, involute major dia fit, involute side fit? pressure angle? thanks
  12. downwash

    measure dovetail

    if you are not good with formulas . it would be easyiest to draw on cad with whatever pins suit. get a dimension and measure. the female dovetal should be measured with gauge blocks between pins
  13. downwash

    twisting rotorblades

    i plan to build rotorblades by machineing a main spar and have a ribbed tail section.how to twist? my original plan was to twist the billets befor machineing and let them return to there natral state. but i beleive this would be difficult to yeild reliable results. can they be made strait and...
  14. downwash

    thrust and drag software for rotors

    i also couldnt get it working
  15. downwash

    thrust and drag software for rotors

    does any one know or any simple software or programs that can give total rotor thrust and rotational drag resultant for given rotor dimentions

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