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  1. morbark

    Software for an illustrated parts manual

    If you're using a 3D CAD pkg. you've got the information already. We're using SolidEdge...a great tool. It will explode drawings, allow you to change them, creat .jpg's, etc....great stuff. B
  2. morbark

    Rotational or Moment of Inertia Help

    To all....looks like, and I calculate (w/ everyone's help) we're looking at about 13k in-lbs. That's great, and will work well w/ our components! Many thanks to all.....you're all very smart.....& I'm VERY grateful! Regards, Bill
  3. morbark

    Rotational or Moment of Inertia Help

    pj...you're right! only thing is that 36 is the diameter, not the radius. So if you take 18 for "r"...I get 12577 in lbs. Only one more ? though...how do you go from multiplying (sl-in) X (rad/s^2) to get (in-lbs) for the resulting units? Bill
  4. morbark

    Rotational or Moment of Inertia Help

    Also...in calculating this, I get 1.62million in lbs for "I", and consequently 305million in lbs for torque at an acceleration of 188.5 rad/s/s. Geez this seems huge enough to not be real! Bill
  5. morbark

    Rotational or Moment of Inertia Help

    Prex...could you please expand on: "the peak acceleration will be higher, especially if you don't want to brake the mass and can't accept an overspeed". I don't need to brake it....and overspeed is not an issue. Why is this important? Thanks, Bill
  6. morbark

    Rotational or Moment of Inertia Help

    To all, I have a 10,000 lb mass that is about 36 inches in diameter that is going to have to be accelerated from rest to about 300 rpms in roughly 10 seconds. My question is...I guess I can figure it's "I" value (ie 1/2*m*r^2), but where does the acceleration of this body come into...
  7. morbark

    Weight Estimation

    MadMango is right...3D software, a density, and you've got it! They can be reasonably priced too.
  8. morbark

    1 Large Nut vs. 8 smaller ones

    The calc should be easy enough now that I will have the correct data. Though, there are still issues such as the one CoryPad presented w/ the tightening procedure. Sometimes things like this are almost impossible to direct for us. Our customers are going to do whatever's easiest. Thus, we...
  9. morbark

    1 Large Nut vs. 8 smaller ones

    Understood...and thanks. I just have never seen the relationship b/w hardness and UTS. Thanks again!
  10. morbark

    1 Large Nut vs. 8 smaller ones

    Metalguy, Could you please explain how to relate the hardness that I would find, with the UTS...(that I would then take 60% of to get the shear strength). Thanks
  11. morbark

    Tensile capacity/minimum engagement

    I think you're probably right. I doubt the rod is fully hardened through. We need the outside to be hardened b/c of its abusive environment. Also, the rod is actually 2 1/2" OD (furthering the arguement that it's not going to be 45RC all the way thru), and the bolt I'm proposing to use in...
  12. morbark

    1 Large Nut vs. 8 smaller ones

    Metalguy, Actually, I'm calc.ing that the 8 bolts will be weaker than the one big one. I'm using the equation in the other tread that you and I are chatting on "tensile capacity/min engagement", given by CoryPad. Maybe I'm missing something here, but I show the eight 1" bolts...
  13. morbark

    Tensile capacity/minimum engagement

    I'm using the UTS given by our material supplier. Maybe I should be including a 'fudge factor' into this number.
  14. morbark

    1 Large Nut vs. 8 smaller ones

    Thank you all for the help. The 'cross talk' would be an issue here b/c there will be a fair amount of disassembly and reassembly with this devise...it's rather high maintenance. Thus, one of the things we always try to incorporate into our designs is simplicity.
  15. morbark

    Tensile capacity/minimum engagement

    Just for clarification...shear strength, T, is AKA Yield Strength??? I have data on UTS, Tensile Yield, Bulk Modulus, & Shear Modulus...I'm getting confused. Which is the number I'm looking for?
  16. morbark

    1 Large Nut vs. 8 smaller ones

    Right...the nut is 8 1/8"...the 'flats' are at 12" b/c that's what we make them (we mfr. the wrench too). So yes, the shaft is a bit soft (32RC). But it's UTS is listed as 156k and it's yeild is listed as 138k...so it's pretty heavy duty stuff. And you're right on the rods...they're...
  17. morbark

    Tensile capacity/minimum engagement

    Yea...I know, but thanks for the reminder. It's a common problem here.
  18. morbark

    1 Large Nut vs. 8 smaller ones

    OK...I have a drive shaft intended to turn a grinding hammer mill. There are two plates on the shaft that that 'sandwich' rods that run between them. The ends of the rods are at the inside faces of the plates (the faces facing each other) and the plates are intended to squeeze together as much...
  19. morbark

    Tensile capacity/minimum engagement

    TVP...or square inches (for those of us still working in English units!). Thanks guys, I'll do another attempt and see if I can make more sense this time.
  20. morbark

    Tensile capacity/minimum engagement

    Corypad...could you please clarify the equation for A shear,nut. I'm wondering if the second half w/ (P/2 + (d-D2) etc etc is under the numerator of n*d*m...or what. Please help. I'm trying to use this equation to determine if a 8" dia nut w/ 1 3/4" of thread engagement is stonger...

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