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Recent content by michaelb7

  1. michaelb7

    60034-14 "Machines mounted in situ"

    The scope of this standard says "This standard is not applicable to machines mounted in situ". Does anyone know what this means? My motor is mounted to a gearbox by a flange, does that mean this standard wouldn't apply to it?
  2. michaelb7

    Flat Heads and UG-34

    I've used the following formulas in the past: Mx = (p/16)[(d2/4)(1+µ)-(r2)(3+µ)] Mz = (p/16)[(d2/4)(1+µ)-(r2)(1+3µ)] From Process Equipment Design: Vessel Design, p102 eq 6.50 and 6.51 σx = 6Mx/t2 σz = 6Mz/t2 From Process Equipment Design: Vessel Design, p102 eq 6.55 Plug in the...
  3. michaelb7

    Camshaft Design Torque

    @tubelna Cam doctor looks like an interesting device. I don't need to physical measure anything since I have a 3D model. Ideally there would be some program where I could drop the cam profile in, and it would spit out the pressure angle and radii in one degree increments, that would be good...
  4. michaelb7

    Camshaft Design Torque

    Ok last post on this topic. I convinced myself that the book's equation was correct, they just drew the diagram differently. Thanks for the help all!
  5. michaelb7

    Camshaft Design Torque

    @dvd Equations 12 and 13 in section G helped. When I combined those two equations I get the exact same equation I thought it would be. My only complaint is I don't agree how they draw r in Fig G-1. I figured r would be defined as the distance starting at the center of the cam, and drawn...
  6. michaelb7

    Camshaft Design Torque

    @MintJulep I didn't say it couldn't be done without a computer, it would just be very time consuming. I have a BSME from a good University and I don't remember any time being spent on cam design, so forgive my ignorance. My question was just a conceptual question to see if that particular...
  7. michaelb7

    Camshaft Design Torque

    thread404-121103 I'm trying to find the torque to drive an existing cam (the calculations were lost ages ago). I think I'm going to recommend that we buy some software for it, because it seems like the calculation that Zekeman did would have to be repeated MANY times around the surface of the...
  8. michaelb7

    Gearbox Power Rating

    I called the manufacturer, I talked to a couple of people who seemed to know less than I did. It sounds like you agree with my calculation above so I will go with a 1.5 hp box. It's not a huge cost difference and I'd rather be safe than sorry.
  9. michaelb7

    Gearbox Power Rating

    The problem is that I'm not slowing the motor down. Instead of using a 3/4 hp motor rated at 1750 rpm, I'm using a different 3/4 hp motor rated at 1000 rpm. I feel like I should be using a gearbox rated for (3/4)(1750)/(1000)= 1.31 hp. I'd round this up to a gearbox rated for 1.5 hp. Not sure...
  10. michaelb7

    Gearbox Power Rating

    Does the horsepower rating of a gearbox depend on the input speed from the motor? Most catalogs seem to have the ratings based on an input speed of 1750 rpm. I'm driving my gearbox with a 1000 rpm motor. My gearbox is rated for 3/4 hp and I'm driving it with a 3/4 hp motor. I'm concerned that...
  11. michaelb7

    NEC 505 and Explosion Proof

    I have a motor http://www.eng-tips.com/that has a rating as Class 1, Zone 2, IIC, T3. I've read through NEC 500 and 505. I see the definitions of "Explosion Proof" in 500.02. I see the definitions of the Class, Zone, Material Group, and temperature designation in various sections of NEC 505...
  12. michaelb7

    Find Tensile Stress in Anchor Bolts

    I was able to solve my simplified version (this will be my last post, I just want to wrap things up). I'd like to do 3 things: 1)Show the method of my solution 2)State how I would apply this to my real life problem 3)Show weaknesses of this method 1) The key was to write the plane equation in...
  13. michaelb7

    Find Tensile Stress in Anchor Bolts

    JLNJ, Believe it or not, that was the first thing I attempted! It didn't seem like the proper thing to do since I figured it was a statically indeterminate problem. Do you think that method would give a conservative result?
  14. michaelb7

    Find Tensile Stress in Anchor Bolts

    Thanks Ron. I'm going to have to read through that and chew on it a while.
  15. michaelb7

    Find Tensile Stress in Anchor Bolts

    I've attached a picture of what I'm actually trying to size the bolts for. This diagram is showing the worst case loads and moments at each flange face. There will be bolts in the holes on the baseplate. I agree that I should probably find a simpler way to do this. JStephen/Ron, I'm trying to...
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