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  • Users: johnfin1
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  1. johnfin1

    Lifting using chain

    Those hoist rings are awesome but 4 of them cost more then my engine. Here it is coming out with 4 head bolts.
  2. johnfin1

    Lifting using chain

    No other holes, thats the problem. I have been told that if I use the tilter with those 4) 3/8 extended bolts they would shear off when I tilt the engine. I doubt it but not 100% sure.
  3. johnfin1

    Lifting using chain

    I was thinking of using 4) 3/8 intake bolts 1/2-3/4 engagement, would be closer to a vertical lift. Now instead of using the chain against the intake can I use long bolts (2-3" up out of the casting), grade 8 with grade 8 washers? I pulled the engine with the heads off this way using the head...
  4. johnfin1

    Lifting using chain

    I need to lift an engine/trans (800lbs) and because of the design I need to lift it using chain against a casting (heads). Is this a bad idea? (See attachment)
  5. johnfin1

    Bolt thread loading

    I am talking about stripping strength not bolt strength. Look at page 4. So what do you mean desertfox when you say threads are stronger? http://www.fastenal.com/content/feds/pdf/Article%20-%20Screw%20Threads%20Design.pdf
  6. johnfin1

    Bolt thread loading

    I thought course threads had a higher pull out in shear then fine threads but according to this fine threads are stronger. What is the truth? http://www.tapmatic.com/tech_manual/drill_depth.html
  7. johnfin1

    Air pressure

    Load is not the answer. Look at the tire pressure of a riding lawn mower, mine is around 10psi per time(x 4 = 40, my 10 speed is 65psi x 2). What is heavier a bike or mower.
  8. johnfin1

    Air pressure

    Is the pressure higher in a bicycle tire then a car tire because the volume/area is less in the bike tire. P=F/A higher the area the less the pressure, right?
  9. johnfin1

    Bolt thread loading

    How come when the bolt size goes down the clamping force goes up?? http://www.engineersedge.com/calculators/torque_calc.htm
  10. johnfin1

    Bolt thread loading

    I take it the /6 is the safety factor, right?
  11. johnfin1

    Bolt thread loading

    Drawoh, what is the 3/2 exponent in that formula. Cant seem to get 52lbs out of that.
  12. johnfin1

    Bolt thread loading

    Exactly what I have been saying, the tensile strength x the tensile = pull out strength which does not come close to the chart. This formula from Fastenal Corp is confusing and seems way off. The shear area (Ats)seems like it is 10x off Internal Thread Strength Formula F = Su * Ats Su = shear...
  13. johnfin1

    Bolt thread loading

    If I use this calculator and the machinerys hand book the 1/4-20 is only good for 114lbs http://www.fastenal.com/web/services.ex?action=FEDS&calculator=Load Their(Fastenal) cross section area (Ats) differs from the Machinerys handbook (tensile strength area). ....""Thread Stength Two...
  14. johnfin1

    Bolt thread loading

    Ahh, the math. I understand now. Got a copy of the book at the library, 23rd addition, 2 feet thick. I calculated 8700 not 6000 for a 1/4-20 bolt, goes up higher for fine thread, not sure why, thought course had a higher rating. Found the following formula and put it into mathcad. See...
  15. johnfin1

    Bolt thread loading

    I can see what the chart says, how do you get 160 lbs from a shear strength of 6000ksi.
  16. johnfin1

    Bolt thread loading

    First of all its only in grade 2 UNF and second it would be nice to learn something and see how those numbers are calculated. Kind of a cross check too, dont believe every chart I read on the internet.
  17. johnfin1

    Bolt thread loading

    Mike, I did some threaded bolt calcs using the shear area of the bolt and such and came up with around 6k psi for the threads to shear. Are you saying that I can use around 17:1 to figure out what the bolt could safely lift or is there a more acurate way to figure that out?
  18. johnfin1

    Bolt thread loading

    The first chart says (lbs) for load as in you can lift something with a threaded bolt into the load, straight lift using a 1/4 bolt and the load weight of 160lbs. So if the the thread shear calcs say are at 6000 psi, what does that equate to in a dead lift. I am confused here.
  19. johnfin1

    Bolt thread loading

    I was looking at this chart and I dont understand why the numbers are different. Says the working load for a 1/4 unf bolt is 160 lbs (tensile) yet underneath on the lower chart is says 2700 for the same bolt. http://dodgeram.org/tech/specs/bolts/SAE_bolt_strength.html

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