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  #11  
Old 10-12-2016, 01:27 PM
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Terry C Terry C is offline
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Quote:
Originally Posted by Sam Mac View Post
Looks like the outer bearing is supported on the extension that you machined and that is only supported by a 1/2" bolt. Let me know how that works.
Only hope is that at least part of the outer bearing rides on the axle.
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  #12  
Old 10-13-2016, 07:06 AM
twoton twoton is offline
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mrjeep81, for your reference;

According to Fastenal’s Technical Reference Guide s7028 ;

https://www.fastenal.com/content/doc...renceGuide.pdf


From page 2;

Figure 2 Shear Planes in a Bolted Joint

“When no shear strength is given for common carbon steels with hardness up to 40 HRC, 60 % of their ultimate tensile strength is often used once given a suitable safety factor. This should only be used as an estimation.”

And from page A-1,

Ungraded, low carbon steel bolts in the size range from ¼” – 1 ½” have a minimum tensile strength of 60,000 lbs per square inch. Jumping up to a grade 8 , Medium carbon alloy steel: quenched & tempered, same size range bumps those numbers up to minimum 150,000 psi.


So, 60% of the lowest strength listed (60,000psi), gives us 36,000psi, with the cross sectional area of a half inch bolt at 0.19625 inches. That's 7,065lb shear strength. That’s minimum, lowest grade bolt, per spindle extension, only providing partial support to the outside bearing. Even if you reduce that by 50% as a safety factor, it looks like you’re good!
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  #13  
Old 10-13-2016, 09:24 AM
J-Mech J-Mech is offline
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twoton: So.... if I cast a giant weight that weighs 3500#. Then brought in a crane and picked it up 7' off the ground and used a 1/2" bolt (on a side load) to hold it up... would you stand under it? Keep in mind it is only 1/2 of the rated side load (shear strength) of the bolt. It should be completely safe right?
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  #14  
Old 10-13-2016, 11:07 AM
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If the extension that he machined is firmly in contact with the existing axle I would agree with the shear being the determining factor, but if there is a space between the extension and the factory axle now we are talking about bending moment. Also keep in mind the offset of the wheels. I'm not trying to be negative about this, just trying to help.
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  #15  
Old 10-13-2016, 01:26 PM
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I appreciate the banter, and assure you there are many ways to skin the proverbial cat. My choices for completion at the least will include grade 8 fastners, (those compeled to look up shear and or tensile strength please feel free)[ I personally use the Machinery Handbook], or welding, (with the previously mentioned UNHOOKED welder, so that's a while out also) the extensions to the axle and replacing the hex with a stud/washer/lock nut to set and hold bearing preload. As also stated earlier, I will be moving to the new house and will not be set up for frame modifcation anytime soon. So it will be some time before I provide fodder for further "disc-ution".
Differences, and ideas, are what make groups like this a good place to teach AND learn.
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  #16  
Old 10-14-2016, 06:01 AM
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I know all that scientific crap that you guys just blurted out was a foreign language to me! WOW!

I like your idea so far - interested to see what the end result will be. I like the wide tire/rim set up you have, as long as the rest of the tractor is proportioned correctly - they will look slick on it!! Good job! Let your creative mind go wild. I wish I had the tools to allow me to "build" things like this. I have WAY too many ideas for the time and money to execute them!

Boy I'd love to get my hands on that 2072 frame you have with ps, that would be a GREAT starting point for a lot of ideas!



Can't wait for more updates and pictures.
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  #17  
Old 10-14-2016, 10:11 AM
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Quote:
Originally Posted by mrjeep81 View Post
So it will be some time before I provide fodder for further "disc-ution".
Differences, and ideas, are what make groups like this a good place to teach AND learn.
Sub'd, if for nothing more than this statement. At times I've felt a bit south because of how many great ideas that have been shared here that I've stolen for my tractor. But that goes to show just how creative and skilled our members are.

Very excited to see how this plays out. Good luck with the move and congrats on the new home.
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  #18  
Old 06-01-2017, 08:45 PM
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At least its a start.
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  #19  
Old 06-06-2017, 06:25 PM
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Bits & pieces. My grandson says I'm playing like he does with his Legos. Guess he's kinda right.
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  #20  
Old 06-06-2017, 10:25 PM
V30crewcab V30crewcab is offline
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as long as you're having fun who cares right?
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