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Old Jan 31, 2022 | 02:54 PM
  #4216  
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From: Portland, Or
Originally Posted by ViciousLSD
if you have a solid tire and the shock is mounted at the middle of the arms, sure. might you the sprung weight is only 225 lbs. quadrulple that and you still cant bend that threaded rod.
i think my 20 TON shop press can do it.
You just guessing here and you're wrong. The point is, these are within the realm of failure loads and fatigue life for what they are. Weather you like it or not, this is how engineering and math works.
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Old Jan 31, 2022 | 02:57 PM
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From: Houston
Originally Posted by Dallas J
Double check my work... I could have gotten something wrong.

Force is based on the fact I know I can close the 2" gap from tire to fender on a hard hit. So Im compressing a 1450 lb/in spring by 2*0.76 inches. Dimensions of the arm are from one of my cad models, distance to thread/body intersection guessed at 125mm.
so looking at that. i think youre saying the threaded section takes about 2x the force as the ball joint. is that enough to bend it tho? 1000 lbs vs threaded section....
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Old Jan 31, 2022 | 03:01 PM
  #4218  
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From: Houston
Originally Posted by Dallas J
You just guessing here and you're wrong.
*hypothetically speaking* not allowed in your class?

"math" is also theoretical IMO. We got rocket scientists screwing up rocket lauches ya know
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Old Jan 31, 2022 | 03:06 PM
  #4219  
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From: Portland, Or
Originally Posted by ViciousLSD
"math" is also theoretical IMO.
Nvm, go ahead and ignore math.
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Old Jan 31, 2022 | 03:11 PM
  #4220  
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Originally Posted by kaj
Funny: I started out as an engineering student. I think all of here are like minded in that way, which is why we are still here.
obviously, not me, lmao banking/finance/econ/capital markets whooooo
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Old Jan 31, 2022 | 03:13 PM
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From: Houston
Originally Posted by Dallas J
Nvm, go ahead and ignore math.
This has threads. 3000 lbs rating

https://www.lowes.com/pd/National-Ha...eel/1002234848
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Old Jan 31, 2022 | 03:15 PM
  #4222  
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From: Portland, Or
Originally Posted by ViciousLSD
Good lord, you have no clue what you're talking about.
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Old Jan 31, 2022 | 03:24 PM
  #4223  
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just condescending 'expert' comments. I'm still trying to figure out what the issue is, using math or experience with materials, your exact (math) numbers or hypotheticals. is it bending or stretching that youre concerned about?
just waiting on you to pick on my grammar next
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Old Jan 31, 2022 | 03:30 PM
  #4224  
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Its not condescending, I tried to explain, gave good real world numbers of an example, and you come back with but this chain link holds 3000lbs.

Apples and stick
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Old Jan 31, 2022 | 03:35 PM
  #4225  
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in any case, i like that the rear spindles give me independent toe adjustment now, so I'm not too concerned about basically adding extra camber
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Old Jan 31, 2022 | 03:36 PM
  #4226  
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From: Houston
Originally Posted by Dallas J
Its not condescending, I tried to explain, gave good real world numbers of an example, and you come back with but this chain link holds 3000lbs.

Apples and stick
you got fired up, ran the numbers, CAD... you could have just told me to use "5k" force on the the wheel, i would accept it lol, just get back the original topic. Can you bend a short threaded rod or not? run the numbers on that if you could please
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Old Jan 31, 2022 | 03:41 PM
  #4227  
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From: Portland, Or
Originally Posted by ViciousLSD
you got fired up, ran the numbers, CAD... you could have just told me to use "5k" force on the the wheel, i would accept it lol, just get back the original topic. Can you bend a short threaded rod or not? run the numbers on that if you could please
Thats the part you dont understand. The force alone isnt the whole picture. Its the moment, which requires knowing both force and geometry. That's why I drew a basic shear-moment diagram to explain.

And you're still picturing threads in tension/compression. These are in bending. Different world. How about you go find a race car with threads in bending.
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Old Jan 31, 2022 | 03:44 PM
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From: Houston
Originally Posted by kyoo
obviously, not me, lmao banking/finance/econ/capital markets whooooo
also math/numbers keep things looking "ok" .... then 2007 came
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Old Jan 31, 2022 | 03:54 PM
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From: Houston
Originally Posted by Dallas J
How about you go find a race car with threads in bending.
Those adjustable threads are everywhere and is used widely by individual/small team racers. professional teams wont use them because they manufacture their own parts to exact dimensions
so if youre going to design adjustable control arms, you would use adjustment holes and bolts then?
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Old Jan 31, 2022 | 04:01 PM
  #4230  
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From: Portland, Or
Originally Posted by ViciousLSD
Those adjustable threads are everywhere and is used widely by individual/small team racers. professional teams wont use them because they manufacture their own parts to exact dimensions
so if youre going to design adjustable control arms, you would use adjustment holes and bolts then?
Do you not comprehend the difference between tension/compression and bending?

Im going to go ahead and be done with this. The math is there for scrutiny, and its an industry standard to keep threads out of bending.
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