Re: Would You Use This Spindle?
[Re: BDW]
#2160566
09/24/16 12:12 AM
09/24/16 12:12 AM
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Joined: Jan 2003
Posts: 4,334 Morrow, OH
markz528
master
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master
Joined: Jan 2003
Posts: 4,334
Morrow, OH
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Stress risers......... You realize these are forged steel, not cast? yes
67 Coronet 500 9.610 @ 139.20 mph 67 Coronet 500 (street car) 14.82 @ 94 mph 69 GTX (clone) - build in progress......
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Re: Would You Use This Spindle?
[Re: jcc]
#2160917
09/24/16 03:52 PM
09/24/16 03:52 PM
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Joined: Jan 2004
Posts: 8,657 fredericksburg,va
cudaman1969
master
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master
Joined: Jan 2004
Posts: 8,657
fredericksburg,va
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Un Nope. I know the stresses are not great in that area, but that pitting is a great source for stress risers. Significantly increases the chances of cracking and breaking. I personally would not risk it. That's exactly what I was wondering about when I posted this. Grind them out then. Sorry, but we are starting down a path that could very well make this worse for the OP. It appeared to me, and not if addressed already, seems like the spindle has already had some mechanical surface de rust prep in posted pic. That was smart, and only improved matters. Going further with grind marks, causing minor localized heating, and/or grind marks orientation, etc, are a risk, and not worth it. Additionally any metal removal is hard to see as a plus. If there was one or two serious depressions, which I don't see, there would be the issue of concentrated stress riser. The fact that there are numerous rust cavities, actually spreads the stress out over a larger surface area, minimizing any single large stress concentration. As also already mentioned, I always coat the area shown pitted with grease, for this very reason, due, to exposure some how, by immersion, or condensation. Sarcasm is cool, no
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Re: Would You Use This Spindle?
[Re: Stanton]
#2161296
09/25/16 12:00 PM
09/25/16 12:00 PM
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Joined: Jan 2003
Posts: 10,943 North Dakota
6PakBee
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,943
North Dakota
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....the bearing doesn't spin on the spindle... It doesn't spin but it does move. As to stress risers, they are more of a concern with cyclical stresses. I'd run it.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: Would You Use This Spindle?
[Re: 6PakBee]
#2162095
09/26/16 03:49 PM
09/26/16 03:49 PM
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Joined: Jan 2003
Posts: 16,376
dogdays
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,376
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"stress risers"
Boy do we know the terms.
You actually think that someone who had the car before you de-rusted the spindle? Seriously? Even cars that sit in scrapyards have the hubs on, most of the time. How do the knuckles get rusty? And if you are in a scrapyard that has a rusty knuckle lying there, wouldn't you pass it by and get a different one? So this derusting talk is all nonsense to me.
Does it have original ball joints? Did the previous owner do all his own mechanic work? Because no shop worker is going to do anything more than clean with a rag and maybe some solvent before adding new grease and bearings and reassembling. Even in the 0.1% of the time that it's rusty. It just wouldn't happen. They're all trying to beat the flat rate, not that there's anything wrong with that.
Then add to that the fact that I've taken apart hubs and seen that exact surface texture, many times. Under the grease. My conclusion is that hundreds of millions of cars left Detroit with that same surface texture in that area.
Now on to how the member is stressed. The spindle is a cantilever beam and the maximum moment is at the root of the spindle, tapering off to zero at the point where the outer wheel bearing exerts a force on the spindle. If the vehicle is rolling straight the upper side of the member is in compression, which does not affect the "stress risers". It's only where the tire is trying to tuck under the car that there is a possibility of this area being in tension, and that tension is opposed by the weight of the car. So the amount of tensile stress in that area may be quite a bit less than imagined.
So what happens IF all the planets line up and the spindle fails? It bends. Yes, that would probably lock up the wheel, but in such an extreme case there would be warnings as the spindle bends through its elastic region before going into the plastic (yielding) region.
So I'd certainly use that spindle and not give it another thought. On my daughter's car.
R.
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Re: Would You Use This Spindle?
[Re: dogdays]
#2162178
09/26/16 05:51 PM
09/26/16 05:51 PM
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Joined: Dec 2003
Posts: 23,295 Here
jcc
If you can't dazzle em with diamonds..
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If you can't dazzle em with diamonds..
Joined: Dec 2003
Posts: 23,295
Here
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"Now on to how the member is stressed. The spindle is a cantilever beam and the maximum moment is at the root of the spindle, tapering off to zero at the point where the outer wheel bearing exerts a force on the spindle. If the vehicle is rolling straight the upper side of the member is in compression, which does not affect the "stress risers". It's only where the tire is trying to tuck under the car that there is a possibility of this area being in tension, and that tension is opposed by the weight of the car. So the amount of tensile stress in that area may be quite a bit less than imagined." That tuck under you mention, in a high performance application can occur under braking, in a high g turn, and depending on other suspension variables, could be 70%? of the weight of the car, and then add the potential dynamics of bumps, etc, I think the loads can be higher then imagined. Failure will likely be at a point of maximum stress, not over time, when subject to only the rolling weight of the car you brought up. Are we also assuming all the rust the OP is asking about is only on the upper surface pictured that under ideal normal conditions as you described iis n compression, and not underneath? We are also assuming, I believe safely, the COG on the car is above the centerline of the spindle, and therefore the "tuck under" mention helps to reverse load the spindle. Bottom line ANY surface irregularity is a potential stress riser, all should be avoided, the consensus here so far, which I agree with, in the OP's case, its an insignificant stress riser. Why are beating this to death again?
" All sorts of things can happen when you are open to new Ideas" Inventor of Kevlar
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