1996 Mr.Pink

[Money pit Beretta]

Milling lines have not changed. Did it always have that light area? Almost looks like uneven heating on the right side.

[3X00-Modified]

The heat marks are there on both sides... I'm assuming those are there from the spline pressing process... There is no heat transferred to the axle like that during operation. As far as rotational mill lines, I wouldnt see those as changing because the twist is happening in the same direction as they are running so you wouldn't see it in them. I was referring to the dark horizontal lines. I also do not know if that light area was always there... This is a part that is normally inside the boot and since I did not assemble these I didn't see that before it went together.

I will compare all these marks to the 96 axle I pulled from my black parts car and see if find any indication that this shaft is twisting quite a bit or distorting.

[3X00-Modified]

Verified with a machinist here, he looked at it and feels the same way as I do... That shaft is twisted on the outer CV side as well. The heat marks are from a case hardening procedure for the splines.

[Money pit Beretta]

I see, was thinking the whole thing was case hardened at the same time. Ok so it's shaft milled and hardened,then the splines are cut and hardened.
That was a very good photo so the dark lines were easy to see. Got a nice look at just about everything on that shaft.
Guess it's more of a "deep" twist then? In that way the horizontal would not change. Oh it's been so many years.....have not had to think about this for a long time, kind of miss it.

Would the light spot be just from boot rub?

[Asylum]

There is something really wrong there Jon.

Yes, you are likely making tons of power, but not enough to create that on a first pass, off the line.

Holy Heck!!

But then I broke an axle on a burnout on a cold day, FWIW.

Maybe just the wrong damn angle at the wrong second. Who knows??

[3X00-Modified]

The other side of the shaft was twisted... I think this is the same axle shaft that has been in my car since 09, at least that would explain the extreme abuse on it seeing how I've only been to the strip once and broke it right away.



Shaft from my 96 parts car was a match so I made the axle tonight and installed it.

[woody90gtz]

I don't think angle would have much of anything to do with a bar shearing. CVs yes...bar no. Definitely looks like it's twisted. And repeated abuse would seem to make the most sense rather that one shock load. Especially with an auto.

[Cliff8928]

Agreed that this happened over time. All of my failures were usually from a shock load and the joint failed. The only time I had a shaft issue is when one wasn't assembled right.

[Money pit Beretta]

Liking the taper on the 96 shaft, that would help spread the stress and help it move into a thicker stronger part of the shaft.

[3X00-Modified]

Yeah it's definitely a better looking taper that's for sure.

[ifixalot]

Just FYI, "rotational milling" is called turning and done on a lathe.
Although today they do have CNC lathes that can do milling after turning is done.
But on a simple axle, it is most likely turned on a lathe.

[3X00-Modified]

Sorry I used the wrong term... I meant to write machine lines but my mind was somewhere else.

[ifixalot]

I've used the wrong term many times too, it's nothing to be sorry about.
As a machinist and hearing that said, it just seemed wrong not to say something.
I'm glad you had parts to quickly make up another axle.

[Money pit Beretta]

Some of us are getting older and forget the right terms(sad but true). Last time I worked with a metal lathe was over twenty years ago.

Sure looks like the first shaft was one of those "we can make one just like the stock" kind of things. Again missing a key point of why it works and getting into the what should not be done. But as we all know it's about making money and what is this "doing it right the first time thing?", don't make as much money doing that. Oops......rant or part of one. Stopping.

Still wonder if there is extra stress do to the large rotors vs stock.

[3X00-Modified]

The weight difference between stock and my Nbody rotors are so little I doubt that has anything to do with it... I'm sure it's from the slicks and large hp increase.