Even if it were Extra Heavy Duty, I would not install 10-spline crap in a 5,ooolb truck with a locker. That's just dumb.
The 10-spline stuff has a deeper spline cut. This reduced the diameter of the axle at the spline. The stock 10-spline stuff does not break at the spline because the entire axle is crap. Although the spline area is technically "weakest" area of the shaft, it pnly breaks there sometimes because the rest of the shaft is crap, too.
Stock 24-spline axles are crap, too. The metal sucks and it's unpredictable as to where they will break. I've broken many 24-spline axles shafts, both front and rear. Here are a few:
You can see that this axle broke at the splines:
Here is an axle that broke just in front of the axle seal:
Here is another that broke at the hub:
The metal, as you can see, is shit. We know the metal is shit because of the clean breaks. look at the break on one of my axles:
You could not cut an axle in half any better. Good metal will shatter and splinter. The edges would be all jagged and sharp. The stock Rover axles are junk.
Now when you get into some "HD" type axles, it's a different story. Just like a chain, the HD axle will break at its weakest link.
This picture explains a lot:
As you can see in the pic above, you want the main shaft to be the "thinnest" part of the axle. This allows the axle to twist and flex and distribute the abuse across the length of the shaft. Instead of just breaking, the axle will twist before breaking.
But what happens is when you cut only 10 splines into an axle, the cuts are deeper, thus reducing the axle diameter. 24 splines are not cut as deep. 30 splines are shallower yet. So, the more splines you have, the more "meat" that is left on the axle.
When the smallest diameter of the axle is the spline area, the spline will twist before the axle shaft does. Or, once the axle shaft has reached its maximum allowable rotation, the spline will then begin to twist. you want the axle shaft to twist before the splines do as the axles shaft and twist a hell of a lot more than the splines can:
I've seen a few Rovertracks HD axle failures. Everyone was broken at the splines because of the axle design....the root of the splines is smaller than the actual shaft of the axle. On the Rovertracks design, the shaft is not allowed to rotate and twist - they just snap at the weakest link.
Comparing a stock 10 spline to a stock 24 spline is like comparing a Big Blue coil spring to a Bearmach coil spring.....you never had shit to start with. The real test would be to compare an "HD" 10 spline to a "HD" 24 spline. Even then the test is flawed as you cannot reproduce the mystery shit that goes on with momentums, etc.... But just like the Bobby Longfield 27 spline vs 30 spline axle test, the higher spline will still prove to be stronger.
So, the real question is, is Ian a fucking dip shit moron? The answer is yes, and here is why:
The axle spines are very important for axle strength. But I'm sure Ian was dispute this. So lets look at it.
Axle spines have two parts, Major Diameter and Minor Diameter. Here's a pic to help visualize:
We don't need to get into the shape of the splines, the pressure angle, or the diametrical pitch as Ian is too stupid to understand all that.
As illustrated in the diagram above, the major diameter is the diameter of the splined section of the shaft measured at the outside or tips of the teeth of the splines. The diameter of the shaft at the bottom of the grooves between the teeth is the minor diameter of the splines.
Look at the difference between a 10 and 24 spline. Although one ale appears to be a Rovertracks type axle, you can still see the difference in splines.
Starting to see why more splines the better? I bet Ian does not...
Now look at the profile of the axle spline cuts. The 10 spline is square, whereas the 24 spline is involute. Here's what I'm talking about
:
Involute splines have teeth with a profile as shown in the above pic where the tip is narrower than the base. Involute splines have 3 distinct advantages over square cut:
* Involute spline couplings have greater torque-transmitting capacity than any other type
* Involute splines can be produced using the same techniques and equipment as is used to cut gears; and
* Involute splines have a self-centering action under load even when there is backlash between mating members
Square cut splines are quite old-fashioned and are rarely used anymore.
But anyway, I'm bored now. Ian is an idiot.
References:
"Machinery's Handbook" 24th Edition. Erik Oberg, Franklin D. Jones, Holbrook L. Horton, Henry H. Ryffel, Robert E. Green; Industrial Press Inc., 1992 p.475
"Engineer to Win". Carroll Smith; Motorbooks International, 1985 p.115
"Engineer to Win". Carroll Smith; Motorbooks International, 1985 p.119
"Machinery's Handbook" 24th Edition. Erik Oberg, Franklin D. Jones, Holbrook L. Horton, Henry H. Ryffel, Robert E. Green; Industrial Press Inc., 1992 p.2034
"Machinery's Handbook" 24th Edition. Erik Oberg, Franklin D. Jones, Holbrook L. Horton, Henry H. Ryffel, Robert E. Green; Industrial Press Inc., 1992 p.265
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