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Unread 04-10-2003, 10:33 AM   #1
Roughneck
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What is spline count?

Hi, I think I have a pretty good handle on most things mechanical. But I've never been able to figure out why higher splined axles are stronger.

Aren't they just more grooves cut into the axle shaft, and wouldn't that make the grooves smaller and just easier to strip out & spin?

Start with the basics if you don't mind. Splines are the inner end of the axle, correct?

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Unread 04-10-2003, 11:56 AM   #2
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I'll tell you what gator told me. If you look at some of the portal axles on unimogs, they look like they are 4 spline, big cuts into them. So the more cuts you have, the smaller the notches, but the less you have to cut into the axle. So the splines arent as 'tall' and harder to break. make sense? probably not
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Unread 04-10-2003, 12:36 PM   #3
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I have been wondering the same thing. I guess I need a demo in person. Thats beginning to help but no completely. Roughneck, did you get it?

Thanks Quan!
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Unread 04-10-2003, 04:20 PM   #4
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This may be something I will have to take on faith. If you make more splines, they have to get smaller and shallower, at some point they will just round off and let the axle spin, right?
Is there some number of splines that you can't go over?
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Unread 04-11-2003, 03:01 PM   #5
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also remember, the more splines you have the more surface contact and you're dividing out forces more.

The number of splines you can have is gonna correlate to shaft diameter as well. You can build a Ford 9" to have 40-spline shafts, thats about the highest count i'm aware of.

-Rob
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Unread 04-11-2003, 09:36 PM   #6
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i think theres a company making 43 or 35 spline..but not sure
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Unread 04-11-2003, 09:56 PM   #7
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RodeoRob hit it on the head - it's all about more surface contact - the same thing is true about bolts - the fine threads can handle significantly more torque than a bolt of the same size & grade in a coarse thread.
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Last edited by OldJeepguy; 04-12-2003 at 07:40 AM..
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Unread 04-18-2003, 01:24 PM   #8
Mels95YJ
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Quote:
Originally posted by OldJeepguy
the same thing is true about bolts - the fine threads can handle significantly more torque than a bolt of the same size & grade in a coarse thread.
I never knew that! I guess you can teach old dogs new tricks.

Mel
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Unread 04-19-2003, 02:43 AM   #9
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Quote:
Originally posted by RodeoRob
also remember, the more splines you have the more surface contact and you're dividing out forces more.

The number of splines you can have is gonna correlate to shaft diameter as well. You can build a Ford 9" to have 40-spline shafts, thats about the highest count i'm aware of.

-Rob
40 is the most splines you can get for any axle at this point.we all know how fast that changes. what rob said + the more splines you have, the bigger the shaft has to be to accomodate all of those splines.
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Unread 04-19-2003, 02:45 AM   #10
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Quote:
Originally posted by Quan


I'll tell you what gator told me. If you look at some of the portal axles on unimogs, they look like they are 4 spline, big cuts into them. So the more cuts you have, the smaller the notches, but the less you have to cut into the axle. So the splines arent as 'tall' and harder to break. make sense? probably not

i don't have spiders in my rearend...
i got rid if those when i did my axle swap. spools rule!
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Unread 04-22-2003, 07:10 AM   #11
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OK, can someone tell me the difference between spider gears and spools.
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