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Author: Subject: cross section of a grp4 axle?
blakep82

posted on 1/11/07 at 08:42 PM Reply With Quote
cross section of a grp4 axle?

has anyone got a cross section picture or a grp 4 fully floating axle?

just need to check what i'm doing on mine is right. I've got some of the parts, but have to admit i don't completely know how they work





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Confused but excited.

posted on 1/11/07 at 10:02 PM Reply With Quote
Doubtful. They usually sink.





Tell them about the bent treacle edges!

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24vseven

posted on 1/11/07 at 10:13 PM Reply With Quote
i dont have any pics to hand but if you show me yours (oh er) i can tell you if it looks right if it helps
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blakep82

posted on 1/11/07 at 11:18 PM Reply With Quote
i've seen them before like this so i reckon it's right, but can't exactly work out where the bearings go, where the hubs sit, where the drive saft comes out etc.

also why is it called fully floating?



[Edited on 1/11/07 by blakep82]





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24vseven

posted on 1/11/07 at 11:31 PM Reply With Quote
looks good to me the hub sits on the end of the shiny bit (the hub carrier) the hub has the studs attatche to this they bolt through from the back this sits on two bearings like a conventional fwd hub this is located with a locking ring the driveshaft then has a flange on one end with 4 holes to match the studs this then slides throghu the hub and locates on the wheel studs its called fully floating as the halfshaft isnt retaned by any bearings ect just the road wheel hope this helps
i cant take pictures of mine at the mo as its away for resetting the diff aftr the halfshaft and diff fell out with each other
soon as its back i will take a pic if you want

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blakep82

posted on 1/11/07 at 11:44 PM Reply With Quote
nice one! cheers for that! so, semi floating axles are called that because the halfshaft in located in the diff by the side gear (not on its own bearing) and and at the end of the tube by the bearing

fully floating has no bearings on the actual halfshaft?

is that right?

i think i get it now, so the bearings go on the outside of the shiny bit on the end, and the hub sits over that?

is it possible for the wheels to go on the axle and be strong enough to stand, push around, and say for instance (i won't do it though...) push it down the hill without everything falling apart?

I've spent ages checking and rechecking everything is perfectly straight before welding, but how exact does it need to be? i worry that maybe the heat of welding may have affected it





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24vseven

posted on 2/11/07 at 12:18 AM Reply With Quote
yes it can stand on the hub without the halfshaft its how it is anyway the halfshat dose nothin but transmit drive in fully floter it dosent carry any weight as for
accurecy it needs to be fairly close am afraid

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blakep82

posted on 2/11/07 at 12:34 AM Reply With Quote
excellent news! I'll get on and order the hubs and bearings etc. i just hadn't done it yet as i thought i wouldn't be able to do anything with them without the half shafts.

i sure it is straight, i made a thing for checking

code:

/==\
___/ \____



sort of a shape, which i checked regularly against a piece of box section, and against the original axle. i did check it after i started welding (and many times before) and there was a tiny tiny gap showing on one side. couldn't have been more than 0.05 deg (in fact half a degree is quite a lot, so no where near, the gap was basically you could see a bit of light)

thank you VERY much for your help again 24seven

[Edited on 2/11/07 by blakep82]





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MikeRJ

posted on 2/11/07 at 09:00 AM Reply With Quote
A semi-floating axle has the driveshafts and drive flange made in one piece, so the shaft does double duty in transmitting the drive torque and also supporting the weight of the vehicle on that corner. This puts the axle under some bending and shear forces where it is supported by the bearings.

In a fully floating axle the drive shaft is splined at both ends, and the hub/drive flange is a separate part which is supported on larger bearings at the ends of the axle. The drive shaft is purely to transmit torque to the wheels, it experiences no bending or shear forces.

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