![]() | Home > Technical > Puma rear axle casing negative camber - factory tolerance? |
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ickle Member Since: 22 Jul 2010 Location: South Vendee Posts: 1462 ![]() ![]() ![]() |
'It is on the face of it a bizarre specification, proportionally the same as defining a linear measurement to be 1/4 of an inch, plus or minus 1 inch.'
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BogMonster Member Since: 05 Feb 2008 Location: Stanley Posts: 313 ![]() ![]() ![]() |
It should be straight but given that the factory can't build anything straight and haven't been able to for the last 70 odd years, 6mm is probably pretty good |
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blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 12466 ![]() ![]() ![]() |
I missed the cross-camber figure. You could certainly have an axle that met the spec in the table but looked extremely odd! They are very strange figures, for sure.
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Shroppy Member Since: 25 Feb 2016 Location: Shropshire Posts: 376 ![]() ![]() ![]() |
I dare say based on those values that the end flanges are pre-machined and then welded up in a jig but could be wrong. Not sure how you'd manage that with the diff mating face though given the thickness of it. It's a strange design really.
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Dinnu Member Since: 24 Dec 2019 Location: Lija Posts: 423 ![]() ![]() ![]() |
I would not be surprised if there is no further machining at all after the welding process.
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Shroppy Member Since: 25 Feb 2016 Location: Shropshire Posts: 376 ![]() ![]() ![]() |
Earlier axles are certainly friction welded in my experience, I think the issue with the mating flanges snapping off is limited to the more conventionally welded axles?
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Dinnu Member Since: 24 Dec 2019 Location: Lija Posts: 423 ![]() ![]() ![]() |
Never owned or worked on a 110, so my experience stops on a 90.
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Shroppy Member Since: 25 Feb 2016 Location: Shropshire Posts: 376 ![]() ![]() ![]() |
So this evening I bolted the diff in place and dropped in a halfshaft. With the halfshaft vertical and the O/S mating flange on a level surface it was evident that the long side was at fault.
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Shroppy Member Since: 25 Feb 2016 Location: Shropshire Posts: 376 ![]() ![]() ![]() |
An interesting read; https://www.boconline.co.uk/en/images/Fund...113398.pdf
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Dinnu Member Since: 24 Dec 2019 Location: Lija Posts: 423 ![]() ![]() ![]() |
Good find there.
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Dinnu Member Since: 24 Dec 2019 Location: Lija Posts: 423 ![]() ![]() ![]() |
Something like this:
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Shroppy Member Since: 25 Feb 2016 Location: Shropshire Posts: 376 ![]() ![]() ![]() |
Yes, whilst I have a good theoretical knowledge of the properties and behaviour of steel as a civil (structural) engineer, my practical experience is lacking somewhat other than that gained through welding. The article gives optimal temp. values for heat straightening based on the material properties and makes reference to watching the heat affected zone. Something I don't think I'd be comfortable attempting without the supervision of someone more skilled in this area.
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Dinnu Member Since: 24 Dec 2019 Location: Lija Posts: 423 ![]() ![]() ![]() |
The problem with welding approach is that you have less control than if it was heating with a torch.
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Dinnu Member Since: 24 Dec 2019 Location: Lija Posts: 423 ![]() ![]() ![]() |
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