mangogrooveworkshop
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| posted on 16/12/09 at 04:54 PM |
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Nice wish bones in Ali.......
Just seen this bec with some nice bones
http://www.pistonheads.com./sales/1168507.htm
[Edited on 16-12-09 by mangogrooveworkshop]
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blakep82
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| posted on 16/12/09 at 04:57 PM |
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hmm, someone on here wanted to make ali wish bones yesterday, and we all said it was a bad idea. this makes a interesting twist on things... maybe its
not as bad as we thought then
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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Nash
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| posted on 16/12/09 at 04:58 PM |
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Pretty but try getting those through an IVA with those edges!
It's What You Do Next That Counts.
Build It, Buy It, Drive It:
Southern Kit Car Club
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02GF74
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| posted on 16/12/09 at 05:01 PM |
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yeah but notice: "Only one other for sale in the UK. Six years in the making. "
doesn't look registered or used for that matter so not much testing could have been done on it.
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Howlor
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| posted on 16/12/09 at 05:01 PM |
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quote:
Originally posted by Nash
Pretty but try getting those through an IVA with those edges!
With a bumper bar you should be fine I would have thought.
Steve
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Bluemoon
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| posted on 16/12/09 at 05:02 PM |
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Nothing wrong with making them that way but you need to know how to engineer them properly to stop fatigue being an issue, not really a low-cost
option..
Personally I'd still stick with steel it's more forgiving, they are mission critical parts... But this is because I am not a trained
engineer...
Dan
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ashg
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| posted on 16/12/09 at 05:44 PM |
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i cant see the problem with ali wishbones. my vauxhall estate has ali wishbones.
Anything With Tits or Wheels Will cost you MONEY!!
Haynes Roadster (Finished)
Exocet (Finished & Sold)
New Project (Started)
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mangogrooveworkshop
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| posted on 16/12/09 at 06:18 PM |
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Think we better warn this lad its a bad idea
http://www.ferron.nl/nieuws/news_us.asp
He has pretty much done the whole car in the stuff.... nice work
ps before any one gets the humph I do understand the reasons for the avoidance of ali in certain engineering designs
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liam.mccaffrey
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| posted on 16/12/09 at 06:19 PM |
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ali wishbones are fine if properly engineer, but should be forged not machined
[Edited on 16/12/09 by liam.mccaffrey]
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Bluemoon
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| posted on 16/12/09 at 06:32 PM |
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^^ indeed, my old push bike gives away the problem, the ali cracked after about 20 years, o.k on push bike with a life < 20 years but on a car
this will happen quickly unless designed correctly...
Dan
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boggle
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| posted on 16/12/09 at 06:45 PM |
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nice for show, but i wouldnt like to have that shock mounted on such a week point and im not keen on the matL rmoved from the rears.....
just because you are a character, doesnt mean you have character....
for all your bespoke parts, ali welding, waterjet, laser, folding, turning, milling, composite work, spraying, anodising and cad drawing....
u2u me for details
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designer
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| posted on 16/12/09 at 07:57 PM |
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Ali wishbones will be Ok if machined from solid and heat treated.
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v8kid
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| posted on 16/12/09 at 08:25 PM |
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By the time they are properly designed taking fatigue into account would they be any lighter?
I don't know but suspect not
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roadrunner
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| posted on 16/12/09 at 08:47 PM |
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Nice uprights though
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Liam
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| posted on 16/12/09 at 11:39 PM |
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Shiny and machined doesn't always equal good engineering. The wishbones look to be hollowed out from the inner edge making them a sort of
c-section. Good for twisting and buckling if you asked me. Stronger lighter wishbones could undoubtedly be made from steel tube, but I guess this
guy likes using 3D CAD to design parts for machine-from-billet. Very shiny though.
Liam
[Edited on 16/12/09 by Liam]
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Findlay234
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| posted on 17/12/09 at 09:42 AM |
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Nothing wrong with making all the bits from ali... just ensure good design from the start... get your stress analysis books out and dont just rely on
FEA. looking into fatigue life and cyclic loading should give an idea of part lifetime but i guess ali parts are more suited to race and track
situations than 20 years use on the road... Forged should be stronger weight for weight.
A design thats strong enough will be lighter, a design thats strong enough and will last 20 years may not be. Ali doesnt have the flexibility of steel
that allows for long term cyclic stressing.
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Neville Jones
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| posted on 17/12/09 at 11:30 AM |
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Those wishbones on the bec thing at the start of this thread, would be heavier than steel items of the same strength doing the same job.
All ali parts in racing, and more particularly the aviation industry, are 'lifed'. They just don't last as long as steel, even
though they save weight.
As far as 'strength/weight', there's only a couple of alloys in ali made that will outlast steel in cyclical loaded conditions, and
they can be considered 'unobtainium' for everyday man's purposes.
Everything has it's place, as to fitness for purpose and ease of fabrication.
Cheers,
Nev.
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MikeRJ
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| posted on 17/12/09 at 08:30 PM |
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quote:
Originally posted by designer
Ali wishbones will be Ok if machined from solid and heat treated.
Design is infinitely more important than method of construction and heat treatment. The advice given the chap who asked about this recently was
correct, a locost design wishbone in alloy will either fail very quickly or be no lighter (or even heavier) than a tubular steel one.
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