nib1980
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| posted on 4/9/12 at 06:47 AM |
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Photo results - crappy week
Hi guys,
heres the end results of the crappy week.
 
failure 1
 
failure 2
 
failure 3
 
failure 4
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designer
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| posted on 4/9/12 at 07:32 AM |
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That wishbone should be a heavier gauge.
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MRLuke
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| posted on 4/9/12 at 10:59 AM |
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Depends on whether you would rather be replacing wishbones or doing chassis repairs really 
Hopefully wont be long before you are back on the road 
[Edited on 4/9/12 by MRLuke]
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sa-fabrication
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| posted on 4/9/12 at 11:34 AM |
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I made a similar wishbone last week and noticed immidiatley that this would be an issue.
I am going to develop a better and stronger set of wishbones.
Just out of interest, did you hit anything? or did they just fail under cornering?
Ive noticed quite a few faliures in that area of the wishbone design.
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nib1980
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| posted on 4/9/12 at 11:41 AM |
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Bbeen fine for 6 years then went under braking.... Thankfully in a straight line
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nib1980
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| posted on 4/9/12 at 11:42 AM |
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Bbeen fine for 6 years then went under braking.... Thankfully in a straight line
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bartonp
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| posted on 4/9/12 at 01:17 PM |
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Looks like it's gone right where you'd expect - as the mounting plate finishes, and the heat affected zone from the weld (MIG?) meets the
virgin tube. Quite a good case for brazing there, if you want to make it that slim....
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designer
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| posted on 4/9/12 at 02:33 PM |
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quote:
Quite a good case for brazing there, if you want to make it that slim....
Don't think you are allowed to braze road cars, even if racers do it.
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myke pocock
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| posted on 4/9/12 at 06:35 PM |
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Certainly LOOKS thinner wall than that I used. Did you make them yourself or buy them? Is it ERW or seamless? BTW designer, why can you not braze a
chassis for the road?
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David Jenkins
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| posted on 4/9/12 at 06:56 PM |
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Caterhams are brazed (or used to be, anyway).
The main thing is that they are bronze-brazed (copper + tin) - very strong - rather than brass-brazed (copper + zinc) - rather brittle.
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nib1980
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| posted on 4/9/12 at 07:14 PM |
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mope bought in parts when i got the kit
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MikeRJ
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| posted on 5/9/12 at 02:06 PM |
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quote:
Originally posted by designer
That wishbone should be a heavier gauge.
That wishbone should be properly designed rather than just making a flawed design heavier. The GTS style wishbones have a fraction of the bending
moment (in both planes) that this one does, and is probably lighter.
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40inches
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| posted on 5/9/12 at 02:47 PM |
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Same design as these would be much better haynes roadster FRONT WISHBONE set locost 7 kitcar | eBay
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nib1980
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| posted on 5/9/12 at 02:56 PM |
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Any idea how I can check dimension and that they fit cortina hubs
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40inches
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| posted on 5/9/12 at 03:00 PM |
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Contact details, never hurts to ask
Phil Eagle
4 Ascot Mews
Southminster
Essex
CM0 7GH
United Kingdom
Phone: 07940708360
Email: talonmotorfabrication@gmail.com
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bartonp
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| posted on 5/9/12 at 03:12 PM |
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quote:
Originally posted by myke pocock
Certainly LOOKS thinner wall than that I used. Did you make them yourself or buy them? Is it ERW or seamless? BTW designer, why can you not braze a
chassis for the road?
If your name's 'Lotus' you can glue it if you want to.
Phil.
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austin man
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| posted on 5/9/12 at 05:09 PM |
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Mine bent at that point I believe due to using a zetec rather than the lighter Kent engine which the locost idea originally housed. MK mas me some in
Flat oval bar never had a problem after that
Life is like a bowl of fruit, funny how all the weird looking ones are left alone
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Minicooper
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| posted on 5/9/12 at 08:04 PM |
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quote:
Originally posted by nib1980
Any idea how I can check dimension and that they fit cortina hubs
No idea if they will fit or not, but I have pair of lower haynes roadster wishbones manufactured by 3GE, £60.
If you provide your dimensions I can compare them to my wishbones to see if they are compatible
Cheers
David
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Minicooper
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| posted on 5/9/12 at 08:07 PM |
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quote:
Originally posted by MikeRJ
quote:
Originally posted by designer
That wishbone should be a heavier gauge.
That wishbone should be properly designed rather than just making a flawed design heavier. The GTS style wishbones have a fraction of the bending
moment (in both planes) that this one does, and is probably lighter.
Mike,
What makes the gts wishbones have a lower bending moment? Just trying to understand the difference between the original wishbone
Cheers
David
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Not Anumber
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| posted on 28/11/12 at 08:42 AM |
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who made the original wishbones that broke ?
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mcerd1
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| posted on 28/11/12 at 01:14 PM |
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quote:
Originally posted by designer
quote:
Quite a good case for brazing there, if you want to make it that slim....
Don't think you are allowed to braze road cars, even if racers do it.
I'm led to believe TIG welding is another option, but for a locost solution a heavier gauge tube or a better design around the welds would be
easier
[Edited on 28/11/2012 by mcerd1]
-
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coyoteboy
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| posted on 28/11/12 at 01:36 PM |
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I've never seen anything that suggested that any form of connecting parts was illegal, other than to suggest that it should be secure and strong
enough. No reason not to glue parts if you can do it in a controlled and safe way.
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designer
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| posted on 28/11/12 at 02:10 PM |
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Most IVA inspectors do not like brazing as you cannot guarantee what rod you have used and, above all, who has done it. Welding is prefered as it is
easier for an amateur and easier to judge the quality by the look.
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coyoteboy
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| posted on 28/11/12 at 09:57 PM |
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But does it specify anywhere that you can't? I think they'd have a hard job arguing it really, in the same way they can't see who
made it and how, the same applies to a whole heap of stuff - at what point do you stop - is your flywheel lightened? If so, how do they know it
won't explode - who did it and how?
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skodaman
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| posted on 29/11/12 at 12:18 AM |
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I've had a car fail mot because of brazed sills and that was over 25 years ago so I'd presume it's not allowed on anything
structural even if various racing machines have used it.
Skodaman
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