andy188
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| posted on 29/8/19 at 06:18 AM |
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arch stays breaking, new design
Arch stays broke again today, is there another design out here, or shall I remake out off thicker materials, I seem to be reweld these ever year, your
thoughts appreciated,
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mcerd1
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| posted on 29/8/19 at 07:06 AM |
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which uprights are they for / got any pics of your current ones showing were they break ?
just making them thicker will probably help, but its not necessarily the best answer - stiffening key area's, removing stress concentrations
and making them from better / tougher material (not all steel is made equal) could give you a better all round design
[Edited on 29/8/2019 by mcerd1]
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andy188
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| posted on 29/8/19 at 09:56 AM |
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Hi,
They are of Haynes design on sierra hubs, they are breaking close to the fixing posns on the bottom ball joint fixing and the top stub posn,
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40inches
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| posted on 29/8/19 at 11:01 AM |
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I haven't had any problems with the MK supplied ones.
I changed the flat strip for tubular fitting.
 
Description
 
Description
Just read your last post. Here are a couple of photos of the MK fixing brackets.
 
Description
 
Description
[Edited on 29-8-19 by 40inches]
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andy188
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| posted on 29/8/19 at 11:34 AM |
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Great, Thanks for the photos, yeh the brackets going to ball joint etc are thicker than mine,
Looks like ill beef them up a bit, spoke to some off the guys at work, ive had a back back, so we softened the ride up, could be its too soft,
allowing more movement off the arch, (vibrating, over bumps). Busy weekend ahead.
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russbost
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| posted on 29/8/19 at 12:21 PM |
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I always use flat strip for arch stay fabrication, tube is too rigid & will tend to crack over time due to vibration (it's also relatively
thin wall usually), using 5mm thick 25 or 30mm wide strip I've never had a stay break
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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David Jenkins
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| posted on 29/8/19 at 05:18 PM |
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There is always Plan B... absolutely no cracking after quite a few years of Suffolk roads. Prior to this mod the stays broke about 3 times.
The best bit is going to car shows and watching people trying to work out how I did it... 
Details of this can be found on my web site (see WWW link below).
[Edited on 29/8/19 by David Jenkins]
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voucht
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| posted on 30/8/19 at 08:14 AM |
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Hi,
My first ones broke very quickly too.
So I remade new ones with thicker steel strips (4mm) and tubes, welded on a larger triangular bottom plate, bolted at the bottom of the Sierra
upright. Then same system as the book for the upper attach point on the upright.
They are not vibrating at all, they are very steady, and I never had any problem since.
The construction is detailed on my blog here:
http://vouchtroadster.blogspot.com/2015/04/nouveaux-sup
ports-dailes-avant-new.html#ancre1
Change the language on the top left column, it will be google translated. Not perfect, but understandable enough.
Hop that will help 
https://vouchtroadster.blogspot.com/
https://cafrazx550.blogspot.com/
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