damage frame? factory booboo?

fuzzball
New Member

Posts: 10

damage frame? factory booboo? Dec 7, 2008 23:41:53 GMT -5

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Post by fuzzball on Dec 7, 2008 23:41:53 GMT -5

I noticed this a while ago, but figured (i.e. hoped) that this was normal

. But on the Orange Toy Run this Saturday just past I spotted grandad's SR (http://sr500forum.proboards38.com/index.cgi?board=projects&action=display&thread=1673)
(check your e-mail grandad!) I had a look at his frame, but it was welded up nice.

You're looking at the frame just behind the rear brake switch. It doesn't look like the frame was damaged, it looks like they forgot to weld it up in the factory.

Anybody ever come across this before? Should be easy enough for the engineering place to fix it up shouldn't it?

curly001
Full Member

Posts: 199

damage frame? factory booboo? Dec 8, 2008 5:20:37 GMT -5

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Post by curly001 on Dec 8, 2008 5:20:37 GMT -5

Fuzz, thats how they came from the factory. Yours looks a little more distorted than most. A lot of the gusseting on the frame is not fully welded, maybe cause the welders couldn't get to that spot or it took to long on the line and was deemed unnecessary to weld it. Curly

Just one more 500 for the collection! I've got room in the shed & the wife won't notice(yeah right)!

aero
Senior Member

Posts: 267

damage frame? factory booboo? Dec 8, 2008 6:53:27 GMT -5

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Post by aero on Dec 8, 2008 6:53:27 GMT -5

I have noticed that some off the welding on early frames was terrible. I had my frame crack due to one weld that wasn't formed correctly.

However be careful on the statement 'the gusseting isn't fully welded'

You never weld the end of a folded gusset, the part I've marked in red. If you do you put stress into the tubes in an area they can't handle it.

Thinking of it like this isn't accurate, but it gives you a sense of what is happening. You know the old trick of being able to stand on an empty beer can...untill someone pings the can and it collapses...well welding the end of a gusset has a similiar effect to pinging the side of the beer can. You put in stress into the place the tube is weakest.

But I've had to go over plenty of the welds on my frame, they were shocking, cold starts at the ends (which caused my frame to crack), wandering off or just not welded (missing welds compared to otherframes).

Last Edit: Dec 8, 2008 6:56:10 GMT -5 by aero

solo2racr Senior Member Oh what fun, it is to ride, on a one hole cafe' bike!! Posts: 651	damage frame? factory booboo? Dec 8, 2008 13:07:39 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by solo2racr on Dec 8, 2008 13:07:39 GMT -5 What Aero said. Welding the end will simply move the stress to a single point on the tube instead of spreading it out.
	www.N-RPerformance.com

Post by fuzzball on Dec 7, 2008 23:41:53 GMT -5

Post by curly001 on Dec 8, 2008 5:20:37 GMT -5

Post by aero on Dec 8, 2008 6:53:27 GMT -5

Post by solo2racr on Dec 8, 2008 13:07:39 GMT -5