fork of sheet metal

Hobot

Hobot

Joined
Oct 19, 2005
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Lightest most strong tedius way to do yokes

http://coopersmithingco.com/tripleclamp.html

fork of sheet metal
 
A lot of work and a very neat job…….I do hope this guy has Public Liability Insurance if he is selling any of these to the general public :!: :?
 
Bernhard said:
A lot of work and a very neat job…….I do hope this guy has Public Liability Insurance if he is selling any of these to the general public :!: :?
Click to expand...

One of the things wrong with the world today, everyone expects the "other guy" to be responsible when I for one know riding motorcycles has its share of dangers, the roads are not glass smooth, there are a lot of idiots on the road, a deer could cross the road without warning...

The parts he builds look well made. I wonder if the triple trees built by Rob North out of sheet metal and used by many racers were faced with the same distrust :?:

Jean
 
Bernhard said:
A lot of work and a very neat job…….I do hope this guy has Public Liability Insurance if he is selling any of these to the general public :!: :?
Click to expand...

You must not have seen the rest of the site. I'd ride anything that guy made without a second thought. True craftsman.
 
Jeandr said:
Bernhard said:
A lot of work and a very neat job…….I do hope this guy has Public Liability Insurance if he is selling any of these to the general public :!: :?
Click to expand...

One of the things wrong with the world today, everyone expects the "other guy" to be responsible when I for one know riding motorcycles has its share of dangers, the roads are not glass smooth, there are a lot of idiots on the road, a deer could cross the road without warning...

The parts he builds look well made. I wonder if the triple trees built by Rob North out of sheet metal and used by many racers were faced with the same distrust :?:

Jean
Click to expand...

As a defence to myself you take my comments in entirely in the wrong context.
I am only stating the obvious, that prevention is better than the cure…….
Any factory these days has to have Public Liability Insurance.
Nuff said.
 
Bernhard said:
Jeandr said:
Bernhard said:
A lot of work and a very neat job…….I do hope this guy has Public Liability Insurance if he is selling any of these to the general public :!: :?
Click to expand...

One of the things wrong with the world today, everyone expects the "other guy" to be responsible when I for one know riding motorcycles has its share of dangers, the roads are not glass smooth, there are a lot of idiots on the road, a deer could cross the road without warning...

The parts he builds look well made. I wonder if the triple trees built by Rob North out of sheet metal and used by many racers were faced with the same distrust :?:

Jean
Click to expand...

As a defence to myself you take my comments in entirely in the wrong context.
I am only stating the obvious, that prevention is better than the cure…….
Any factory these days has to have Public Liability Insurance.
Nuff said.
Click to expand...

Sorry to have rattled your cage, I see the same comments from many riders, they have the fear of doing something themselves and would rather pay for someone else's product just because they "think" paying will give them the assurance the parts will not break and if they do, then they are "protected" In my book, when something goes wrong either through my fault or someone else's, *I* am in trouble.

Having public liability does not make a product better, very often, they would rather pay a lawer than honor a claim.

Jean
 
I did not expect the recoil reactions as this sheet steel yoke is most lightest and strongest toughest way to construct them, so not at all dangerous when done to this extremely fine level. Liability issues for manufacture's is more a political and money gambling cartel enterprise than engineering or safety based issue.
 
hobot said:
.............as this sheet steel yoke is most lightest and strongest toughest way to construct them, so not at all dangerous when done to this extremely fine level.
Click to expand...

So you have tested these and had an army of engineers conduct a finite element/difference analysis on them. If the answer is no then you are blowing smoke.

Please tell me why all the advanced (and retarded) motorcycle manufacture not think of this and exploit it's superiority years ago? Pretty obvious, eh :oops:

I commend the fellow who made this as it is a piece of art.

Rob North fabricated triple clamps (upper and lower yoke) with welded steel plate or steel sheet. These were race tested. The above is still a question.

hobot said:
Liability issues for manufacture's is more a political and money gambling cartel enterprise than engineering or safety based issue.
Click to expand...

It is called risk management. It is the nature of the real world as we live it.
 
The type of construction has been tested for it advantages as you attest to. The current item looks like everything vital accounted for. I'm not qualified to judge it beyond prior similar race run examples I've seen. If something dangerous is apparent to you point it out to us or pass it along to this shop. I'd buy one in steel but not in Al or Ti.
 
Dances with Shrapnel said:
hobot said:
.............as this sheet steel yoke is most lightest and strongest toughest way to construct them, so not at all dangerous when done to this extremely fine level.
Click to expand...

So you have tested these and had an army of engineers conduct a finite element/difference analysis on them. If the answer is no then you are blowing smoke.

Please tell me why all the advanced (and retarded) motorcycle manufacture not think of this and exploit it's superiority years ago? Pretty obvious, eh :oops:

I commend the fellow who made this as it is a piece of art.

Rob North fabricated triple clamps (upper and lower yoke) with welded steel plate or steel sheet. These were race tested. The above is still a question.

hobot said:
Liability issues for manufacture's is more a political and money gambling cartel enterprise than engineering or safety based issue.
Click to expand...

It is called risk management. It is the nature of the real world as we live it.
Click to expand...

I recall reading about HD when they came out with their springer front end a few years ago, they went through all the engineering programs, finite element analysis etc, and they came out with a product that was very close to what HD had produced 70 years before. How had they come out with this with no comuters, trial and error and basicaly, if it looks good enough, it probably is good enough. I don't think Rob North even knew how to log on a computer when he made his sheet metal triple trees, the fact they were "race proven" is only a testimony to his craftmanship. They were probably overbuilt compared to a similar product that is computer designed, but then they were just as good as the cast or forged stock items, but lighter which is what he was looking for.

Like Swoosh said, I would ride anything this guy ever made.

Jean
 
So now hobot says it "looks like everything vital is accounted for". OK, three, two, one blast off!. You work on one or two space shuttle missions?

As far as similar race run examples, I have yet to see anything like this. The Rob North triple clamps were not hand formed; from recollection he used flat sections welded together. Apples to oranges.

Well with tubes in the lower yokes it "looks" like I could bend the snot out of the yokes in a heart beat - just saying. I can not do that with any new or vintage yokes built to purpose.

Let the user beware. They are a thing of beauty, just wondering about the performance and testing to back it up. Not making any claims of far superior suitability.

Actually had me thinking of a properly designed and fabricated triple clamp arrangement - welded aluminum plate in a Rob North fashion. It could be made deep section.
 
Jeandr said:
I recall reading about HD when they came out with their springer front end a few years ago, they went through all the engineering programs, finite element analysis etc, and they came out with a product that was very close to what HD had produced 70 years before. How had they come out with this with no comuters, trial and error and basicaly, if it looks good enough, it probably is good enough. I don't think Rob North even knew how to log on a computer when he made his sheet metal triple trees, the fact they were "race proven" is only a testimony to his craftmanship. They were probably overbuilt compared to a similar product that is computer designed, but then they were just as good as the cast or forged stock items, but lighter which is what he was looking for.
Click to expand...

Most people would settle for a little pencil to paper calcs by a qualified person or a few tests - maybe stiffness tests to give some clue? :?

Jeandr said:
Like Swoosh said, I would ride anything this guy ever made.

Jean
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I would gladly stand on the sidelines and watch....out of morbid curiosity. :D
 
The old morbid fascination angle eh?
I think there is video extant of a Britten testing their sheet carbon fibre front end - the test rider found it wanting, he popped it up on the rear wheel & when it dropped back down the fork fell apart -face planting him.
Nasty, but similar in principle to the old 'sound barrier' exploits , suck it & see/ right stuff & all that...
 
Yes, composits, tricky stuff, especially when interfacing with non composits.

With the sound barrier, there was some homework and testing behind it and yes some 'let's see what happens" or more like "watch this!"

I remember a Stu Carter breaking his magnesium triple clamps at the end of a long straightaway racing; it was a Colin Seeley Mk2. Not pretty at all and probably could have been avoided. Just saying.

With the morbid fascination angle you live and learn - vicariously whereas "the right stuff" well a dead pilot is a dead pilot.
 
Well, as far a the NASA shuttle example goes - one failed going up & another coming back, but they seemed to learn from it, just like the F104 fighter jet with the downward firing ejection seat, not such a brilliant idea.
Spose the good ol Aussie invention -the 'Black Box' flight data recorder, speaks up when dead men tell no tales.
 
J.A.W. said:
Well, as far a the NASA shuttle example goes - one failed going up & another coming back, but they seemed to learn from it, just like the F104 fighter jet with the downward firing ejection seat, not such a brilliant idea.
Spose the good ol Aussie invention -the 'Black Box' flight data recorder, speaks up when dead men tell no tales.
Click to expand...

Black boxes are actually a Canadian invention.

Now how do you all suppose they came out with these fancy finite element analysis programs? Basicaly, they used data collected on samples they destroyed in testing, then they extrapolated based on these findings. The first rockets they sent to the moon were all based on seat of the pants engineering. The old engineers and architects made things in small step increments, they did not start with a 100 story building, they built them higher and higher as time went by. With good programs and good data, they now design wilder and wilder just because they now can test their ideas virtually before laying down the first brick. Are they always right? only time will tell, but as time will let you know, knife edge designs may be good for a while (usually as long as the warranty), but they may fall short in 10, 20 or more years.

Jean
 
Jeandr said:
J.A.W. said:
Well, as far a the NASA shuttle example goes - one failed going up & another coming back, but they seemed to learn from it, just like the F104 fighter jet with the downward firing ejection seat, not such a brilliant idea.
Spose the good ol Aussie invention -the 'Black Box' flight data recorder, speaks up when dead men tell no tales.
Click to expand...

Black boxes are actually a Canadian invention.

Now how do you all suppose they came out with these fancy finite element analysis programs? Basicaly, they used data collected on samples they destroyed in testing, then they extrapolated based on these findings. The first rockets they sent to the moon were all based on seat of the pants engineering. The old engineers and architects made things in small step increments, they did not start with a 100 story building, they built them higher and higher as time went by. With good programs and good data, they now design wilder and wilder just because they now can test their ideas virtually before laying down the first brick. Are they always right? only time will tell, but as time will let you know, knife edge designs may be good for a while (usually as long as the warranty), but they may fall short in 10, 20 or more years.

Jean
Click to expand...

Jeandr said:
The first rockets they sent to the moon were all based on seat of the pants engineering.
Click to expand...

I know you don't mean that in a literal senses. Von Braun would be turning over in his grave.

Furthermore, actually I invented the black box. :roll:

But back to the subject yokes. If it were me, for my own use, I would do some simple semiquantitative stiffness tests like seeing how far the fork tubes deflect with only the lower yokes in place - something real simple and compare it to other more robust yokes.

World of respect for the craftmanship and quality illustrated in the fellows web site.
 
David Warren, inventor of the B/B flight data recorder was Australian, & dont go bringing bloody SS/Nazi rocket scientists into it.
Actually they killed the 1st Apollo crew by fire after specifying oxygen instead of air for the capsule..whoops.
 
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