why not cast a bicycle frame??
why not cast a bicycle frame??
(OP)
I was wondering why a cast frame of a bike frame would not work??
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why not cast a bicycle frame??
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why not cast a bicycle frame??why not cast a bicycle frame??(OP)
I was wondering why a cast frame of a bike frame would not work??
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RE: why not cast a bicycle frame??
If you _could_ make a bike frame entirely by casting, and it _didn't_ weigh a ton, the founder would surely win a prize.
Today's safety bicycle is a highly evolved product, not likely to change in any major way ...
... until its replacement shows up and kills the market overnight.
Casting is probably not a good way to make a bicycle frame, or someone would have done it. But it might be the best way to make the frame of the bicycle's replacement, whatever that turns out to be, so don't feel limited by what I said above.
The world is overflowing with unlimited opportunities, disguised as insoluble problems. Some of the disguises are very good....
Mike Halloran
NOT speaking for
DeAngelo Marine Exhaust Inc.
Ft. Lauderdale, FL, USA
RE: why not cast a bicycle frame??
RE: why not cast a bicycle frame??
RE: why not cast a bicycle frame??
Instead of tubular sections they are all H beam sections.
This could easily be cast, but I don't see the advantages.
It would be an interesting study to do.
It sure takes some re-thinking of the geometries.
= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.
http://www.trenttube.com/Trent/tech_form.htm
RE: why not cast a bicycle frame??
RE: why not cast a bicycle frame??
RE: why not cast a bicycle frame??
The Yamaha frames are not forged, they are cast. I'm sure a quick search of the Aluminum Association website or even a google search would yield information and photos about this.
frankiee,
One reason for not casting bicycle frames is that the tooling cost for some processes like high-pressure die casting are quite high, which is a problem because the number of frames of one style/size that can be sold is limited, which makes amortizing the cost difficult. A recent article by Josh Deetz in the June? issue of JOM described some of this as it relates to magnesium for bike frames.
RE: why not cast a bicycle frame??
RE: why not cast a bicycle frame??
Costs can be lesser if there is a greater acceptance for a bulkier bike.
RE: why not cast a bicycle frame??
It looks like everyone missed the mark on this one. Aluminum castings are much more brittle than other forms of aluminum. Structural failure happens with little notice with castings because they are not ductile. The stress strain curve is almost entirely a straight line; there is no nonlinear strain-hardening segment following the straight line portion. Ductile materials always experience a taffy-like HIGH STRENGTH yielding event before failure. These materials are less likely to fail and, when they do, there is often an obvious sign that failure is going to occur!
Tunalover
RE: why not cast a bicycle frame??
I do agree that in the cast form there can exist mcro shrinkages and other forms of defects rendering the metal weak. But certainly not causing it to be so brittle, to break at being dropped.
RE: why not cast a bicycle frame??
I intended only to make a general statement. There are certainly exceptions to the rule. I am only going on my experience with aluminum diecastings. Aluminum diecastings are certainly more brittle than other forms of aluminum due to porosity and the lack of strain hardening inherent with molding and casting methods.
Tunalover