okay thank you!

i do want to use 6061 but there aren't too many suppliers of aluminum
alloys in my country and I just found this one that sells 6063 alloy
products.

either 6061, 7075 or 2024 alloys but then it's really difficult to
look for suppliers here.

i guess i'll have to look around some more.







On Apr 7, 9:46 pm, "Ed Huntress" wrote:
wrote in message

...



I was thinking with enough outer diameter and wall thickness maybe
6063 will be good enough and still be lighter than using steel tubing.

On Apr 7, 9:49 am, cavelamb himself wrote:
wrote:
Is 6063 aluminum tubing suitable for making a bicycle or motorcycle
frame? is it strong enough?

The safe answer is no.

6061T6 - maybe - depending on size adn wall.

--
(remove the X to email)

Now just why the HELL do I have to press 1 for English?
John Wayne

Why 6063, and not the more common 6061? Do you happen to have a stock of
6063?

Bicycle frames have been made out of 6061. I had an Italian Allegro aluminum
frame on my sprint bike in the late '60s. It was too flexible, but aluminum
framed bikes have come a long way since then. They generally use
larger-diameter tubes to overcome the lack of stiffness.

I don't know about motorcycle frames. Spaceframe racecars have been made out
of 6061, and the Bobsy sports-racer of the 1960s was very successful with an
aluminum spaceframe:http://sports.racer.net/chassis/bobsy/sr3_1965.htm

However, aluminum has little or no advantage over steel in a spaceframe
application. If the structure's tubes are loaded only in tension and
compression, as in a spaceframe, aluminum's properties result in a chassis
that weighs about the same, is roughly as stiff, and roughly as strong as a
steel one. But it's several times harder to weld and it costs several times
more.

Aluminum shows its advantage in structures that are subject to bending,
rather than to tension/compression. A bicycle frame does have bending loads.
A motorcycle frame generally has some, but not always.

So you want to think carefully about why you'd use aluminum. Most engineers
who have approached it have decided it's more trouble than it's worth, with
rare exceptions.

--
Ed Huntress