On Tue, 07 Apr 2009 14:22:16 GMT, ARWadsworth wrote:

"Tim S" wrote in message
...
neverwas coughed up some electrons that declared:


Or there is continuous aluminium if you can afford it: ISTR claims for
up to 30m continuous lengths!


I presume that's formed on site out of a roll - seem to remember seeing
something like that?..

Seamless guttering.

It comes off a roll and is pressed on site (ie back of a van). The operator
sets the maching to mould the desired shape of the guttering.

Very impressive to watch.

Adam

I recently bought some galvanised steel sheets for the garage roof. Went to
the supplier and watched them form them - unrolled from a large coil, both
sides sheared off to make the correct width (the waste being re-rolled for
disposal) and then pulled through the rest of the machine, with each ridge
starting to be rolled at a different point, a second roller for each ridge
to form the final shape and a big guillotine to automatically chop the set
lengths.

They were dead cheap too. I got the impression that they were actually
machine repairers and refurbishers and their client had supplied the steel
for testing purposes!

SteveW