This is a continuation of Raz's thread in the Bodywork section. see;
http://www.locostbuilders.co.uk/forum/4/viewthread.php?tid=142269
Having rectified my gaff over the different radii of the mating pieces it all went together quite well and it has, I believe, proved the technique
and the belief that it can be achieved with only a piece of plywood and a hammer.
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[Edited on 7/9/10 by 2cv]
[Edited on 8/9/10 by 2cv]
More detail on how you did it please 
I'd guess that has been done by cutting slits down three of the sides and welded back together. Only a guess tho because of the griding on it.
quote:
Originally posted by mattyc
I'd guess that has been done by cutting slits down three of the sides and welded back together. Only a guess tho because of the griding on it.
It was Raz's post in the Bodywork section that started this off and I've put some pictures on that thread to illustrate the technique. This
will take you there;
http://www.locostbuilders.co.uk/forum/4/viewthread.php?tid=142269&page=2
He was asking for a 60 degree radius and 15mm square tube.
I drew the required radius on a piece of marine ply and cut it to the line. I then cut a strip of mild steel 24mm wide and clamped it between the two
pieces of ply as shown in the photo. It was tapped over, stretching it, to form an L section, this being the first half of the box.
I then cut another pattern with the correct radius to mate with the first and with the steel clamped as before, tapped it over but this tme shrinking.
Any little puckers can be removed by careful hammering against a flat surface.
The two pieces were fusion welded (no filler) using TIG.
I've just had a go at this to show how a bend of the required radius can be made quite easily using just simple tools that we have available. I
only wanted to prove the technique and show that it works rather than spend a lot more time to produce a top quality test piece. I hope this will
encourage Raz to take the Locost route.
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[Edited on 8/9/10 by 2cv]
I am really impressed by your ingenuity and diligence John! You started out with flat sheet, hammering it to shape around a plywood form and then
welding the two sections together - really neat job! 
Raz, I thought you were on holiday.
quote:
Originally posted by 2cv
Raz, I thought you were on holiday.
Raz, U2Ud