that's nice. The smaller pins could perhaps be drilled right through and welded top and bottom?
One pin near the end right through and two others on opposite sides at different spacings? The same at the other end would allow for four thicknesses of metal.
For clarity - he didn't mean drill through the pins, he meant drill through the main bar and push the pins through that so they stick out both sides.
(Took me a few reads to cotton on!)
It depends really on how many different internal radii you want - the front pin (the larger in my pic) forms the 'mandrel' about which the metal is drawn, so it dictates the diameter of the circle created.
Al Dat makes sense. Yet again a picture makes things so clear.
I love simple brutal technology like this.
Interestingly, I hade never heard of this approach to bending stuff, however
I once made a version of this for bending strip on it's side, the 'hard way'.
I was an innocent know nothing, my daft idea was happily bending 25x3mm strip into quite deep curves.
I used two pieces of 30x5mm strip about 120cm long with 10mm pins 3mm apart width wise and about 80mm apart lengthwise. It worked a treat.
Until I needed some 5x30mm strip and cut it up. Ho Hum.