Running along the front of this layout is a security fence, cranked concrete posts clad with chain-link fencing material and topped with 3 runs of barbed wire.
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The chain-link will be represented by tulle netting, but I couldn't find any 1/24-1/22.5 scale barbed wire. There are various products for 1/35 military modelling, but is just a pair of twisted wires.
As this fence will be in direct line of sight, it has to look like barbed wire. So after playing around with various gauges of wire, and various verions of twisting meethods, I came up with this laborious method.
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A slow running motor and hook.
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Using 32 SWG enameled copper wire, winding 3 turns and cutting the ends short, very boring.
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The barbs were spaced along a length of the same 32 gauge wire, with another alongside, and strung along a fixture with a means of aligning the barbs at a equal spacing wilst the motor twists the wires.
It's a length of 1/4 round steel bar with alternating spacing washers and brass cable clips, it keeps the barbs in place but doesn't impede the twisting along the length of the wires - chosen because I had the bits in stock.
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Well it worked ok, and with a waft of grey paint, it looks a bit like galvanized barbed wire.
The worst bit is winding the barbs, this test piece has about 50, and produced about 550mm. Using wire thinner than 32 gauge is very difficult to wind barbs, and really impractical. If you scale what I've produced, it is in reality overscale and simplistic, I think when the fence is complete, it will look the part.
The only trouble is I need to produce at least 25ft/ 7.5 mtrs.