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Wire Drawing Machine No. 2
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After making silver tubes for the first time, I realized there was more to do afterwards. Common practice is to make them oversized and draw them to the size(s) needed. While thinner wire can be drawn manually, there is a lot more material being compressed in a tube. Even with a small tube, I would need a draw bench.

My first wire drawing machine does a respectable job on smaller wires but it is not made for tubes. The new one will do much thicker wires and tubes. Pulling 4.0mm and thicker wire won't be so Herculean! But the first order of business is drawing these 0.999 fine silver tubes to nothingness.

A trailer winch is basically the meat and potatoes of any home-brewed draw bench. I did find the winch to be rather unnerving because it has a lot of wind-up and hence, tension in the strap. Alarm bells go off when you're cranking and nothing's happening. When things don't move it often means something is about to break or give. Situations like this highlight what safety procedures and features are needed for every tool.

Ingenuity - not welders, plasma cutters, or profanity - will get this done. A few strategic holes, some timbers cut. Maybe a little profanity after all.

 
Alarm bells go off when you're cranking and nothing's happening.
 
To get the best of portability and length I opted for modular construction: a ~5ft standalone unit with sections added as needed. A draw bench can pull any length by repositioning the tongs after each pull. Tongs leave marks and can crush a tube so a longer bench means less time spent on regrabs.

Locking pliers replace draw tongs and a forged eye bolt connects the winch hook to the pliers (since publishing it has been upgraded to a forged straight-pull self-tightening clamp). An adjustable holder keeps the drawplate protected and positioned precisely.

Wood isn't the ideal frame material but 2x6s should be strong enough for further testing. Would switching to a metal framework mean a complete redo? Will it be too heavy or stupid? Practical?! The what-ifs and what-hows and what-elses need fixing because this ain't done yet!

There's a crossover period when the basic components are being built while the details evolve. When does a was going to become a really should have? These theories have to make it past the planning phase before they can get freaky in real life.


Posted by M: January 9, 2021


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