Maker
Most folk just call me; Orange Joe
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I made a strange looking test part, very coarse tapered thread in a straight shaft, quite cool.
It's an expeller press, for crushing the oil out of nuts and seeds, the final part would be stainless, twice and long and narrower flights/wider flutes, probably more trapezoidal than square threadform too. In use it would slowly rotate in a housing, which I think needs lengthways grooves, seeds would be fed in at the "deep" end, be forced along to the shallow end, crushing them leaving the oil and any water in them to flow back along the grooves and out of a screen, and dry smushed up seed pulp to come out the end.
I probably won't actually build it though, I don't know how I'd machine the grooved housing, I don't know what I'd power it with or how I'd attach it, I doubt a Kitchenaid has the torque and I'd be worried about breaking the juice extractor if it seizes. Plus, I imagine for the oil to be any use in cooking it would need to go through a centrifuge after pressing to separate the oil from any water and any solids that make it through. You can actually buy an oil press to fit a juicer, not cheap though. It's good to know I can machine the auger anyway, I'll keep thinking about designing the rest of it until I get distracted by a new idea, I'll have moved on by tomorrow knowing me.
It's an expeller press, for crushing the oil out of nuts and seeds, the final part would be stainless, twice and long and narrower flights/wider flutes, probably more trapezoidal than square threadform too. In use it would slowly rotate in a housing, which I think needs lengthways grooves, seeds would be fed in at the "deep" end, be forced along to the shallow end, crushing them leaving the oil and any water in them to flow back along the grooves and out of a screen, and dry smushed up seed pulp to come out the end.
I probably won't actually build it though, I don't know how I'd machine the grooved housing, I don't know what I'd power it with or how I'd attach it, I doubt a Kitchenaid has the torque and I'd be worried about breaking the juice extractor if it seizes. Plus, I imagine for the oil to be any use in cooking it would need to go through a centrifuge after pressing to separate the oil from any water and any solids that make it through. You can actually buy an oil press to fit a juicer, not cheap though. It's good to know I can machine the auger anyway, I'll keep thinking about designing the rest of it until I get distracted by a new idea, I'll have moved on by tomorrow knowing me.
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They do very well with the odd bit of boost 
I built a kit some years back, but to be honest I couldn't be bothered with the power crazy assessors at the SVA/IVA stations, I made it a track only car. Probably a sensible idea given my driving skills 
