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    Workholding -- itty bitty polycarbonate cones

    Not a model engine question, but for work: I need to make some little (about 1/2 inch in diameter) "chicklet" prisms that fit into cone-shaped holes, don't stick out much, and have nice flat, sloped faces on the outside. I'm planning on machining a sloped flat on the end of a rod, then cutting...
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    History of wedges as fasteners

    My understanding is that back in the Before Times, quite a while after it became unnecessary to do animal sacrifices to insure the fertility of your fields, but before you could order 3D printed parts over the Internet, machines were fastened together by tapping wedges into slots, rather than...
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    Turning large thin-wall tubing

    Large & thin wall as in 4 inch diameter, 1/8 inch wall, acrylic tube. Any attempt to just put it in a chuck results in a severely distorted tube. I'm thinking that I should either turn a piece that fits just inside the tube or making a cross-bar jack thingie. The turned piece has bonus of...
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    LTD Stirling

    If things work out, this is going to be a really excruciatingly slow build thread for a low temperature differential (AKA "coffee cup") Stirling. If not it'll be yet another abandoned thread. It's going to be a "Plans? Yes, I'm planning to build an engine!" sort of build. But I am looking...
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    Repair cast iron?

    These are two of the four jaws from an old Taig (I think) 4-jaw chuck that I've been abusing by using it on a much larger lathe than it was intended for. As you can see, I broke the tab off of one. I've got a new four-jaw chuck on order, but before I repurpose the chuck adaptor for that chuck...
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    Where to buy acrylic sheet in the US?

    Kinda off-topic, because I really need to know for work, but: Who's good for acrylic sheet in the US? I'm thinking of some place that's your go-to, the same way that I buy steel from either Online Metals or McMaster. I just need small amounts -- half a square foot in the thicknesses I need...
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    How do I order inserts for this?

    I have this bit set, it says "uses TT inserts", and "3/8 inch inscribed circle". But that's it. But when I search for "TT insert" I don't find anything (except that bit set). I did find this useful page that seems to indicate that I can maybe work out the inscribed circle. Can I just get...
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    Threading a long rod and keeping it straight.

    I'm trying to make needle valves per the drawing below, and I keep screwing up the spraybar. Basically, I get a nice machined straight brass rod, but as soon as I thread it I end up with a nice, threaded, gracefully bent, brass rod. How do people do this? I'm currently using a die in a...
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    eBay impulse buy

    I have no excuse -- because I currently don't have the skills to complete the engine, nor the time. I'm going to start on it after I've made one or two piston/liner sets, and maybe built one from billet. Or I'm gonna die of old age, leaving my kids to wonder what the heck to do with it...
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    Cleaning lapping compound

    I've had a semi-completed project sitting on my bench for about six years while Life happened. Around in 2012, I took a Cox TD which (I thought!) just needed a bit of lapping, or perhaps a new piston built. It turned out that the piston and cylinder were oval, and the con-rod and crank were...
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