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  1. Thread: Metal Fabrication

    by Anon
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    361

    Strictly speaking, we have a whole category for...

    Strictly speaking, we have a whole category for metal fabrication, including "Machines and manual machining", "CNC machining", and "Model engines and engineering". I can add a fourth forum section...
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    You need a reverse on your lathe if you want to...

    You need a reverse on your lathe if you want to cut left-hand threads. Other than that, I can't think of anything it's actually necessary for (maybe if you want to machine a part that's screwed...
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    No, I haven't touched it since the contest. I...

    No, I haven't touched it since the contest. I really ought to one day...if I had plenty of time and motivation I'd probably re-cast it to get rid of the gas defect in the bottom.
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    Basically, yes. I'm not familiar with this...

    Basically, yes.

    I'm not familiar with this particular lathe. On my import lathe it's just a couple of socket head cap screws that hold the bed to the stands. Rigging the lathe to lift is the...
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    The way I would do this (your mileage may vary):...

    The way I would do this (your mileage may vary):

    -Slide the tailstock off. You may have to remove a stop, but it should just slide off the end of the bed.

    -Rig the lathe for lifting. I'd guess...
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    I can't really tell how big that lathe is, but...

    I can't really tell how big that lathe is, but I'd guess it's closer to 1000 lbs than 2000 lbs. (That heavy cast-iron stand might add a couple hundred pounds, though.) For reference, my 12x36 import...
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    If you plan on renting an engine hoist for circa...

    If you plan on renting an engine hoist for circa $50/day, I'd be more inclined to buy one--the Harbor Freight one is about $200 (might get it for $150 with a coupon). It's a really useful tool--I use...
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    A few comments, in no particular order: 1 lb...

    A few comments, in no particular order:

    1 lb of rods won't last any time. It's fine to only buy 1 lb of something that you won't use very much (like 1/16" rods for really thin stuff, or stainless...
  9. Thread: Magnesium

    by Anon
    Replies
    25
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    1,272

    Nitrogen isn't an inert enough purge for...

    Nitrogen isn't an inert enough purge for magnesium--it will happily burn in a pure nitrogen atmosphere. Argon or SF6 are good, though. Apparently SO2 is as well--but it's toxic so I'm not sure I'd...
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    I shop here for motors and gearboxes:...

    I shop here for motors and gearboxes: http://www.surpluscenter.com/default.aspx

    They're a surplus site, so their selection and pricing varies quite a bit, but they'll generally have stuff cheaper...
  11. Thread: Magnesium

    by Anon
    Replies
    25
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    1,272

    Magnesium doesn't contain any oxidizer, it's just...

    Magnesium doesn't contain any oxidizer, it's just really reactive. That's why you can extinguish it with inert gas (though typical extinguishing media such as water, dry sand, CO2, etc. are all...
  12. Thread: Buell Subframe

    by Anon
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    735

    I've had quite good success heat treating inside...

    I've had quite good success heat treating inside a gas kiln, and that's with fairly loose control over the temperature. The important things are that you don't want to actually melt the metal (or get...
  13. You can't weld the fittings of black iron water...

    You can't weld the fittings of black iron water pipe (they're cast iron, and while you can sort of weld cast iron, it's a difficult procedure), but the pipe itself (at least the modern stuff) is just...
  14. Thread: Howdy

    by Anon
    Replies
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    3,854

    Those cracks are fine. The only thing you're...

    Those cracks are fine. The only thing you're really worried about is if a big chunk of lining caves in, and even then you can usually put it back. Hairline cracks like that are basically a non-issue....
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    A note on that regard: You can purchase cutting...

    A note on that regard: You can purchase cutting and grinding wheels specifically for nonferrous metal, though they're a little bit pricier than the normal kind (or were when I last bought some). I...
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    How small is small? I'd say: Hacksaw (18tpi...

    How small is small?

    I'd say: Hacksaw (18tpi bi-metal blade), rectangular flat file, round file, assorted sandpaper 60 grit and up (all the way up to 1500 or 3000 grit if you want to put a mirror...
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    The Arduino board has a crystal oscillator on it,...

    The Arduino board has a crystal oscillator on it, which should keep time as good as a quartz watch (it's essentially the same thing). If you want to pull the microcontroller chip out and use it in a...
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    I haven't used it for that (my kiln would need a...

    I haven't used it for that (my kiln would need a servo-controlled gas valve to be controlled like that; I just run it manually) but it's something that would be well within its capabilities. Of...
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    I figured out where the second snippet of code...

    I figured out where the second snippet of code is, but I have yet to actually remove it from each page. That will probably happen tomorrow.

    While I'm at it: does anyone have an opinion on the...
  20. Even easier (at least easier for me, it may not...

    Even easier (at least easier for me, it may not be easier if you're working in MS Paint or something) is to make the graphic on the computer, print it out, and put it on the metal with toner...
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    Uh, those pages look fine when I download the...

    Uh, those pages look fine when I download the file. Maybe the file got corrupted in the download or there's a problem with your PDF viewer? Note that page 118 is one of the pages that's been left...
  22. Remember that you have two axes of a horizontal...

    Remember that you have two axes of a horizontal milling machine already--you can mill the dovetails on the lathe if you shim your workpiece to the correct height.

    Angle plates (or true right...
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    Poll: Hmm. I didn't know how critical the weather was...

    Hmm. I didn't know how critical the weather was for asphalt laying, but it makes sense.

    Indiana has a four-season climate--cold and snowy in the winter, wet and nasty in the spring, hot and...
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    I have no idea what kind of plastic would hang...

    I have no idea what kind of plastic would hang around in molten aluminum for that long--it should just turn to carbon at those temperatures, and of course the gas will find a way out.

    I still...
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    New Website Hosting

    Just as an FYI to those interested: My website is now finally up, and it's at a new address: http://prometheus-foundry.com

    That's a domain name I own, so now it shouldn't move around. In addition,...
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