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  1. Thread: Score

    by Anon
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    4
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    86

    If that's a vacuum dewar (do they make any other...

    If that's a vacuum dewar (do they make any other kind for LN2 service?), and if the vacuum is good, that could be worth a fair amount of money. I don't know what they go for used, but they're...
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    1,354

    One other possible solution, depending on how...

    One other possible solution, depending on how much meat you have to work with, is to machine the spindle nose in-place to whatever taper or thread you want on it. It's not necessarily an easy...
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    479

    If this guy (http://www.5bears.com/bal.htm) can...

    If this guy can balance a model jet turbine by hand, I think you should be able to relatively easily balance the rotors of a supercharger using the same method.
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    701

    I suppose it depends on the shop vac, but you can...

    I suppose it depends on the shop vac, but you can get rid of a lot of noise by using an induction motor instead of a brushed universal motor. Of course, high-speed air movement can still be pretty...
  5. Thread: Gun Parts...

    by Anon
    Replies
    27
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    842

    I have absolutely no experience with carbide...

    I have absolutely no experience with carbide taps, so take this with a grain of salt, but when I first saw them my first thought was that they were for abrasive materials (like fiberglass and stuff),...
  6. Thread: Gun Parts...

    by Anon
    Replies
    27
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    842

    It would get the area hot enough to anneal, yes....

    It would get the area hot enough to anneal, yes. The concerns with that are, if it cools too fast from conduction into the surrounding metal, it will basically re-quench it and it'll end up hard...
  7. Thread: Gun Parts...

    by Anon
    Replies
    27
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    842

    Case hardening isn't typically that deep,...

    Case hardening isn't typically that deep, somewhere in the neighborhood of 0.020" (depending heavily on the process parameters of course). What I'd be worried about is if the metal is...
  8. Thread: Gun Parts...

    by Anon
    Replies
    27
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    842

    8620 steel is tough stuff. Drilling hardened...

    8620 steel is tough stuff. Drilling hardened steel with the correct type of carbide drill isn't too bad, but I have next to no clue how you're supposed to tap it. HSS is, in theory, hard enough to...
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    I can't match indiscriminate scavenger's...

    I can't match indiscriminate scavenger's experience, but I have melted iron on both waste oil and propane. The furnace I use is identical to the furnace detailed in my book, if you want construction...
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    The green (or orange) pressure treated color...

    The green (or orange) pressure treated color won't be there on wood that's weathered and has been cleaned. It'll look pretty much like untreated wood looks. Once you put a penetrating oil on it,...
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    215

    It's only a useful thing for certain specific...

    It's only a useful thing for certain specific alloys. I remember from my materials classes that the formation of martensite happens at below room temperature, so some maraging steels would have heat...
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    197

    My dad used to do this professionally, so I can...

    My dad used to do this professionally, so I can tell you with some authority that Thompson's Water Seal is absolute crap.

    The grey color is mold and dirt: you can't apply any product, no matter...
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    Probably. But if you make them out of 100% kaolin...

    Probably. But if you make them out of 100% kaolin clay (instead of adding calcined kaolin and fired-kaolin grog, or other varieties of grog if you don't have to make them 100% kaolin) then they will...
  14. That makes me wonder how long a fridge compressor...

    That makes me wonder how long a fridge compressor would last if you oiled it by drip-feeding WMO into the inlet, and just let it mix with the atomized fuel afterwards. Of course it's not the...
  15. I don't know a whole lot about Babingtons, but I...

    I don't know a whole lot about Babingtons, but I was under the impression that they were pretty air-hungry. I suppose it depends on the size of orifice you're using.

    If you have a 1/16" hole...
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    I'll admit I only skimmed the threads in...

    I'll admit I only skimmed the threads in question, but I'm not entirely sure what the furor is about. So, some carbon leaches from the crucible to the iron. So what? Cast (gray) iron is a pretty huge...
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    Stainless steel has plenty of iron in it, so it...

    Stainless steel has plenty of iron in it, so it will dissolve into your cast iron. There might be some sort of refractory barrier that would make it workable, but you're so close to the melting point...
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    I haven't had any injuries from melting. I have...

    I haven't had any injuries from melting. I have had a few close calls...a couple of steam explosions before I knew how to avoid them, one case of "wet flux" that threw a bunch of hot flux and...
  19. Reducing is good for copper and silver alloys,...

    Reducing is good for copper and silver alloys, which dissolve oxygen. Other metals want different treatment (e.g. aluminum wants oxidation because it dissolves hydrogen). If in doubt, you can't go...
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    That seems really odd to me. Paper is made of...

    That seems really odd to me. Paper is made of carbon, hydrogen, and oxygen (in the form of cellulose)--so the gases you're bubbling through the melt contain the stuff you're trying to get rid of. I...
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    No photos unfortunately, though I usually just...

    No photos unfortunately, though I usually just put 3 attachments to the inside of the ring, evenly spaced. I haven't done much jewelry work, so like I said, this may be considered excessive by...
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    It sounds like you're trying to do something like...

    It sounds like you're trying to do something like jewelry-style casting, where the torch flame is directly on the metal, in a very shallow crucible. Most of the casting done here is with larger...
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    510

    When I did rings I typically turned them sideways...

    When I did rings I typically turned them sideways and put 3 sprues on them--that may be overkill but I never had a short pour. The inside of a ring is a good place to put a sprue because it's a place...
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    Sticky: It's not a bad comparison: the method of action...

    It's not a bad comparison: the method of action is different (fluxes are not surfactants) but they do both act as wetting agents. The flux reduces surface tension in aluminum by removing the layer of...
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    Fine silver is very soft. Dunno how it casts,...

    Fine silver is very soft. Dunno how it casts, I've always used sterling--but I'd assume it doesn't cast that well, like other pure metals.

    In addition to the copper, you can add a smidgen of zinc...
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