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  1. Replies
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    That's fine.

    That's fine.
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    Strictly speaking, my muller wheels have nowhere...

    Strictly speaking, my muller wheels have nowhere to go in the upward direction (I have a gearbox-on-top design, so they could ride up about 1/4" before running out of travel) but I notice most of the...
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    Sure, if they're hard firebricks. Typical hard...

    Sure, if they're hard firebricks. Typical hard firebricks are rated to 3000F, so you can dry-stack them or lay them with suitable mortar and you'll have a serviceable furnace. They aren't very...
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    Most suppliers ought to know what fireclay is,...

    Most suppliers ought to know what fireclay is, but if you go to a pottery supplier you will be given a pretty broad selection of clays. Most of them will work okay. What you want to avoid are: clay...
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    Impressive. I think it'll survive the next few...

    Impressive. I think it'll survive the next few nuclear wars, the way it's made...

    From experience: If you ever drop anything unwanted in there (like a tool or a bit of a casting) it will turn...
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    The blanket will be fine with direct flame as...

    The blanket will be fine with direct flame as long as you stay within its temperature limits (usually 2300F, so you might put a firebrick where the flame impinges so that spot doesn't overheat--or...
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    I made a bunch of crimp-style terminals for my EV...

    I made a bunch of crimp-style terminals for my EV out of copper plumbing connectors. They work well if done right; I haven't had a failure yet, and this is on about 50 individual ends (most on 2/0...
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    Having things based on powers of ten is awfully...

    Having things based on powers of ten is awfully convenient in a decimal number system. Inches and feet aren't so bad, but engineering calculations that start involving stuff like degrees Rankine,...
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    Not easily, or at least I can't. Aluminum is...

    Not easily, or at least I can't. Aluminum is plenty shiny (reflective enough that it's used for things like telescope mirrors). Zinc may have a duller finish if it's corroded, but aluminum can...
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    ZA-series alloys have creep issues at elevated...

    ZA-series alloys have creep issues at elevated temperatures, so you won't find them in the guts of an engine. Stuff that's not next to the hot parts might potentially be made of zinc alloy, but I...
  11. There's nothing particularly new about a...

    There's nothing particularly new about a Farnsworth-Hirsch fusor: that guy isn't the only hobbyist who's built one. Industrially, they're commonly used as neutron sources.

    Of course, the real...
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    Print the threads in soft wax? It seems like it'd...

    Print the threads in soft wax? It seems like it'd be pretty easy to make a decent impression with a warmed length of threaded rod. Whether shrinkage would change the thread pitch enough to matter, I...
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    I don't know anything about the low-temp burnout...

    I don't know anything about the low-temp burnout procedure, but when I did lost wax casting, the burnout temp was basically the same as the temp of the metal going in, and we poured the molds...
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    $9/lb is pretty high--it's somewhere around 2-3x...

    $9/lb is pretty high--it's somewhere around 2-3x spot price for most bronzes. Of course, I'm assuming that's the price for certified ingot in small volumes from a specialty supplier. One thing you...
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    Well personally, I think it would be a bit silly...

    Well personally, I think it would be a bit silly to make a lathe of any type and *not* give it a through hole. Machining a taper by trial-and-error isn't too hard if you have a good reference for it,...
  16. The gold didn't go anywhere--it will neither...

    The gold didn't go anywhere--it will neither oxidize nor boil under atmospheric conditions at ~1000C. My guess is, you now have an alloy, maybe gold-nickel, gold-copper, or gold-nickel-copper,...
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    It's sulfuric acid vapor from the battery,...

    It's sulfuric acid vapor from the battery, released (mostly) during charging. It will help greatly if you have lead or lead-plated terminals, because the exposed dissimilar metal junction makes the...
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    One potential problem with a bed made out of...

    One potential problem with a bed made out of rolled stock is that it may be prone to warp after machining due to residual stresses. You might be able to get around that by using hot-rolled stock,...
  19. I'd recommend buying commercial refractory grog...

    I'd recommend buying commercial refractory grog if you can get it (basically crushed fired clay, available in a range of sizes). You can also source ceramic ingredients (kyanite, alumina blasting...
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    So, if you set as follows: PD002 1 PD003 60...

    So, if you set as follows:

    PD002 1
    PD003 60
    PD004 60
    PD005 80

    Does your external pot give you 0-50Hz, 0-60Hz, or 0-80Hz? It should give you 0-80Hz if I'm reading the manual correctly. But if...
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    I have had some luck filling with paraffin wax....

    I have had some luck filling with paraffin wax. I've tried filling with ice as well, but it melts too fast on a thin copper pipe. The wax can be gotten rid of after the bend by dunking in boiling...
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    hobiejack: Thanks for the offer, but I've got a...

    hobiejack: Thanks for the offer, but I've got a solution now.

    I tried regrinding a concrete drill, and it worked perfectly. I'll have to keep that trick in mind in the future--I have quite a few...
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    Drilling O-1 after Hot Work

    I have a part that's made of O-1 tool steel (drill rod). This particular part requires a 1/4" hole to be drilled in a boss that was formed by hot forging into shape, so I can't do the drilling in the...
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    I think the piece would be very difficult to...

    I think the piece would be very difficult to reproduce in finished form using sandcasting with a single-piece pattern. However: I think it could be done with some patternmaking trickery. What comes...
  25. Thread: Orfice size

    by Anon
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    What size furnace? What size burner? What...

    What size furnace? What size burner? What temperature?

    For reference: A 1/2" pipe size Reil burner runs pretty well with an 0.023" MIG tip between 5-60 PSI. An 8" bore crucible furnace can, if...
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