Search:

Type: Posts; User: Anon

Page 1 of 20 1 2 3 4

Search: Search took 0.15 seconds.

  1. Replies
    10
    Views
    211

    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...
  2. Replies
    100
    Views
    2,071

    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,...
  3. Replies
    14
    Views
    321

    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...
  4. Replies
    14
    Views
    321

    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...
  5. 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...
  6. Replies
    72
    Views
    3,396

    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...
  7. Replies
    19
    Views
    589

    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...
  8. Replies
    72
    Views
    3,396

    $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...
  9. Replies
    72
    Views
    3,396

    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,...
  10. 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 ~1000°C. My guess is, you now have an alloy, maybe gold-nickel, gold-copper, or gold-nickel-copper,...
  11. Replies
    8
    Views
    161

    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...
  12. Replies
    18
    Views
    824

    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,...
  13. 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...
  14. Replies
    51
    Views
    1,582

    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...
  15. Replies
    467
    Views
    31,844

    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...
  16. Replies
    15
    Views
    388

    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...
  17. Replies
    15
    Views
    388

    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...
  18. Replies
    20
    Views
    528

    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...
  19. Thread: Orfice size

    by Anon
    Replies
    2
    Views
    74

    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...
  20. If by "strongest" you mean "highest tensile...

    If by "strongest" you mean "highest tensile strength before permanent deformation" (yield strength) it might be possible to cast some tool steels. It would be very difficult, though (high temperature...
  21. Replies
    13
    Views
    339

    I've kept greensand molds for a couple days with...

    I've kept greensand molds for a couple days with some success (keeping them covered to slow drying). They tend to dry out and crack though. After a week, you should probably remake the mold, though...
  22. Replies
    18
    Views
    675

    Sticky: Done. When I drilled my graphite rod, I just...

    Done.

    When I drilled my graphite rod, I just flattened the end of a 3/16" mild steel rod and ground a drill point on the end of it. I can't remember how I started the hole, probably with a jobber...
  23. Build a Reil burner. They're super easy to make....

    Build a Reil burner. They're super easy to make. You can add a turbolator for improved low-pressure stability (at the cost of some high-pressure stability), but firing any propane kiln is a bit...
  24. Replies
    15
    Views
    534

    Interesting that changing the length of the...

    Interesting that changing the length of the outlet pipe didn't seem to do much.

    The high pressure isn't all that surprising--consider that the fuel-air mixture could make hundreds of PSI if...
  25. Replies
    15
    Views
    534

    If you change the length of pipe leading out of...

    If you change the length of pipe leading out of the burner, does the frequency of oscillation change?

    In order to set up that kind of oscillation, there has to be a cycle of air-fuel mixture...
Results 1 to 25 of 500
Page 1 of 20 1 2 3 4