• Scam Alert. Members are reminded to NOT send money to buy anything. Don't buy things remote and have it shipped - go get it yourself, pay in person, and take your equipment with you. Scammers have burned people on this forum. Urgency, secrecy, excuses, selling for friend, newish members, FUD, are RED FLAGS. A video conference call is not adequate assurance. Face to face interactions are required. Please report suspicions to the forum admins. Stay Safe - anyone can get scammed.
  • Several Regions have held meetups already, but others are being planned or are evaluating the interest. The Calgary Area Meetup is set for Saturday July 12th at 10am. The signup thread is here! Arbutus has also explored interest in a Fraser Valley meetup but it seems members either missed his thread or had other plans. Let him know if you are interested in a meetup later in the year by posting here! Slowpoke is trying to pull together an Ottawa area meetup later this summer. No date has been selected yet, so let him know if you are interested here! We are not aware of any other meetups being planned this year. If you are interested in doing something in your area, let everyone know and make it happen! Meetups are a great way to make new machining friends and get hands on help in your area. Don’t be shy, sign up and come, or plan your own meetup!

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  1. Tobho Mott

    Iron Casting

    @Wanderer sent some pictures. Hope I'm not stealing his thunder by posting them before he does. 6 wheels demolded... A little shrink at the base of the sprue on just one of them. Odd, since the molds were all pretty much identical. No matter, it will be bored out there for an axle...
  2. Tobho Mott

    Worn nuts for mill leadscrew

    I don't know if this will help you figure it out, but in this picture the piece on the left is C954 (aluminum bronze) and the piece on the right is Everdur (silicon bronze). Real aluminum bronze ought to have enough iron in it to be able to feel it with a magnet. The "backyard" version some...
  3. Tobho Mott

    Worn nuts for mill leadscrew

    I think it's just any normal glass, window or bottle or whatever, to form an airtight barrier between the metal and the atmosphere and shield it from oxidizing. But I've read about guys who swear it has to be brown bottle glass, lol. Jeff
  4. Tobho Mott

    Worn nuts for mill leadscrew

    Degassing coppers is usually done with phosphor copper shot. But it's done with just a tiny amount to 100 pounds of copper and if I recall correctly, overdoing it can be worse than not doing it at all. Tricky to get the right dose with just a few pounds of copper. If we had some scrap parts...
  5. Tobho Mott

    Iron Casting

    Rust is likely to be a factor. I was offered a princess auto blasting cabinet a while ago but I don't have a big enough compressor to run it yet, and not sure know where I'd even put it, so I grudgingly passed on it. I did try to knock as much of the rust off as I could buy banging on the...
  6. Tobho Mott

    Iron Casting

    Good question. I'm not sure how much effect that would have, the thin tip of the wedge is still going to freeze very fast. The 2 part mold required for that alone would insulate the mold cavity a little better and cause slower freezing that might help a bit. By enough to make a real...
  7. Tobho Mott

    Iron Casting

    A12 is the size of the crucible I'm burning up doing cast iron :) The A in A12 stands for Aluminum and the 12 is in pounds. That's brim-full not actual usable capacity. Multiply that by 3 to get a crude approximation of how much iron or bronze it might be able to hold. The sizes are only...
  8. Tobho Mott

    Iron Casting

    @Wanderer has his own iron furnace, but I am eager to learn if I'm pouring iron that is machinable, and the art pours above aren't really going to tell me that. So yesterday I had him over and we poured some model train parts. For the most part it was molds he'd made at home and brought with...
  9. Tobho Mott

    The Great Ontario Foundry Road Trip, 2025

    I was able to buy a 50# bag of powdered Western bentonite from Wyoming several years ago from a company in Ottawa called CanPipe. The brand name is Quik-Gel, if it helps you track some down. Southern bentonite was harder to find in reasonable sized packages without making a trip to Milton...
  10. Tobho Mott

    Worn nuts for mill leadscrew

    Alloying bronze isn't something I have a huge amount of experience doing. I do know that molten copper oxidizes like crazy though, so in addition to keeping the burner tuned rich to create a slightly reducing furnace atmosphere, a scoop of small bits of charcoal was added to the crucible as the...
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