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  1. Replies
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    Have a link to an example of one of these? ...

    Have a link to an example of one of these?

    Best,
    Kelly
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    The change in resistivity for either NiChrome...

    The change in resistivity for either NiChrome 80/20 or Kanthal is on the order of 5-6% from room temp to recommended furnace operating temperatures. Some of the other typical alloys used for...
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    Unless you have a lab grade decade box and...

    Unless you have a lab grade decade box and standards I think you'll find measuring that resistance to be very difficult. The resistance in the probes for most common ohm meters is comparable to the...
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    Can't argue with that. Please post progress. ...

    Can't argue with that. Please post progress.



    Would like to know more about that. Will send you a PM.

    Best,
    Kelly
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    Don’t mean to be an alarmist and like I said,...

    Don’t mean to be an alarmist and like I said, probably noproblemo, but just a thought and before you place a bunch it might be worth a look. That pressure test sounds like a good idea…..ya-know, an...
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    Nice SLC. I own SLC #50. It’s a street car with...

    Nice SLC. I own SLC #50. It’s a street car with street tail, LS376 and Ricardo TA.


    http://i398.photobucket.com/albums/pp62/kcoffield/SLC%20at%20Home_zpsgofvjkrc.jpg

    I didn’t build it. Allan...
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    David, Nice looking pattern work and parts....

    David,

    Nice looking pattern work and parts. Just wondering if you’ve managed to get any sets in service and if they are fluid tight. At a fairly uniform ¼” wall I suspect not a problem but I ask...
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    That's an ambitious project. I have midengined...

    That's an ambitious project. I have midengined cars. -2 ZFs and Ricardo TAs but familiar with many others. The sample part in your hand at your link looked like a smaller part. Is it a full size or...
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    Mugs from cartridge shells sound pretty cool....

    Mugs from cartridge shells sound pretty cool. Instead of making the insulation a permanent feature how about just an insulated insert that is removeable and slides in and out of the mug? Like maybe a...
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    I documented my first experiences with castable...

    I documented my first experiences with castable refractory starting here at post #68 & #69
    http://www.alloyavenue.com/vb/showthread.php?12107-Kelly-s-Furnace-Build-Log/page7

    And then the most...
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    Sure. On the first bit of experimenting and...

    Sure.

    On the first bit of experimenting and test piece, I just took a piece of scrap ¼” tube and fed it through my slip roll until it was the diameter that landed on the CG of the crucible. Then...
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    Brian nicely executes his concept. I suspect his...

    Brian nicely executes his concept. I suspect his mechanism provides some mechanical advantage but it appears if you don’t maintain the squeeze on the lever you could drop the crucible. I would think...
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    4 cavity pattern/mold? Are you going into...

    4 cavity pattern/mold? Are you going into production?

    Best,
    Kelly
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    marcaap, Great build and very nicely executed....

    marcaap, Great build and very nicely executed. What size crucible are you using and happen to have some pictures of your tongs/pouring shank?

    Best,
    Kelly
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    Having both built your own rigs, would you happen...

    Having both built your own rigs, would you happen to haveany suggestions on sources for components and maybe web forums where I couldget up to speed on building my own? I’d be looking for the...
  16. Thread: Lost Foam Qs

    by kcoffield
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    232

    Thanks for the comments. I'm planning on making...

    Thanks for the comments. I'm planning on making multiple foam patterns and experimenting.

    Thanks for the (duck decoy) lead on the unexpanded beads Peedee. I'll check that out. I had previously...
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    I’ll do that though it may be a while yet. Two...

    I’ll do that though it may be a while yet. Two years ago when I built onto my shop I had a 2” NG line run from the primary service line. I asked to have an auxiliary tap installed outside where the...
  18. Thread: Lost Foam Qs

    by kcoffield
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    6
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    232

    Lost Foam Qs

    I’m pretty well set up with furnace and molten metal handling ability now but not so much on mold making materials and equipment. So I figured I’d like to try a couple lost foam castings and had a...
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    No plutonium.........Fusion reactor with flux...

    No plutonium.........Fusion reactor with flux capacitor!

    K
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    Furnace Build Update 2-21-2017 - Lifting Crane ...

    Furnace Build Update 2-21-2017 - Lifting Crane

    So I finally got around to making the Crane arm, carriage, and lifting hardware. I had originally placed the mounting plate at the top of the mast on...
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    Well, not (yet) a wax/shell guy, but would like...

    Well, not (yet) a wax/shell guy, but would like to get there in the future.

    If the objective is to recover wax, wouldn’t the first order of business be to add temperature control to the kiln so...
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    As an alternative, could you just build a base...

    As an alternative, could you just build a base follower for it to sit on so the legs will more or less pull and then remove the follower and complete the cast. Might stand a better chance of keeping...
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    Sort of takes some of the fun out of building a...

    Sort of takes some of the fun out of building a blower for your impeller though




    If it was well designed the optimal impeller port sizes are dictated by the impeller characteristics and vice...
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    r4z0r, if that motor doesn't work out here's a...

    r4z0r, if that motor doesn't work out here's a possible alternative.
    ...
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    Universal Motor - These days pretty much every...

    Universal Motor - These days pretty much every shop vac, router and higher rpm woodworking tool 15 amps or less.....and many others

    https://en.wikipedia.org/wiki/Universal_motor

    Best,
    K
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