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Thread: Building my first furnace

  1. #81
    Quote Originally Posted by J. Vibert View Post
    I'm going to use my 3 kids as an excuse as well if you don't mind....lol. Ya, but seriously, family life has a way of killing hobbies. I'm still not done that Beaver jointer believe it or not. Actually started learning this casting stuff to make parts for the project.
    I'm betting on at least one of my 3 boys being a hands-on kinda guy who will become a shop monkey for me, thus allowing more time for hobbies.

    I ended up selling my jointer! Did end up getting a metal lathe, though, so a worthy trade. Your jointer build thread was epic, and very inspiring. I def took the time to read - but I also get the video aspect. Downside of video is that in the shop, I find reading faster than watching, so having a few threads open with info is far more useful than a video. The videos are great for the late-night research sessions.

  2. #82
    Update!

    Tuyere tube patch
    It'll do. Not great, but should work. I cleaned up the cruft after taking this picture.


    Cut down the body flat
    Actually went really well - used a tile cutting wheel on the angle grinder, went through the refractory like it was butter.



    Coming together


    Long story short (because my last post was eaten by the forum), here are the next steps:
    • Fill with sand (figure on 4-5 bags)
    • Widen hole in original lid so the refractory lid can lift out
    • Cut original lid down flush, weld in place, weld in something to keep the sand in
    • Fabricate a hoop with mechanical locks (like a rib in the middle) for the refractory lid
    • Fabricate lid lifting mechanism
    • Set everything on fire!

  3. #83
    Senior Member Jammer's Avatar
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    You may consider filling the void with vermiculite as an insulator. Maybe mix some sand and vermiculite to make it more stable. The sand would end up in the bottom. Pearlite could be an option too, it would breakdown from the heat and may need to be replaced in a year or two. Kaowool would be great but expensive.

    Here's my furnace I built 9 years ago. still have it, just haven't used it much since I don't have that big of projects. Very similar to yours, I packed the outside with ceramic blanket I found in an old foundry my employer bought and tore down.

    http://www.alloyavenue.com/vb/showth...Finally!/page2

  4. #84
    Yeah, I did consider other options. I figured that if the sand did not work out (like, let through too much heat), I could always pull it out and use it either for a safety floor, or the kids sandbox needs topping up... Kaowool I could not justify this time around. but it's definitely the best route.

    Took a look at your build thread, cool! Additional kick in the pants to get it done.

  5. #85
    Kaowool is stupid money on fleabay... Average prices 10-15 PER FOOT of 24" wide stuff.....
    I get it here http://www.armadilloclay.com/j-k.html Under 4bucks a foot.

    Look at this THIEF! WOW https://www.ebay.com/itm/Kaowool-Ceramic-Fiber-by-UniTherm-2300F-1-x-24-x-24-FAST-FREE-US-SHIPPING/272967093591?hash=item3f8e1b4d57:gxAAAOSw6RFZjMuV
    WWW.TheHomeFoundry.org
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    "Sometimes by losing a battle you find a new way to win the war"
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  6. #86
    Quote Originally Posted by jagboy69 View Post
    Kaowool is stupid money on fleabay... Average prices 10-15 PER FOOT of 24" wide stuff.....
    I get it here http://www.armadilloclay.com/j-k.html Under 4bucks a foot.
    As long as you order it from a US seller, yes on most cases due to ripoff shipping costs. Get it from a Chinese (or EU) seller, same wool, much cheaper.

  7. #87
    Ya, when I was figuring out the sq.ft. I needed, the numbers were bordering on 'buy an entire roll' (I had wanted to do double or triple layer), so I gave up. I need maybe $30-40 of sand (retail box store high price sand, at that) - a far cry from the $200-300 it'd cost for kaowool.

  8. #88
    Senior Member Jammer's Avatar
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    http://shop.dsindustries.us/Ceramic-...ets-s/2041.htm

    I've contacted these people a couple time, I haven't ordered from them but they send me announcements on deals. Best one is scrap pieces by the bag. But, 50 sq ft for $51 is hard to beat. Of course you have to add shipping if they aren't close to you. So, Canada makes it tough.

  9. #89
    Much searching turned this up: https://www.aliexpress.com/item/24-x...StoreLevelAB=3

    search term: high temperature blanket

    Equiv of $9CAD/sq.ft. shipped. IIRC I needed like 25 sq.ft., so that'd be same price as a locally-sourced roll...plus 3-4mo delivery times. If y'all have suggestions for better places to get this stuff, I'm open, but it'd be for the next furnace.

    - - - Updated - - -

    Whoa, dats crazy. Still way cheaper than what I'd expected otherwise. But still way more expensive than sand.

    Edit: Yeah, that link Jammer posted - for a single roll of 50sq.ft., it's $140USD shipping (cheapest option), plus border fees/brokerage (prolly another $50), plus conversion to CAD. Still ~$300.

  10. #90
    Senior Member Jammer's Avatar
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    Ouch! Ouch!

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