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  1. Replies
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    Thanks for the input. Kept checking and seems...

    Thanks for the input. Kept checking and seems what I want is pottery plaster. It's made to be cast like slip casting and claims to be a little harder than plaster of paris. Ended up ordering 25 lbs....
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    Can plaster used for wall patch like this...

    Can plaster used for wall patch like this http://www.homedepot.com/p/DAP-25-lb-White-Plaster-of-Paris-Dry-Mix-10312/100123682 be used to pour into molds and air dried? I called DAP and they said to...
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    That stuff is getting rare and expensive. Makes...

    That stuff is getting rare and expensive. Makes really good cores too if you need better surface finish though 80 is not particularly fine mesh.
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    What's the shape of your pattern? Could it be...

    What's the shape of your pattern? Could it be done with lost foam?
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    Super Sculpey oven bake polymer clay. If its not...

    Super Sculpey oven bake polymer clay. If its not too thick and has a flat back. If there's empty space underneath it doesn't survive ramming too well.
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    Straight commercially milled bentonite, graded...

    Straight commercially milled bentonite, graded silica sand and measured water are good ingredients. I don't think home ground cat litter, playsand and guessing at the water content are good. Maybe OK...
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    When its dark out you can see the flame coming...

    When its dark out you can see the flame coming out the top of your furnace best. You got to be able to control fuel and air. Unless I got it backwards it's oxidizing if there's excess air so all the...
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    This wetted very well. Sometimes needed a little...

    This wetted very well. Sometimes needed a little massage with the brush. Ideally it would be great to have a whole vat of the stuff being stirred constantly to dip into like the big boys do but I'm...
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    I started this hobby with the greensand recipe...

    I started this hobby with the greensand recipe from foundry101.com, 50 lbs. silica sand, 6 lbs. bentonite, 1/2 gal. water. Need to thoroughly mix the dry ingredients first, like cooking. Worked...
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    Recipe #2 is from page 17 here....

    Recipe #2 is from page 17 here. http://cdn.intechopen.com/pdfs-wm/29758.pdf It's not dry wall mud but an industrial ceramic lost foam coating. So its much like what you suggested except you don't...
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    Very nice! Any pics of the inside?

    Very nice! Any pics of the inside?
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    I love the smell of styrene in the morning....

    I love the smell of styrene in the morning. Smells like . . . victory!

    Finally got back to this. Didn't finish any more foamies but cast my prototype with some other things including my last two...
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    Can't help you on the mpa-psi conversion. But on...

    Can't help you on the mpa-psi conversion. But on running the furnace, you'll only be able to burn so much gas with your naturally aspirated burner. It can only suck in air being pulled with the...
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    Here's another way to skin that cat. I welded...

    Here's another way to skin that cat. I welded steel rod inside the lid. Then hit it with exhaust pipe paint.
    http://www.alloyavenue.com/vb/attachment.php?attachmentid=11567&d=1408814553
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    I'd be more interested in figuring how to make my...

    I'd be more interested in figuring how to make my own hollow foamies actually. Thank you for the offer, though. I still think a sprue down the outside to the bottom will help. Just have to grind it...
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    Playsand is about $5.70 to $6 for 50lbs near me....

    Playsand is about $5.70 to $6 for 50lbs near me. 120 grit silica sand from a building supplier is $12/100 lbs. So really the same price but much better quality. Check your prices, you might be...
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    I thought that when I built my furnace and...

    I thought that when I built my furnace and myfordboy has a great example of that. But when I finished my furnace the top edge of blanket was left exposed thinking I'd cover it with more refractory...
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    I didn't know factory work used to require...

    I didn't know factory work used to require wearing a tie.


    https://www.youtube.com/watch?v=2Lak64SAaIY
  19. Definitely heed the Al grinding warnings! The...

    Definitely heed the Al grinding warnings! The best tip I ever got on grinding aluminum was from BobS' post about polishing aluminum. FORMAX F-90! I usually grind Al with a grinding wheel on an angle...
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    The reason I asked is because I split them...

    The reason I asked is because I split them lengthwise like you said and then jammed on side into the other. But after a few uses the steel wasn't too springy any more and one popped open while...
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    I phrased that wrong. How do you get the steel...

    I phrased that wrong. How do you get the steel tubing risers off the aluminum plug at the top of the casting? Or does the Al shrink enough to fall out?
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    Good test there. Your sprue/core works well. I...

    Good test there. Your sprue/core works well. I was surprised to see cracks on the outside of your coated pattern though. The smooth rounded shape of your flaws look like the metal being too cool from...
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    Yep I mixed them up. My brain fart. X is not...

    Yep I mixed them up. My brain fart. X is not expanded and E is not extruded. Quite confusing.
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    I think you're mixing up me and sandcrab re....

    I think you're mixing up me and sandcrab re. coating recipe #2. Rubbery gelatin doesn't sound like what I experienced but I think you need to add water to suit your purpose. It is tough to wet the...
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    I love the mother of invention. Great work! Looks...

    I love the mother of invention. Great work! Looks like a lot more than printing goes on in your shop.
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