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Type: Posts; User: cactusdreams

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  1. Replies
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    The mullite coating worked better for me when I...

    The mullite coating worked better for me when I needed some structural strength. It doesn't crack as easy with those squiggly leaks. Also to help sprues from collapsing. But surface is similar to DW....
  2. Replies
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    I've used this competitor to ITC-100 with good...

    I've used this competitor to ITC-100 with good success. HYB-UV It's $25/pint. Scroll to the bottom of the link.

    http://www.hybridburners.com/products.html
  3. Replies
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    9,909

    Ambient light makes a huge difference in how hot...

    Ambient light makes a huge difference in how hot things look. Especially in the red and low orange range. Effects seeing your flame too. I can't even see my flame in bright daylight.
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    I live near the L.A. (actually Sun Valley)...

    I live near the L.A. (actually Sun Valley) location. Love to go there and just look around pretending I need something. They have a large selection of patina materials too.
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    Took a look at one of his other vids and saw this...

    Took a look at one of his other vids and saw this burner flame. What's up with that? Sure seems to have plenty of shells though....
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    607

    Can't explain the water bucket or nitrogen but...

    Can't explain the water bucket or nitrogen but open face lost foam brass in petrobond is a new one on me.
  7. Replies
    167
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    8,178

    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....
  8. Replies
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    8,178

    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...
  9. Replies
    196
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    9,909

    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.
  10. Replies
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    1,741

    What's the shape of your pattern? Could it be...

    What's the shape of your pattern? Could it be done with lost foam?
  11. Replies
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    569

    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.
  12. Replies
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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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    583

    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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    1,008

    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...
  17. Replies
    196
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    9,909

    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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    583

    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
  21. Replies
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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
  25. 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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