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  Topic: Foundry Tutorial Discussion
Daniel Rotblatt

Replies: 181
Views: 9796

PostForum: General foundry talk   Posted: Sat Jul 26, 2008 4:57 am   Subject: Foundry Tutorial Discussion
Just found this thread, and I've only had a chance to glance through it, but I am very impressed - it looks great! Although I wouldn't have expected less from you... Wink

I've also been working ...
  Topic: not so much of a furnace question as a forge question
Daniel Rotblatt

Replies: 54
Views: 3586

PostForum: Foundry engineering and construction   Posted: Wed Jul 23, 2008 11:31 pm   Subject: not so much of a furnace question as a forge question
I used a 50 lb harbor freight anvil for many years.
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=806
In retrospect it was too light and was a "cast iron anvil shaped objec ...
  Topic: not so much of a furnace question as a forge question
Daniel Rotblatt

Replies: 54
Views: 3586

PostForum: Foundry engineering and construction   Posted: Sun Jul 20, 2008 5:51 pm   Subject: not so much of a furnace question as a forge question
How do you keep the ceramic blanket and firebrick in place, or does it just "sit" in there by itself? What is kiln shelf made out of?

I put the brick on the bottom and cut the ceramic fi ...
  Topic: not so much of a furnace question as a forge question
Daniel Rotblatt

Replies: 54
Views: 3586

PostForum: Foundry engineering and construction   Posted: Sun Jul 20, 2008 5:16 am   Subject: not so much of a furnace question as a forge question
Welder is right, a forge is just a furnace on its side (or vice versa - depending on your point of view). I've made a number of forges - I used to forge knives and swords. I usually use ceramic blan ...
  Topic: not so much of a furnace question as a forge question
Daniel Rotblatt

Replies: 54
Views: 3586

PostForum: Foundry engineering and construction   Posted: Sat Jun 28, 2008 4:11 am   Subject: not so much of a furnace question as a forge question
Try Biringuccio's book: http://www.amazon.com/Pirotechnia-Vannoccio-Biringuccio-Sixteenth-Century-Metallurgy/dp/0486446433/ref=sr_1_1?ie=UTF8&s=books&qid=1214625258&sr=1-1

It was writte ...
  Topic: some model castings
Daniel Rotblatt

Replies: 23
Views: 1780

PostForum: General foundry talk   Posted: Sun Jun 15, 2008 4:21 pm   Subject: some model castings
Abby, I figured you had tried all of these - you've been doing this longer then I have. But...you never know. With ceramic shell I never get large bubbles - and never on a smooth surface such as you ...
  Topic: this is so wrong
Daniel Rotblatt

Replies: 18
Views: 1349

PostForum: General foundry talk   Posted: Sun Jun 15, 2008 6:43 am   Subject: this is so wrong
Gentlemen, I am an artist, and I take umbrage at your comments about my fellows!

Of course I'm also a strong advocate of Darwin.... Wink
  Topic: some model castings
Daniel Rotblatt

Replies: 23
Views: 1780

PostForum: General foundry talk   Posted: Sun Jun 15, 2008 6:22 am   Subject: some model castings
Abby, bubbles are a bitch. I did a life casting of a hand recently and at many of the hair follicles there were tiny little bubbles (maybe 1 mm) - I sat there for several hours with magnifying glasse ...
  Topic: Waxes and Burn times
Daniel Rotblatt

Replies: 33
Views: 1799

PostForum: General foundry talk   Posted: Wed Jun 04, 2008 7:24 am   Subject: Waxes and Burn times
I don't know off hand, but many years ago I used to buy cups and sprues from local foundries at a pretty low cost. With the prices of metals now I don't know it this would still apply. Worth calling ...
  Topic: Need Mold Help -> Gating Issue?
Daniel Rotblatt

Replies: 67
Views: 3890

PostForum: General foundry talk   Posted: Wed Jun 04, 2008 7:14 am   Subject: Need Mold Help -> Gating Issue?
You are approaching this with the positive attitude of a true scientist - negative results give as much information as positive ones. Wish my suggestions had resulted in a "fix" though.
...
  Topic: Waxes and Burn times
Daniel Rotblatt

Replies: 33
Views: 1799

PostForum: General foundry talk   Posted: Sun Jun 01, 2008 6:56 am   Subject: Waxes and Burn times
I've been getting it from Industrial Metal Supply Co, which is local here in L.A. so there is no shipping. I generally purchase smaller amounts, so the cost is higher, plus I haven't purchased in a y ...
  Topic: silver porosity
Daniel Rotblatt

Replies: 6
Views: 732

PostForum: General foundry talk   Posted: Sun Jun 01, 2008 6:45 am   Subject: silver porosity
This was sterling, but I mixed it myself from 99.9 ingots and copper wire. This piece was not a centrifugal casting, it was a ceramic shell casting - or actually two castings: the front piece is silv ...
  Topic: silver porosity
Daniel Rotblatt

Replies: 6
Views: 732

PostForum: General foundry talk   Posted: Sat May 31, 2008 4:17 am   Subject: silver porosity
When I used to cast jewelry I used a centrifugal caster, I imagine the centrifugal force caused so much pressure that bubbles are squeezed out. I recently cast a medallion out of silver (with a bronz ...
  Topic: Waxes and Burn times
Daniel Rotblatt

Replies: 33
Views: 1799

PostForum: General foundry talk   Posted: Sat May 31, 2008 3:56 am   Subject: Waxes and Burn times
Check a few other places for their shipping costs. For example, Arizona Sculpture supply will charge $14 (shipping to Battle creek) for a 10 lb slab- that's $44/1 slab. Not too crazy - 10 lbs of wax ...
  Topic: Waxes and Burn times
Daniel Rotblatt

Replies: 33
Views: 1799

PostForum: General foundry talk   Posted: Fri May 30, 2008 7:02 pm   Subject: Waxes and Burn times
Sure, bee's wax is the most traditional type of wax to use - greeks, romans, egyptians, asia...all the way back to the bronze age. Microcrystalline was developed as a less expensive synthetic version ...
 
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