andrew casto on fri 24 nov 06
Lee...
Assuming you were sending to me here since that was John replying to my post. When I cast that door, I put plywood on either side of the opening, and put pastic in between the blocks that I cast and the walls. This worked to keep the blocks from bonding to each other, but as I mentioned before, there was no shrinkage in the castable at all...it may have expanded some. If I were to do it again, I would use some time of larger barier...maybe cardboard with plastic on the castable side? It might need to be something firmer, like 3/8 inch masonite to really work. Depending on the uniformity of the bricks in the top of the door this system could work there too. If the bricks are fairly uneven, you could cast the sides and the bottom with the aforementioned barrier, but just put the plastic between the top and the bricks. That would still give you a tight on the top, and allow you easy removal of the castable because of the fillers on either side and the bottom. I would think
it would drop out of the space fairly easily when you were done.
The castable I used was a low iron insulating castable called "wescolite 2600li" from wesco refractories in Fort Worth, Texas. I used it only because we got a good deal of it nearly for free. I would have just used bricks otherwise. A denser castable might react differantly or have differant shrinkage properties. I found that I could print a data sheet on my castable from the manufacturer's website that listed this info too. I did not however think to check that until after I realized my error in casting it against the bricks. Live and learn right?
Good luck man...
Andy
To: CLAYART@LSV.CERAMICS.ORG
From: Lee Love
Sent by: Clayart
Date: 11/22/2006 05:01AM
Subject: Re: casting side ports
On 11/22/06, andrew casto wrote:
> John,
>
> If you cast the plugs in place, make sure that you also add some sort of
> removable spacer between your plastic and the kiln. The castable likely
> will not shrink at all when it sets, and you may end up having the plugs
> stuck in kiln. I cast part of the door on my wood kiln the same way you
are
> suggesting.
John, I have been thinking about casting the top part of my door
that meets the arch. Can you tell me how you would cast your door
parts if you did it again? What was your castable?
--
Lee in Mashiko, Japan
http://potters.blogspot.com/
"Let the beauty we love be what we do." - Rumi
"When we all do better. We ALL do better." -Paul Wellstone
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