steff p Posted November 3, 2022 Report Share Posted November 3, 2022 Hi guys, Im making this mirror frame out of heavily grogged clay there are 6 of the ‘braces’inside (see photo) Someone mentioned dragging as it shrinks whilst firing- any thoughts? I can make setters or a giant ‘plate’ out of the same clay to go in the firing? Its about 18inches in diameter any advice would be appreciated thanks so much stef Quote Link to comment Share on other sites More sharing options...
Bill Kielb Posted November 3, 2022 Report Share Posted November 3, 2022 (edited) my thought- This would be a candidate for a cookie or waster underneath for me and alumina at the intersection of all junctions so nothing binds as it shrinks, above and below the cookie. Setting this on paper towels or newspaper as it dries definitely let’s it shrink nicely as it dries as well. Fire on a nice flat straight shelf. Edited November 3, 2022 by Bill Kielb Quote Link to comment Share on other sites More sharing options...
steff p Posted November 3, 2022 Author Report Share Posted November 3, 2022 great - thanks so much for that! Quote Link to comment Share on other sites More sharing options...
oldlady Posted November 3, 2022 Report Share Posted November 3, 2022 love the tool holders at the edges. why "heavily grogged" clay? i would use just a layer of grog on a totally flat shelf. remember, if the clay warps into a crooked shelf it will not be flat enough for the glass. Quote Link to comment Share on other sites More sharing options...
steff p Posted November 3, 2022 Author Report Share Posted November 3, 2022 2 hours ago, oldlady said: love the tool holders at the edges. why "heavily grogged" clay? i would use just a layer of grog on a totally flat shelf. remember, if the clay warps into a crooked shelf it will not be flat enough for the glass. The clay body i like to use for hand building is ‘heavily grogged’ A layer of grog sounds like a good idea/ I thought grogs were only used in the clay body and didn’t know they could be used like this? I suppose its like gravel and it will ‘move’ in the kiln ? Would you know what mesh would work best? Quote Link to comment Share on other sites More sharing options...
steff p Posted November 3, 2022 Author Report Share Posted November 3, 2022 15 hours ago, steff p said: Hi guys, Im making this mirror frame out of heavily grogged clay there are 6 of the ‘braces’inside (see photo) Someone mentioned dragging as it shrinks whilst firing- any thoughts? I can make setters or a giant ‘plate’ out of the same clay to go in the firing? Its about 18inches in diameter any advice would be appreciated thanks so much stef @bciskepottery i saw you replied to a similar post to this and mentioned grog as one solution and coils as another - can you elaborate on the coil method? Eg where they would sit and how many? thanks Quote Link to comment Share on other sites More sharing options...
steff p Posted November 3, 2022 Author Report Share Posted November 3, 2022 11 hours ago, Bill Kielb said: my thought- This would be a candidate for a cookie or waster underneath for me and alumina at the intersection of all junctions so nothing binds as it shrinks, above and below the cookie. Setting this on paper towels or newspaper as it dries definitely let’s it shrink nicely as it dries as well. Fire on a nice flat straight shelf. Hi there, me again- can you just use alumina on its own or would you definitely use a waster? thanks Quote Link to comment Share on other sites More sharing options...
Bill Kielb Posted November 3, 2022 Report Share Posted November 3, 2022 I think I would use both and that’s me just being extra cautious. To me It looks heavy and the edges will bear firmly on what they are placed upon. It’s a nice piece, wouldn’t want it to get caught on anything. Callie Beller Diesel 1 Quote Link to comment Share on other sites More sharing options...
steff p Posted November 4, 2022 Author Report Share Posted November 4, 2022 thanks will make the waster now, i will place it under something heavy and flat too Quote Link to comment Share on other sites More sharing options...
neilestrick Posted November 4, 2022 Report Share Posted November 4, 2022 I'd use a waster slab. Put some alumina wax on it so they don't stick together. The waster doesn't have to be very thick at all, and it doesn't have to be in one piece, so don't worry if it cracks. Rae Reich 1 Quote Link to comment Share on other sites More sharing options...
steff p Posted November 4, 2022 Author Report Share Posted November 4, 2022 great thanks so much Quote Link to comment Share on other sites More sharing options...
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