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Post by Deleted on Nov 3, 2016 13:18:01 GMT -6
For some reason (whether I bumped my calipers or what), when I threw the catcher for a piece I'd spent some time on perfecting, after bisque, the base of the pot ended up hanging over the edge of the riser about 3mm all around. Knowing it is better that the catcher is narrower than the pot base, rather than wider, my question is, how much narrower is acceptable? how badly is that 3mm overhang going to effect the flow of the glaze and/or my ability to break them apart after firing?
Can I just take an excess of my kaolin/glue mixture and fill in that gap and taper it downward to the riser shaft? Or do I need to try throwing a whole new catcher, trying to calculate the bisque shrinkage to get it right?
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Post by jerrysawitz on Nov 3, 2016 15:06:23 GMT -6
just my two cents but from my experience the catcher is as important as the piece.
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Post by Deleted on Nov 3, 2016 16:59:20 GMT -6
Thanks Jerry. I just realized that my idea of filling the space beneath the overhang with the glue/kaolin mix, like calking, wouldn't work anyway. When the glue burns off, the kaolin would probably just drop away allowing the glaze's surface tension to make it crawl under the lip. Oh well.
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bbucky
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Post by bbucky on Nov 3, 2016 22:49:56 GMT -6
I throw my catch basins 1mm smaller that the pot. The I use a 1/3 epk, 1/3 silica, 1/3 alumina hydrate mixture.
A 50/50 mix of silica and epk works great too. Clean edges on pot and base, use new clay, dress the base with a quick coat, place pot, band with mixture to the edge of the bevel of the pot and fill the gap. 98% clean base removal with this method using firm tap with kiln post or whatever. Never needed glue, a small amount of bentonite will stick like any glue.
Our work deserves great bases.
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Post by Deleted on Nov 4, 2016 10:36:37 GMT -6
Thanks for the added info. For several years now (but with only a few attempts at ^10), I've used one side of the friendly controversy here on the forum: 50/50 Elmer's carpenter's glue and EPK. To my recollections I've never had a bad separation with it. I seldom even have to tap the catcher, and must be careful to support it when I pull it from the kiln, since they tend to fall off if I don't.
I went ahead and attached the vessel in question and found the gap was only slightly less than 2mm, so I think I may be alright. I'll find out in about 10 minutes when I walk to the studio.
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