terrim8 Posted October 7, 2019 Report Share Posted October 7, 2019 Hi, I want to fire a bowl on its rim and not get any distortion - is using a waster how this is done? Link to comment Share on other sites More sharing options...
Callie Beller Diesel Posted October 7, 2019 Report Share Posted October 7, 2019 I used to fire a soup bowl design rim to rim and got more warping that way than when I just put them rim down on the shelf. But some of that’s is going to depend on your clay, I bet. Link to comment Share on other sites More sharing options...
Min Posted October 7, 2019 Report Share Posted October 7, 2019 1 hour ago, terrim8 said: Hi, I want to fire a bowl on its rim and not get any distortion - is using a waster how this is done? That's how I do the lids for my domed butter dishes (which are basically an upside down bowl with a knob on top). I make the wasters donut shaped so I don't use as much clay as they would with a pancake shape. Link to comment Share on other sites More sharing options...
terrim8 Posted October 7, 2019 Author Report Share Posted October 7, 2019 Thanks! That's what I wanted to hear- the voice of experience!!! Link to comment Share on other sites More sharing options...
terrim8 Posted October 7, 2019 Author Report Share Posted October 7, 2019 3 hours ago, Callie Beller Diesel said: I used to fire a soup bowl design rim to rim and got more warping that way than when I just put them rim down on the shelf. But some of that’s is going to depend on your clay, I bet. Hopefully if they're on the flat waster, on a flat shelf, it won't warp! Link to comment Share on other sites More sharing options...
liambesaw Posted October 7, 2019 Report Share Posted October 7, 2019 16 minutes ago, terrim8 said: Hopefully if they're on the flat waster, on a flat shelf, it won't warp! As long as there's no memory or pyroplasticity issues, nothing like a forgotten bump or an untwisting of clay to frustrate Link to comment Share on other sites More sharing options...
Bill Kielb Posted October 8, 2019 Report Share Posted October 8, 2019 7 hours ago, liambesaw said: As long as there's no memory or pyroplasticity issues, nothing like a forgotten bump or an untwisting of clay to frustrate Plastic deformation and temperature related strain? I almost don’t know you anymore! LOL. Slumping? Link to comment Share on other sites More sharing options...
liambesaw Posted October 8, 2019 Report Share Posted October 8, 2019 It's amazing what a kiln load of frustrating results will inspire you to research. Just wait for my current rabbit hole to finish up, it'll be a doozie. Link to comment Share on other sites More sharing options...
Rae Reich Posted October 8, 2019 Report Share Posted October 8, 2019 Thicker walls and rims (sturdy rather than delicate) will help, as long as there's been no distortion before drying. Link to comment Share on other sites More sharing options...
terrim8 Posted October 9, 2019 Author Report Share Posted October 9, 2019 Anything else? Such as use the same type of clay or any other tips??? Link to comment Share on other sites More sharing options...
liambesaw Posted October 9, 2019 Report Share Posted October 9, 2019 32 minutes ago, terrim8 said: Anything else? Such as use the same type of clay or any other tips??? Yeah, use the same clay for the waster, bisqued to the same temperature as your bowl. Link to comment Share on other sites More sharing options...
neilestrick Posted October 9, 2019 Report Share Posted October 9, 2019 4 hours ago, liambesaw said: Yeah, use the same clay for the waster, bisqued to the same temperature as your bowl. You don't have to bisque fire waster slabs. Just make sure they're dry. And put a coat of alumina wax on them so the pots won't stick. Link to comment Share on other sites More sharing options...
liambesaw Posted October 9, 2019 Report Share Posted October 9, 2019 36 minutes ago, neilestrick said: You don't have to bisque fire waster slabs. Just make sure they're dry. And put a coat of alumina wax on them so the pots won't stick. Won't they shrink under the bisque? My clay shrinks quite a bit during the bisque firing Link to comment Share on other sites More sharing options...
neilestrick Posted October 9, 2019 Report Share Posted October 9, 2019 25 minutes ago, liambesaw said: Won't they shrink under the bisque? My clay shrinks quite a bit during the bisque firing Most clay bodies I've used shrink very little during bisque. Plus my theory is that the pot isn't going to be hot enough to deform by the time the waster catches up. Link to comment Share on other sites More sharing options...
liambesaw Posted October 9, 2019 Report Share Posted October 9, 2019 8 minutes ago, neilestrick said: Most clay bodies I've used shrink very little during bisque. Plus my theory is that the pot isn't going to be hot enough to deform by the time the waster catches up. Ahh, gotcha Link to comment Share on other sites More sharing options...
terrim8 Posted October 9, 2019 Author Report Share Posted October 9, 2019 2 hours ago, liambesaw said: Won't they shrink under the bisque? My clay shrinks quite a bit during the bisque firing I have a bunch of clay disks drying between planks right now. I can use kiln wash too, right?(never heard of alumina wax- is it alumina hydrate and cold wax?) Link to comment Share on other sites More sharing options...
liambesaw Posted October 9, 2019 Report Share Posted October 9, 2019 You can use kiln wash. Alumina wax is alumina and cold wax, yes. It's just to keep things like fired-on lids from sticking or to keep feet from plucking. It's like a mild kiln wash, it won't stop glaze. Link to comment Share on other sites More sharing options...
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