ronfire Posted May 26, 2015 Report Share Posted May 26, 2015 Just ran my 2nd glazing and had a strange issue. Had a full kiln with about 20 pots and 4 of them had the standoffs warp and embed into the pot base. They look like the warped and sagged over but the cones indicate a little hot for a cone 6 but not a full cone 7( still learning to tweak the sitter). All the pots turned out good and most stands did not have a problem.I managed to break the stands off with a chisel and distorting the standoff but saved the pots. Any idea why only a few had issues and with only a max of cone 7 at the most. Link to comment Share on other sites More sharing options...
Mark C. Posted May 26, 2015 Report Share Posted May 26, 2015 What are the stands? Are you speaking of the 3 point ceramic tips ones or metal tipped ones or something else? Mark Link to comment Share on other sites More sharing options...
Pres Posted May 26, 2015 Report Share Posted May 26, 2015 If you are talking about kiln stilts, ^6 is a little high for them. If they are metal in a ceramic base, ^6 is definitely too high with any sort of weight on them. Link to comment Share on other sites More sharing options...
oldlady Posted May 27, 2015 Report Share Posted May 27, 2015 show us a picture of what you are calling a "standoff". if it is a stilt, they are used on earthenware so glaze can be put on the bottom of the pot. the stilt keeps it above the shelf so it does not stick. Link to comment Share on other sites More sharing options...
Marcia Selsor Posted May 27, 2015 Report Share Posted May 27, 2015 when you fire to a hotter temperature the clay shrinks another 7% or so depending on the clay The slits do not shrink. This causes the warping and other problems. The metal can get soft at that temperature as well. depends on the type of stilt. Marcia Link to comment Share on other sites More sharing options...
Denice Posted May 27, 2015 Report Share Posted May 27, 2015 It's probably your stilts, I never use any stilts on C6 work, it could be your clay. I was using a locally made clay when it started warping and slumping at C6 that was slightly over fired. I questioned my supplier and it turns out that the clay was really a C5 but being sold as a 5/6, I still use it but I understand it's limits. Denice Link to comment Share on other sites More sharing options...
ronfire Posted May 27, 2015 Author Report Share Posted May 27, 2015 Sorry I guess I should call them stilts . Here is a picture of one that warped. I had 4 of them like this out of 24. Reading up on them it looks like they can not take any heat above ^6. Guess I may have been luck that there was not more problems when I had the slight overfire. I will have to adjust my sitter cone and latch a little more, all the fires so far had been about ½ a cone low except this time. Link to comment Share on other sites More sharing options...
Pres Posted May 27, 2015 Report Share Posted May 27, 2015 I suggest that you use bars instead of mini cones for your setter. It is much more consistently accurate to place the bar without having thickness variations of a cone. This may help quite a bit. Link to comment Share on other sites More sharing options...
oldlady Posted May 27, 2015 Report Share Posted May 27, 2015 where did you get the idea to use them? not criticizing, just wondering where the info came from. your pot was not glazed on the bottom so it should have been OK right on the shelf. why did you stilt it at all? new glaze?? Link to comment Share on other sites More sharing options...
ronfire Posted May 27, 2015 Author Report Share Posted May 27, 2015 Not sure where I read to use stilts on the glazed pots in case they drip. So it is then best not to use the stilts if you do not glaze the bottoms? Just make sure the shelves have kiln wash on them? Sorry about all the basic errors and questions, just new to this . My wife does the clay work and I run the Kiln for her. Link to comment Share on other sites More sharing options...
oldlady Posted May 27, 2015 Report Share Posted May 27, 2015 yes, kiln wash will save your shelves. there are times you would want more protection, like using a glaze for the first time. stilts are really for lower temperatures. we know what you mean but a basic knowledge of our special terms and odd words would help. getting that knowledge is not easy unless you have access to a good general book with a glossary. maybe your wife can let you look at her library. you are what many of us wish for, someone to do the "other" stuff that keeps us from touching clay. Link to comment Share on other sites More sharing options...
Mark C. Posted May 27, 2015 Report Share Posted May 27, 2015 wash your kiln shelves and do not use these stilts for cone 5 or cone 6 work They are made for cone 06 work. You will not need them. Mark Link to comment Share on other sites More sharing options...
Chantay Posted May 27, 2015 Report Share Posted May 27, 2015 When using a new untested glaze I use small flat plates that I put kiln wash on to prevent drips on the shelf. The are reusable numerous times. Link to comment Share on other sites More sharing options...
ronfire Posted May 28, 2015 Author Report Share Posted May 28, 2015 Thanks for the advise,it will make loading a lot easier. I have not had the glaze we use run yet so I should have no issues. Link to comment Share on other sites More sharing options...
TwinRocks Posted May 29, 2015 Report Share Posted May 29, 2015 The stilts with wire points are (as far as I know) always low fire. If you want to fire to cone 6, their are high fire stilts ade from porcelain that are supose to handle that temprature. I have pepper seeds sprouting in a nice, big bowl with a low fire stilt fused into the bottom, so you are not the only one to learn the hard way! Link to comment Share on other sites More sharing options...
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