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Min

Member Since 31 Mar 2010
Offline Last Active Sep 26 2016 11:37 AM
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Posts I've Made

In Topic: Multiple Clay Explosions In Bisque

26 September 2016 - 11:19 AM

pssst, air bubbles don't blow up pots. Damp pots do. Set your kiln sitter for 12 hours,  turn on the bottom element to the lowest setting and leave the peeps out. If you are making regular thickness pots then try this candling overnight or at least for a few hours. (don't forget to turn the dial on the sitter back up again before you bisque fire so it doesn't time out)

 

edit: I just re-read your second post, I missed this bit the first time:  "For a smaller kiln I think an hour per each switch is plenty of enough time to warm up and let any extra moisture escape" doesn't matter what size the kiln is the clay still has to go through the same processes, think you are firing too fast also. 


In Topic: Crazing With Commercial Glazes And Bisqueware?

25 September 2016 - 05:06 PM

Hmmm, couple thoughts if I may. Just so we are all on the same page here, could you post your firing schedule, confirm this is low fire bisque and if you know what cone to which it was bisqued. Have you measured the porosity of the clay after firing? That second pot looks like it has soaked up water.

 

It's very difficult to get a non crazing clear for low fire. If you have a porous body (just about all low fire is) it will just be a question of time before you get crazing. The oven/water test just sped up what would have happened eventually. Any chance you could use stoneware bisque and fire cone 6? Much easier to get glazes to fit without crazing. 

 

It takes time to get clay and glazes the way you want them. I can't help but think that it might be better to really get this worked out then make the restaurant order, if that means missing a deadline or a sale then so be it. You will sleep better at night knowing you have made a good product.


In Topic: Low Fire White Clay Body Recipe For Commercial Glazes

23 September 2016 - 02:27 AM

I think this is getting way more complicated than it needs to be.

 

Totally Ceramics does slip casting with low fire white clay, they are local, they have years of experience, I would just go in and talk to them.

 

Greenbarn can order in anything from Plainsman, they are one of their distributors. 

 

Seattle Pottery Supply is a much larger store than Tacoma Clay Arts Center but I'm guessing they both carry only a few casting slips. Both good places, SPS is usually a bit less expensive than Tacoma but I find Tacoma staff are more helpful. Nope, I haven't used that Laguna slip.

 

A vitrified body, like what Joel posted, is not necessary for the sculptural work you are doing, will cost a lot more to make and bring far more variables into play. I'm sure it has possibilities as would Nerd's recipe but do you really need to start experimenting with it when you are new to all this?


In Topic: Low Fire White Clay Body Recipe For Commercial Glazes

21 September 2016 - 11:21 PM

Actually there is another place in the Vancouver area, http://www.totallyceramics.com/ They make their own slipcast wares to sell, (also sell bisque) upstairs is their production area. They have an extensive low fire glaze selection plus the materials for slipcasting. Their website sucks, they don't have most of the stuff they carry listed there. This is their new location, been there about 5 years or so but have been around for ages in their old place. This would be my first spot to go for slip casting supplies in this area.

 

Greenbarn carries Laguna Whitestar casting slip ^04, page 10 on this link http://www.greenbarn... SLIPS 1_10.pdf

 

In Seattle there is a large ceramics place Seattle Pottery Supply, then about 30 minutes south is Tacoma Clay Art. SPS has a wider range than Tacoma but I find the people more knowledgable in Tacoma.


In Topic: The Only Absolutely True Rule For Potters. Pay Attention To This

21 September 2016 - 08:02 PM

Another absolute truth, if you have a custom order for a pot and just make 1 of it, it will screw up, if you make 2 they will both be perfect. I know this and yet I still go for it (1 oversized butter dish custom order right now, yup just made the 1 :wacko: )