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potterbeth

Member Since 13 Feb 2013
Offline Last Active Nov 12 2014 08:49 AM
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Posts I've Made

In Topic: Why A Knocking Noise

07 November 2014 - 08:47 AM

I've also had this happen when the splash pan was pushed too far off center...


In Topic: Application Of Glaze To Nearly Vitrified Clay

05 November 2014 - 10:31 AM

Low fire pottery is usually bisque fired to a higher temperature than its glaze temperature (bisque to 04 and glaze to 05-06). Bisque firing to cone 04 ensures that organics in the clay have burned out so they don't cause problems during the glaze firing, and any clay shrinkage has already occurred before the glaze firing so the glaze does not have to shrink to fit the clay. Plus the clay is still porous and can absorb the glaze.

 

The good news here is that you probably won't have any fit problems in applying and firing the glaze on your cone 5 fired piece. However, if your piece has become non-porous at cone 5, applying the 05 glaze will be more difficult. Commercially produced glaze purchased as wet mix usually contains enough gum to allow a decent coating, but it may not go on as thick as it would on bisque which could affect the color and texture of that glaze.

 

Additionally, your cone 5 glaze may be affected by the re-fire at cone 05. I've seen both good and bad results. Until you finish one of these pieces, you won't know for sure what you will get. So, moving forward, some test tiles in your clay body using your glazes might be desirable. Otherwise, your work is the test.

 

Finally, some low fire glazes do not respond well if they are fired in a kiln with work being bisque fired. Once again, I've seen both good and bad results. So your tests should take this into consideration.

 

Have fun!


In Topic: Firing Error And Bloating

03 October 2014 - 09:09 AM

I use Standard 266 (dark brown clay body, no grog), bisque to cone 06 and glaze to cone 5. Even then, I will occasionally get a bloated piece, particularly with one glaze. But the beauty of the rest of the work makes the risk worth it. I know of another studio using the same clay body that had horrible bloating problems at cone 5...but they were firing a low bisque at cone 010. Just another factor to consider.


In Topic: Speedball Artista Pottery Wheel - Good Or Not ?

28 September 2014 - 08:53 AM

Thanks for the info on the redesigned IE. It sounds as if it has been beefed up. I could easily move the one we had by myself, albeit awkwardly. The removable legs sound like an interesting feature.


In Topic: Speedball Artista Pottery Wheel - Good Or Not ?

26 September 2014 - 08:47 AM

Regarding less expensive floor model wheels, while I LOVE Brent wheels, the IE almost too light-weight. We bought one for a community studio and pretty much decided it would be our demo wheel. The Clay Boss is built a little heavier, and we have one in the studio, but it is always the last wheel chosen for use...except for left-handers because it is easily reversible while most of our other wheels are right-handed only. If you have the money, go for a Brent C or CXC or a Shimpo VL-Whisper.