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Ginny C

Member Since 02 Apr 2010
Offline Last Active May 03 2016 09:16 AM
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Posts I've Made

In Topic: Large Platter Broke In Half In Bisque Firing. Anything To Do With It?

30 April 2016 - 07:55 PM

OH!  Just make little balls of clay and put them underneath?!  What fun!  How far apart...I'm guessing about 1 inch apart...so 8-10 for a platter with about 4-5 inches diameter  flat area on the bottom?

ginny

( I love the interest in this, and the advanced scientific discussion some of you have brought into it!)


In Topic: Large Platter Broke In Half In Bisque Firing. Anything To Do With It?

30 April 2016 - 07:42 PM

 

I set it for cone 5 (but when I use a witness cone it shows cone 6 was reached) and I usually choose slow or medium speed, but this time I used Fast...maybe that was the problem!!?? 

 

 

Are you saying you fast-fired to ^5 for a bisque firing?  Or do you mean to ^05?

 

If you fast-fired to ^5 from greenware I'm not surprised it cracked.

 

Chilly,  Oh good grief. Sorry !  I was just talking about my glaze firings there..and the fact that the kiln slightly overheats.  The bisque firing under discussion here was to cone 04!  Sorry for the confusion.

ginny


In Topic: Large Platter Broke In Half In Bisque Firing. Anything To Do With It?

30 April 2016 - 10:25 AM

Chris, Yes, it's sharp! Would take a lot of grinding to not look like just a broken piece! And, Babs...maybe a garden piece is a good idea. :D

Nerd & Chris, thank you for all that explanation!  I've never tried to use my kiln without just the built-in settings. It's an Excel with a Select Fire board.  I set it for cone 5 (but when I use a witness cone it shows cone 6 was reached) and I usually choose slow or medium speed, but this time I used Fast...maybe that was the problem!!?? 

 

It looks like about 6 inches of the platter rested on the shelf. (No foot ring on this piece.)

 

I will order silica for future attempts. Please tell me which kind to get, as I see 4 different kinds or particle sizes on Bailey's website: silica sand or silica flint (200, 325, or 400 mesh). Since I use pre-mixed glazes, I've never ordered any of the ingredients.

 

I'm about to load another bisque batch. Guess I'll set it for slow! No platters, but one large utensil jar, which I'll prop on stilts.

Thanks!

ginny


In Topic: Large Platter Broke In Half In Bisque Firing. Anything To Do With It?

29 April 2016 - 08:48 PM

Attached File  IMG_6393.JPG   181.61KB   6 downloadsAttached File  IMG_6395.JPG   173.29KB   5 downloads

 

Chris...I guess I do not understand how to post a photo. Thought I followed the directions to attach files, but evidently I need to do something different!  Or, can you see them now?

ginny


In Topic: Greenware Lid Stuck

13 April 2016 - 07:16 PM

Next time try a torn strip of newspaper between the pot and lid as it dries...and as you are testing the fit. You can take the lid off by the paper without danger of pulling off the knob!