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High Bridge Pottery

Member Since 19 Feb 2013
Offline Last Active Today, 02:02 PM
*****

Posts I've Made

In Topic: Calcite

25 March 2017 - 06:47 AM

My guess is they are exactly the same or maybe whiting contains some different crystals of CaCO3. Like Quartz and Flint, it's still Silica.


In Topic: Kiln Not Firing To Temperature?

24 March 2017 - 08:27 PM

Are you able to share your software? I have also done something similar, just with type R thermocouples.

 

My small test fire 120V Cress BT911T kiln is not firing to temperature. I have always noticed it fired slowly, but firing to cone 06 it got there eventually.

 

I recently tried firing to cone 5 and I could not get above 1960 degrees fahrenheit, and going from 1900 to 1960 took 5 hours. I'm controlling the kiln using an SSR, reading temperature with a K-type thermocouple through a MAX31855  with a PID controller running on an Rpi with a webserver hosted.

 

My kiln elements are measuring at 8.8 ohms, rather than 8 ohms nominal. I am getting 90% of full power.

 

Would this be enough to prevent a full firing? This seems strange to me.

 

I am considering replacing my elements, seeing if that fixes my issues, I am not sure though. 

 

Does anyone have experience with these 120V kilns?


In Topic: What Might This Be?

24 March 2017 - 08:49 AM

I would make a guess at some sort of englobe (slip) too. Doesn't look like a glaze

In Topic: Help Needing Matte Black Finish Recipe!

22 March 2017 - 09:57 AM

:D Nice to meet a fellow northerner.

 

Looking at the pictures it will be better to use a black glaze than colour the clay. You have a couple of options, potclays or ctm ceramics probably sell an earthernware glaze that you could use that is the right temperature or you could find a satin transparent glaze recipe for the temperature you need and add colouring oxides (iron, manganese and cobalt) to make black.

 

If you don't need much glaze you are probably better off going commercially made.


In Topic: High Fire Pink Glaze Recipe

22 March 2017 - 09:52 AM

Somewhere to start.

 

https://glazy.org/recipes/8419