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High Bridge Pottery

Member Since 19 Feb 2013
Offline Last Active Today, 01:17 AM

#110294 Your Refractory Is Toast

Posted by High Bridge Pottery on 19 July 2016 - 07:47 AM

This video popped up in my subscription box and I thought it would be worth sharing on here. Haven't been able to find much about it's operating temperature or how long something like this would last but it sure is interesting making some refractory carbon out of bread. Seems like a bit of a strange one as in my head the carbon should burn away but maybe the reduction firing first changes something about the carbon.


Very crude ideas in the video but nothing like trying it out for yourself. 


Bread kilns here I come :D


#110259 Relay / Magnetic Contactor Question

Posted by High Bridge Pottery on 18 July 2016 - 01:13 PM

Pretty good company, had a few chats with their people. Sure they will get you sorted out.

#109670 Ceramics Basics - Help!

Posted by High Bridge Pottery on 01 July 2016 - 03:14 PM

This explains it pretty well, firing ceramics is about transferring heat into the pots so takes time. Take note of the heating rate oc/h last 100 of firing.



#109433 Stilt Mark Question

Posted by High Bridge Pottery on 26 June 2016 - 01:58 PM

I think you probably got the right answer. Not the right bit. Not something I have done though but I think you need to polish it.

#109274 Bubbles/craters All Over

Posted by High Bridge Pottery on 23 June 2016 - 02:41 PM

The glaze besides where it has cratered doesn't look bad. Makes me think it is the clay, not too complicated to try a different bisque firing or even rebisque your pots and glaze to see if that improves anything.

  • oly likes this

#109269 Crazing - Commercial Glaze

Posted by High Bridge Pottery on 23 June 2016 - 02:04 PM

Pottery is the art of putting a lot of time into failing.


You could add silica to try and lower the expansion of your glaze or some clay. 

#109198 Qotw: What Is Your Biggest Safety Fault?

Posted by High Bridge Pottery on 22 June 2016 - 01:08 PM

I am always a bit too lax with the electrical juice out the wall. Ran a 32amp kiln on 30amp breaker for 3 years although it was fired infrequently. Had relays get stuck on for 12 hours and wires melting during firings.


Took a knife to a wire still plugged in and turned on, learnt my lesson. 

#108601 Qotw: What Would Be The Title Of A Clay Book Of Yours?

Posted by High Bridge Pottery on 12 June 2016 - 03:17 PM

I would like a book, The complete encyclopedia of glaze tests.

#108414 Qotw: What Would Be The Title Of A Clay Book Of Yours?

Posted by High Bridge Pottery on 08 June 2016 - 02:14 PM

Journey from the centre of the earth.

A potter's tale.




Now if somebody could write it as I am terrible with words that would be grand.

#108350 In Search Of A Cone 6 Clear...long-Winded.

Posted by High Bridge Pottery on 07 June 2016 - 04:26 PM

I don't think you understand what is happening with the currie method. It gives you a whole range of silica and alumina values so some of them have to be within the limits. Except it would not work very well with this glaze at all given the recipe.


I still can't see anything outside the limits in the original glaze recipe just the alumina looking too high. Are you taking the lower limits as values you can use in a glaze or that you need to be somewhere in the middle/top to have a food safe glaze? What is so bad about the lower end of the limits?


If it's not within the limits that doesn't mean it unsafe. Only a clue that it might be. Same the other way, being in the limits is only a clue that it is food safe glaze or a durable glass.

#107923 Can I Use This ^10 Slip As A ^5 Slip?

Posted by High Bridge Pottery on 01 June 2016 - 03:30 PM

https://digitalfire....tion/index.html is my bible

#107914 Community Challenge #6

Posted by High Bridge Pottery on 01 June 2016 - 01:02 PM

Thank you for the kind words  :wub:  It is hard to think of challenges that everybody is going to enjoy, probably impossible so I hope my ideas are as good as they can be.


I very much like fluid marks and splodge in sculptures so that's probably a direction I am going in. Also thinking full length statue, could be interesting and not something I have tried before.

#107858 Community Challenge #6

Posted by High Bridge Pottery on 31 May 2016 - 02:02 PM



Welcome to the community challenge #6

This is a place where we can challenge ourselves alongside other community members to create ceramic works within the constraints set out in each challenge.
The Challenge
This challenge is the clay self-portrait.  
The Rules

  • Everybody can enter the challenge, all you need is a registered account on the forum.
  • Work in progress (WIP) images are encouraged. It can help to talk through your research and ideas but please don't spam the topic. Keep the updates informative and succinct.
  • One final entry per community member.
  • Attach images to your final entry post along with the text Final Entry - Forum Name
  • This will make sure you are not missed out of the results thread. Also make sure you post your final entry in this thread to be entered into the challenge.
  • The challenge will run quarterly and will be
    • 1st March to 29th May, 
    • 1st June to 30st August, 
    • 1st September to 30st November, 
    • 1st December to 30st February.
  • The results thread will be posted on the last day of the ending month. It will be a collection of all the entries into one post for condensed viewing and some post challenge discussion.

The Rest
Remember you are entering for your own enjoyment and there could be a risk that your work develops into something new and exciting.
Be considerate of others and don't post opinions without good reasons to back them up. We are all here to improve and progress with our ceramics.
Some dates may vary slightly as this is a community run project and it will depend on members having access to the forum.
Have any ideas for a challenge? Post them in the ideas thread http://community.cer...hallenge-ideas/

#107743 Longterm Glaze Issues | Sometimes Runny, Sometimes Breaks The Pots

Posted by High Bridge Pottery on 29 May 2016 - 03:55 PM

The crackle is caused by a mismatch between the clay and glaze as they expand and contract during heating and cooling (CoE). You have a size 6 pot in a size 5 glaze. You are actually looking for this difference in the glaze and clay whereas a lot of people try to solve this 'problem' Any clay with a much lower expansion than glaze will make the glaze crackle.



#107681 Longterm Glaze Issues | Sometimes Runny, Sometimes Breaks The Pots

Posted by High Bridge Pottery on 28 May 2016 - 03:54 AM

I am sure your supplier will have a potash feldspar or be easily able to find it. Will the 10% kaolin not be enough for application onto bisque?


I am missing a step in the jump from mixtures of molecules to elements and their ionisation energies. We are not working with K but K2O or K2O.Al2O3.... and so on. If I did melt and boil a feldspar is it giving me elemental gas or molecular gas, if that question makes sense. We seem to have mixtures that work together to find the lowest melting point and nowhere near the boiling point. I understand maybe a tiny fraction may get enough energy to break bonds with the mix but it seems strange that I could lose a lot. Isn't my alumina and silica holding onto everything. That is why potash melts at 700 but feldspar 1200.