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High Bridge Pottery

Member Since 19 Feb 2013
Offline Last Active Today, 02:33 PM

Posts I've Made

In Topic: Stoneware Clay Properties

20 February 2017 - 06:25 PM


Porcelain:  50% kaolin, 25% silica, 25% feldpsar, 2% V-Gum T --plastic, easy to move around


Wait, I have never found this with porcelain. Whenever I try and throw it it doesn't want to move.

In Topic: Adding A Touch Of Gerstley Borate?

17 February 2017 - 04:37 PM

Adding 10% GB may just make your glazes glossier and a bit more fluid. Here is a test tile I did using only GB as the flux. Going up increases in Kaolin and to the right increases in Silica. There's a certain point that you get some depth with 'boron clouding'. I remember it being related to how much silica is in the recipe too. Cone10.


Do you have any rutile/titanium/tin? Have you tried layering glazes?



In Topic: J.w. Ratcliffe & Sons Potters Wheel

17 February 2017 - 10:09 AM

They are pretty heavy. Two people can quite easily move.

In Topic: Home Made Kiln Controller

14 February 2017 - 05:02 PM

It has been a while since I got to dabble with electronics. Looking into automating a gas kiln. Found a ball valve + actuator that needs 0-10v signal sent for how open it is. After some googling I found this op-amp circuit for doing that exact job so set about making it.




Took me a few failed attemps (wired the 24v positive up from actuator up to my raspberry pi and killed it, same with chip) but once I made sure it was the right circuit it all works perfectly.

Realised I never posted the MAX31855 circuit so here is that one too.




Tested it out on the kiln today and it works a treat. Still lots more work for actually programming the thing to do sensible things.





In Topic: Clay In Glazes.

14 February 2017 - 04:24 PM

I haven't really encountered any bacteria growth in the glaze/bucket or a noticeable loss of it's effect but I can use a bucket of glaze a month.