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High Bridge Pottery

Member Since 19 Feb 2013
Offline Last Active Yesterday, 06:17 PM

#125505 Can't Throw, Can Extrude

Posted by High Bridge Pottery on 18 April 2017 - 04:07 PM

I am jealous  :lol: They look great

#125338 Pottery Knowledge Quiz Of The Week(Pkqw): Week 2

Posted by High Bridge Pottery on 13 April 2017 - 01:09 PM

Pres what was the problem with getting an image in the post?




#125335 New Kiln Burners

Posted by High Bridge Pottery on 13 April 2017 - 12:25 PM

General guess is 10,000btu/cf so 200,000 seems good.


Chimney sounds a good size too. That's worked out as 3x downward pull + 1/3 horizontal pull.


You can make a good quality forced air burner for half the price of a 'new' venturi burner

#125332 Iron In Glaze? Absolute Beginner's Questions

Posted by High Bridge Pottery on 13 April 2017 - 12:04 PM

Not sure if your kiln has a programmer but this talks about firing kilns


and what happens during the firing


a list of major oxides used in glaze


some more about oxides



It will take you twice as long as half the length it takes you  :ph34r:

#125178 Us To Uk Frit Substitution Chart?

Posted by High Bridge Pottery on 10 April 2017 - 09:13 AM

This is the best I can do to match chemistry, doesn't mean they will melt exactly the same as the right frit but could be a start. Hard to get enough sodium in and always too much alumina or calcium. They use a lot of soda ash while making frits I think. Don't know how usable it is for a glaze material as it's soluble. 3110 was pretty much impossible to replicate.



#124953 Making Glazes

Posted by High Bridge Pottery on 06 April 2017 - 04:06 PM

There really should be a difference in weight. I don't think clay should weigh anything like silica or frits by volume.


The problem with scoops is they are inaccurate, If the weights were right and you retotaled the oz values into 100 then you could probably in theory work out what you need to add. That guessed recipe might not even match to what you actually scooped in. 


I worked out from your weights you have double the rutiile in the recipe or 195%

#124743 Fast Motion Booth Setup

Posted by High Bridge Pottery on 03 April 2017 - 02:40 PM

You don't need to do anything more than past the vimeo link into your post. Forum seems to do the rest. If that doesn't take you can use the media tags, or video tags.


Does the same thing.

I tried to add a size for the video so [media=1260,720]URL[/media] but that wouldn't work.

  • GEP likes this

#124675 Looking To Start Mixing My Own Glazes

Posted by High Bridge Pottery on 02 April 2017 - 08:21 AM

I generally start with 2/3 the weight of water. So if I am making a 5kg batch of glaze I will chuck 3-3.5 jugs (1000ml) of water in the bucket first, add dry and mix up then measure SG the next day and add water as needed.


I find 2/3 weight will get you to about a custard consistency 

#124627 Sio-2 Clay - Porcelain(Black) - Black Ice

Posted by High Bridge Pottery on 31 March 2017 - 08:57 PM

Now I can see why you are happy, it looks awesome  :D

#124625 Sio-2 Clay - Porcelain(Black) - Black Ice

Posted by High Bridge Pottery on 31 March 2017 - 08:38 PM

What is this? Pixel rations!?? I can hardly see them at 255x300 pixels. Always wanted to try single firing but thought the pots will fall apart.


It's also 02:40  :blink:

#124532 Looking To Start Mixing My Own Glazes

Posted by High Bridge Pottery on 30 March 2017 - 11:51 AM

Pretty much every glaze recipe you find will have a feldspar in, so what is the difference? In my opinion not too much but they all bring different things to the table.


Here is a pic from digital fire melting feldspars, you can see there are differences in the way they behave. 



Now which one should you choose? Probably worth getting a high potassium feldspar and high sodium feldspar and seeing which one works best for you.


Kaolins and ball clays will be relatively similar (like feldspars) to each other but all bring slightly different things to the table. Again it will be maybe trying a few out and seeing what works best. EPK seems the go to.


Silica, that will be there too. Mesh size, as fine as you can but 300 is good.


Frits, I don't have that much choice over the pond but 3134 and 3124 are common in john brits cone6 book.

For a calcium source I like whiting but a lot of people use wollastonite.

So for a basic clear you need a feldspar, silica, clay, frit and calcium source.

A source of magnesium oxide is nice too, talc or dolomite.

#124508 Submit Your Community Challenge Ideas

Posted by High Bridge Pottery on 30 March 2017 - 06:45 AM

I really enjoyed doing the challenges but I have stopped running any. I felt they had run their course as participation was dwindling and my ideas were not bringing people in. I had fun trying it out and thank you to everybody who joined in but don't feel bad if you didn't. 


Anybody is more than welcome to take up the community challenge torch and continue.

#124446 I'm Trying To Figure Out How To Make A Pipe?

Posted by High Bridge Pottery on 29 March 2017 - 08:52 AM

As Polydeuces says they are mostly made hollow and one hole at the bottom of the bowl. This was the best picture I could find, there's no reason it can't be solid and you have to match the holes but I guess making it hollow is easy with glass. Some seem to have this hole on the side too.



#124438 Plastic Bat Issue

Posted by High Bridge Pottery on 29 March 2017 - 06:05 AM

Is the batt just off centre or is it actually wobbling around the pins? An off centre batt isn't a problem, if a little confusing to start with but wobbling will not help.

#124245 What Might This Be?

Posted by High Bridge Pottery on 24 March 2017 - 08:49 AM

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