Jump to content


ayjay

Member Since 05 Nov 2011
Offline Last Active Today, 03:44 AM
-----

Posts I've Made

In Topic: Cone 6 Firing Schedule- Nerds

Yesterday, 03:44 AM

I've taken the liberty of Anglicising your firing schedule Nerd.

 

Use your current firing schedule up to 1120°C - no need to change any of that.

 

50°C an hour from 1120°C to 1200°C with long peak hold: or,

 

50°C an hour from 1120°C to 1220°C with very short hold.

 

Natural cool. -- unless colour development is desired.


In Topic: Drying Cabinet Idea

12 January 2017 - 05:56 PM

Sometimes i think it would be really neat to have things dry more quickly, but I reckon on the whole I'm happy with my slow drying garagio, no heat and no draughts.

 

I can throw pots and leave them uncovered for 10 days or more before they're dry enough to trim. It gives me the best chance to catch them at the right time for trimming/attaching handles etc.

 

I've not tried, but I reckon sometimes I could put them back on the wheel after a week and pull another lift.

 

If I need to speed them up they go outside if it's breezy and in the airing cupboard if it's not.


In Topic: Quickie Question – What Weight Of Clay To Make A Large Bread Crock?

12 January 2017 - 05:47 PM

A guy where I learnt to throw quite often used to make large stuff like bread crocks and hand washing bowls - he was a very experienced thrower and to me at the time, the amount of clay he was throwing looked almost monumental.

 

..........BUT, he had a lot of problems with S cracks in his bottoms, so make sure you compress your bottom well and maybe also take the precaution of firing it on something that will allow some movement.


In Topic: Is Cone 6 Practical For Domestic Ware In The Uk?

10 January 2017 - 11:31 AM

 

Oly - if you give Valentines a ring they're always very happy to advise. Similarly Potclays and Potterycrafts. I'm just firing some stoneware B17C to 1200oC with a 30 minute soak. I don't usually use stoneware, this was from a throwing weekend I attended a few months back. Hopefully they'll survive AND be leakproof as there are some mugs and a vase in there. Having read your post I'll definitely do a leak test before using any of them!

 

 

 

Having had some problems with vessels leaking due to clay not being fully matured at cone 6 (and glazes crazing), I'm beginning to wonder if this cone 6 thing, which I thought was such good idea when I first got my kiln and wanted to save energy, well, maybe it just isn't really that practical in the UK, where I believe the tradition has been of high-fired stoneware cone 10+.

 

It seems in the USA there may be a better selection of clay bodies developed for lower temperatures and hence cone 6 in electric kilns is the way it's done.

 

Be very interested to hear views on this from both UK and USA potters.

 

If you're talking about the ES5 clay (as in another topic recently) I don't understand why you're having trouble with it, I use it regularly, and I discovered recently that a couple of my friends are using it at a class they take, the class is run by Colin Jones who was head of ceramics at Brockenhurst college, he supplies and fires their pots, none of us have any problems with ES5 not being watertight @ ^6.

 

Another topic I dug out appears to bear this out:- http://community.cer...nt-water/page-2

 

I'd be quite happy to write out my firing schedule for both bisque and glaze if you're interested, and I can give you a clear glaze recipe which works fine for me on ES5.  I think it would be better than Michael Bailey's T14, which on checking his book seems to be more suited to using with oxides which provide some fluxing to the glaze  (read p32 ) rather than as a clear liner glaze.

 

 

 

Celia did you have any luck with testing the B17C?

 

Ayjay have you done any formal tests for absorption and leakage on the ES5 you mentioned?

 

Joe

 

 

 

Nothing formal Joe: I tested some a couple of years ago following a procedure that I found on this forum somewhere and the results were well within the range I was hoping for.

 

It was either 1.2 or 1.6, I can't remember which, (I should probably make another test)

 

From what I make and use at home, viz. a variety of ever changing mugs (my wife is an expert at breaking things) are the most likely to cause a noticeable problem: they don't.


In Topic: How many hours does an ^06 slow bisque and an ^6 slow glaze take on an electr...

10 January 2017 - 02:54 AM

all of you are talking about the time when you turn off the kiln right like Mark C pointed out?

 

actually cooling enough to take the pots out might take another few hours depending on kiln and other factors right? 

 

Yes: I just allow 24 hours from start to showtime for both bisque and glaze,   It's the K.I.S.S. principle at work.