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yarddog

Member Since 24 Feb 2013
Offline Last Active Apr 16 2014 05:25 PM
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Posts I've Made

In Topic: Non-Plastic Clay

16 April 2014 - 01:44 PM

Is it generally accepted that if you buy a batch of unworkable clay, that is your responsibility to fix it? Or should you call the manufacturer to see if anyone else has had a problem with it, and to see if it can be replaced?


The Laguna distributor is a pretty good haul from here, and I may well return it on my next trip over. But that's a couple months from now...
Meantime, I should have been more specific. The clays are Laguna 60 and 90. I love the 90, and it throws like a dream, but folks seem to want to buy mostly the more dramatic 60, so I'd like to figure out a way to use it.
And no, it's not particularly wetter or drier.
Last, is it likely that pugging a bit of 90 into the 60, say half n half, would improve the 60 or spoil both?
Thanks.

In Topic: Glaze Too Thick...and Too Thin

07 April 2014 - 10:58 AM

Thanks for the caution about not scooping.
I do make a habit of mixing on the thick side, as advised.
However, my real question was why a thick glaze to which I then added just enough water to produce the desired consistency would go watery after sitting for a couple of days. These was no settling at all--I mixed it thoroughly with an immersion blender, then double checked with a bare hand.
It would make sense to me that a settled glaze would seem thin on top, but I don't quite get how a thoroughly mixed glaze would be fine one day, too thin the next.
Very little experience with flocculants or deflocculants. One or the other called for here?

In Topic: How Wet When Throwing?

21 February 2014 - 06:28 PM

Somewhere on YouTube, I came upon a British potter discussing the differences between American and British clays. His point, I think, was that British clays absorb much less water during throwing (particle shape/size/something?) than American clays, and are less quick to go soggy and weak.
Dunno if I'm remembering that right, or if it's true...but if so, I'd like to have some.

In Topic: Firing Schedule, Cone 6 Glazes

09 January 2014 - 08:39 AM

It seems that on some issues potters tend to be fairly certain of their positions, while rarely agreeing with one another...

My old Gare defaults to 400F/hr until it gets within a couple hundred degrees or so of the target temp, when it slows down and tiptoes to the end. So it appears that I am already firing toward the high end of the recommended rates.

Experimentation would be best, bu at 7-plus cubic feet, my kiln is by no means large but certainly big enough to preclude a lot of test firings at different rates.

thanks for all the input. I guess for now I'll stick with the current ramp, and continue to holler at my granddaughter to turn off her lights and close the damn refrigerator door.


In Topic: Glaze problem pinholes or blisters

07 January 2014 - 03:38 PM

I have been getting a bit of blistering, usually at the bottom of the kiln.
The thermocouple is brand new (~6 firings), and I have just replaced the elements.
Also, I re calibrated the controller.
Can't think what else to try.
Possibly related: it appears that my three center elements only begin to show a little color at around 1000 degrees. That is, the top and bottom elements get nice and red almost right away, but the center elements lag pretty far behind. According to a rep I spoke with at Evenheat, this is normal, but I don't remember it from previous kilns...
One last piece of data in case it helps: despite the new thermocouple and elements, the kiln is firing too hot, probably to 7 or a little higher.
Whew.
Why would I get blistering only in the bottom of the kiln? Suggestions?