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neilestrick

Member Since 04 Oct 2011
Offline Last Active Nov 26 2014 05:48 PM
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#70803 Clay Ph

Posted by neilestrick on 26 November 2014 - 05:32 PM

There was a ton of discussion about clay Ph sometime in the last year or so, as it pertains to plasticity, but there was a lot of info presented. Do a search and I'm sure you'll find it.




#69755 Dont Let This Happen To You!

Posted by neilestrick on 11 November 2014 - 10:31 PM

The kiln sitter is a mechanical device, and therefore has the possibility of not working. If any parts of the sitter stick, then it won't shut off. That's why they started putting backup timers on the sitters. Of course, if you set the timer too long then it doesn't do any good, and it's also possible for the timer to fail since it is a mechanical part as well. The only way to be 100% sure that a sitter kiln shuts of properly is to be there in person to check it. If you're not willing to do that then you have to accept that at some point your sitter will possibly fail and you will ruin some pots and/or the kiln itself.

 

The worst I have ever seen was a firing where a post or pot fell over onto the sitter tube and prevented the sensing rod from dropping and shutting off the kiln. It was an old sitter and didn't have a backup timer, so it kept on firing until the pots melted, then kept on firing some more until the shelves warped like potato chips and collapsed into a pile at the bottom of the kiln. The kiln was destroyed. The whole bottom half of the kiln was a melted mass of shelves and pots fused to the wall bricks. Luckily it was a really old kiln that needed to be replaced anyway.

 

For a digital kiln to over fire, a relay has to stick in the 'on' position, and the kiln has to be packed in such a way that enough heat is trapped in the section controlled by that relay that it can over fire. A section probably can't over fire in a cone 6 firing, but it is theoretically possible that in an earthenware firing a section of the kiln could over fire a little bit. In a two section (18" high) kiln where there are only two relays, one sticky relay can cause the entire kiln to over fire a little. I've seen that happen. I have never seen more than one relay stick 'on' at a time, however I have seen two relays fail 'off' at one time. Again, the only way to be sure is to be there to check that it has shut off.




#69549 V Gum Cer In Clay Body

Posted by neilestrick on 08 November 2014 - 09:43 AM

I think it's a fairly direct replacement, as I've always used 2% for both.

 

It seems like bentonite disperses better, but you have to dry mix it really well.




#69500 Lowfire Glaze Depression.

Posted by neilestrick on 07 November 2014 - 11:53 AM

I was thinking it should be possible to do cone 04 soda with the addition of other fluxes to the bomb, shouldn't it? I've seen mentions, but does anyone else have a line on a good resource? Could be really nice with the use of terra sig.

 

Low fire salt does not produce the glazed surface that it does at higher temperatures. It can give some great colors, though, similar to pit firing. Lots of reds and yellow and oranges. I used to do pit firings with wood shavings soaked in salt water (then dried), and got some fabulous results. 




#69489 Why A Knocking Noise

Posted by neilestrick on 07 November 2014 - 10:39 AM

Didn't I read somewhere here someone recommending using , rubber bands? or ???? around the pins if the bat holes are worn?  I have a  bat system, with a square for smaller inserts to go in and the holes on the base have worn.  so I'm interested in this.

 

I would just drill new holes.




#69082 Potter's Block.

Posted by neilestrick on 01 November 2014 - 08:53 AM

I go back to forms and techniques that I learned long ago in school, but have never really put into practice.




#68998 Overlapping Glaze Movement, Eek!

Posted by neilestrick on 31 October 2014 - 09:00 AM

When you run your test tiles, do a single dip on the whole tile, then a second dip on the top half. It's the best way to see how a glaze behaves.




#68973 Overlapping Glaze Movement, Eek!

Posted by neilestrick on 30 October 2014 - 09:02 PM

If you put the second dip on while the pot is still saturated from the first dip, it is likely to crawl. The first dip should not be totally dry, but dry enough that the pot can take in the water of the second dip without ruining the grip of the first dip on the clay.

 

That raspberry recipe likes to crawl. It needs to be on kinda thick to get good color, but that thickness tends to cause crawling with some glazes.




#68944 Your Favorite Clay To Throw

Posted by neilestrick on 30 October 2014 - 02:46 PM

Standard 365 porcelain & Standard 112 stoneware, because they both throw very well, with no warping issues. There are other great clay bodies out there, but I can buy these locally.




#68593 Exploding Pots During Glaze Firing

Posted by neilestrick on 25 October 2014 - 02:13 PM

That's cracking, not exploding in that photo. Exploding is hundreds of little pieces, shards in the element grooves, a total mess. It's really, really, really hard to blow up pots in an electric kiln that have already been bisque fired. They have to be fairly moist and fired really fast. The only time I have seen it happen is in raku firings where pieces weren't quite dry after glazing.

 

What's your firing schedule? I'm thinking that either the second firing is too fast either heating or cooling. Try slowing it down and see what happens.




#68570 Ceramic Cracking During And After Cool

Posted by neilestrick on 25 October 2014 - 09:23 AM

It is definitely possible for the glaze to crack the pot, especially if it was only glazed on one side (inside or outside), or if the glaze is very thick on one side (in or out) compared to the other. Differences in COE between the clay and glaze can also cause cracking.

 

Here's another recent thread that has had a lot of discussion on this subject:

http://community.cer...king-violently/

 

If the glaze is the only variable, then I would definitely start with that.




#68541 Small Jugs Pour Badly

Posted by neilestrick on 24 October 2014 - 05:22 PM

Make the spout wider and more pronounced, with more of a throat below the lip.

 

This one's from about 10 years ago:

 

Attached File  Pitcher-2.jpg   218.4KB   5 downloads

 

When I was trying to figure out pitcher spouts way back when, I threw 6 pitcher necks (about 4 inches tall) and pulled 4 spouts out of each one. By the time I got to 20 I had it figured out pretty well. Then I wedged all that up and threw some actual pitchers.




#68472 Newbie Help On Buying A Used Pottery Wheel

Posted by neilestrick on 23 October 2014 - 07:50 PM

Take classes. There are a million little things you'll do wrong that a teacher can correct while you're learning. You won't be able to do that yourself. By all means buy a wheel and practice at home, but the lessons are very important. There's a lot of crap in the internet that will only confuse and hinder you.




#68342 Adding Brushing Medium?

Posted by neilestrick on 21 October 2014 - 08:44 PM

I have not found bleach to be a good long term preservative. I think that if it was effective, we would see it used commercially since it is way cheaper and safer to store and use than the biocides that are used.




#68297 Kiln Questions

Posted by neilestrick on 21 October 2014 - 03:55 PM

If you have the pieces of bricks that have broken, just use some element pins to hold them in place. When it comes time to replace the elements, replace the entire brick at that point. Kiln cement will most likely not hold the pieces in place, and you'll probably get cement on the elements which is not a good thing. Also pin the elements where the broken grooves are to keep them from flopping out.

 

If the kiln is rated for 20 amps, it will need a 30 amp breaker. Your clothes dry may or may not work for that, and the plugs may not be the same. I would have an electrician check it al out before doing anything. Do not change out the plug on your kiln unless it's rated for the same amperage, and has the same number of prongs. Some of those older small kilns use a 4 prong plug. Either way, for 2 or 3 pole circuits you can only have one outlet on the circuit, so you'll have to unplug the dryer when using the kiln. If it does work out that you can use the dryer outlet, go ahead and fire it up. If it hits temp then it works.

 

As for the blank ring, if it's a sectional kiln that has an added blank ring, then the maximum temperature of the kiln will be much lower than without the blank ring. For instance, a cone 10, 7 cubic foot kiln like a Skutt 1027 with an added 4.5" blank ring drops to cone 1. Some kilns have a blank section built into them, in which case the temperature rating on the serial plate will still apply.

 

Make sure the kiln is 18" from anything combustible and 12" from anything not combustible.

 

You'll need shelves and posts. Get them locally if you can since they're expensive to ship.

 

Call Aim if you have specific questions about that kiln.