[Clayart] old cones

ronroy at ca.inter.net ronroy at ca.inter.net
Fri Sep 24 20:30:18 UTC 2021

I would not recommend kiln sitters - to many problems.

Best to be there when the kiln is supposed to turn off.

We had a problem because some ware blew up. A piece of clay got in  
below the rod so the held the rod up.

If you don't have a way of knowing that your kiln has shut down at the  
right time the chances are you will eventually pay the price.


Quoting John Post <johnpost89a at gmail.com>:

> Hey Mel,
> In my past life as an elementary art teacher I replaced many kiln sitter
> sensing rod mechanisms.
> I don't like that little silver colored calibration disc they give you with
> sitter.
> I used to calibrate the dropping mechanism with a perfectly fired cone from
> a previous firing. That way I would be setting the lever up to drop when it
> had a cone fired the way I wanted it to fire in the sitter.
> When I first started teaching, I would attempt to repair the existing kiln
> sitter mechanism by figuring out what was causing it to malfunction.
> After having repeat issues with some kiln sitters I decided they were
> cursed and it was more prudent and gave me more peace of mind to just
> replace the entire sensing rod mechanism from the get go.
> Since the goal here is to stop having misfiring I would buy a new box of
> cones because they so inexpensive - not because I think they are the
> problem.
> Another random thought I have about those sensing rods is that they take an
> awful lot of abuse from corrosive fumes.
> Sometimes a bent or sticking sensing rod is the problem and not the little
> prong set up that holds the cone.
> On Fri, Sep 24, 2021, 11:36 AM mel jacobson <melpots at mail.com> wrote:
>> We have been experiencing some sticky cones and some
>> over fires on one electric kiln.  I will probably
>> exchange the entire norton kiln sitter...I have all
>> new parts...But, one of our vendors asked colleen.."are your
>> cones really old?"  yes, like 25 year old boxes.
>> Arnold and I have no reason to believe cones can get old.
>> It seems to be getting crazy.  Arnold likes to advise folks
>> to keep a small bottle with thick kiln wash to dab on the
>> cone holders.  I have used itc in the past. but, not on this
>> kiln.
>> I know, I know...what is the recipe for kiln wash for
>> this sort of application.  ?
>> what have veteran potters experienced with this issue.?
>> (colleen is now using a new box of cone 08 bars, and she
>> is experiencing kiln firing fear.)
>> We had the cone packs blow up in the baby stoneware and
>> i fired it with two pyrometers and color.  hit cone 11 perfect.
>> Had one pyrometer stick at 1900...threw that one out...hit it with
>> a brick.
>> I am sick of this issue.
>> Mel
>> website: www.melpots.com
>> www.melpots.com/CLAYART.HTML
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Ron Roy
ronroy at ca.inter.net
Web page ronroy.net

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