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clay lover

Member Since 08 Apr 2010
Offline Last Active Yesterday, 10:13 PM
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Topics I've Started

Using Vent Caused Underfiring ?

09 May 2015 - 11:47 AM

I just unloaded the first firing using the Envirovent that I installed on my Skutt 1027.  The cones were much more even, slightly hotter at the TC, but much improved over the cones with out the vent.  Problem is, I used the cone fire mode for 04 slow fire, that is supposed to compensate for irregularities and the Skutt tec said it would be more dependable that the Ramp mode I had written for my firings.  Kiln ran 12.30 hrs, 4 hours less that the program I usually run, and went to 1945.with no hold.  My Ramp firings are to 1920 with an hour hld.  When I unloaded this AM, none of the 04 cones are bent at all, the 05 are only slightly bent. BUT the firing is more even with the vent. GRRRR. what went wrong? I can't call Skutt until noon my time Monday AM. hoped to be running a glaze fire on this work before then.

Can I refire the bisque without risking the work?  Do I need to refire it?  I'm used to 04 bisque work and this isn't even 06 from the looks of the 05 cones.


When Does The Most % Of Total Shrinkage Of Caly Happen?

06 May 2015 - 02:50 PM

I made a GREAT find this AM. a big plastic thing with exactly the size , angles and shape I have been wanting for slumping a basic form for what I want to make. BUT. it is 2" wider that my kiln. If my clay's total shrinkage is 12%, how much of that will be in the drying, how much in the bisque fire? I want this to end up just big enough to get in the kiln without touching any elements to bisque fire it. I know after the bisque it will be good to go for glaze firing . Can't wait to start on this!


DRAT, can someone correct the title?

Oxides Affecting Satin Finish?

04 May 2015 - 08:07 AM

I am working on finding a base glaze that has a satin finish that I can use different oxides with to get different glazes. Do some oxides flux a glaze more that others? All my attempts at blue are coming out shiny.
Does the iron in dark red and brown clays flux glazes that are used over them?

No Tare Beam ;-(

20 April 2015 - 11:46 AM

is there a way to add a tare beam to a triple beam balance without one?   Add implied this item had tare, but after purchase, it does not .  It has the knurled knob to balance out the empty scale, but no way to zero out any container used.  Any good home made ideas?  Thanks,  I should have shopped longer. 


Defloculate, Or Add Water?

17 April 2015 - 12:40 PM

I have a glaze that is too thick and adding water to it in the past made it thin in the final appearance, after firing, but still thick and gloppy, drippy, runs, when dipping.  I watched the you tube videos on the subject, and let it settle, dipped off some water, (clear), and tried adding sodium silicate. I  let it sit a couple of days , and then sieving it to 40 mesh.  There were small rubbery bits all through it, but they did sieve out.   It still is very thick in the bucket, finger marks stay on the surface.  When it sits a day or 2, there is just a bit of water on the top and under that is it homogenous, very fluffy, no thicker in the bottom I/3 of the bucket at all.

Do I add more sodium silicate, or now add some water?

 

F4 feldspar 38

Whiting       14

Zinc Oxide  12

Ball Clay       6

Silica           30

 

copper carb 2

Bentonite     1

 

Thanks for any advice, I have used this glaze for years and just now had this problem.