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JBaymore

Member Since 06 Apr 2010
Offline Last Active Today, 09:19 AM
*****

Posts I've Made

In Topic: Granite For Wedging Tabletop/element Wire For Fixed Cut Wire ?

Yesterday, 11:06 PM

Guitar strings make great cutoff wires. Put a stiff spring on one end. I've got one that's going on 13 years.

 

Fender Super Slinky E.

 

best,

 

..........................john


In Topic: What Exactly Do I Have Tested For Leaching On My Food Ware?

Yesterday, 08:43 PM

At the minimum get the MSDS for the particular glaze.  From that you MIGHT be able to tell what is in it... if not the amounts.

 

Only test for things that can be toxic and that are (or might be) there.  No need to test for stuff like SiO2, Al2O3, etc.

 

best,

 

.......................john

 

See the FAQ at the top of the Technical For um section if you haven't already.


In Topic: Making Glazes...all At 2000 Gm Dry Ingredients But Not At All The Same In Vol...

Yesterday, 01:59 PM

When you understand the differences in the molecular weights of the various chemicals.... you understand why that happens. (Order a 50 pound bag of magnesium carb sometime ;) .)

 

best,

 

...................john


In Topic: Do You Teach To Throw Off The Hump?

Yesterday, 10:01 AM

Can someone explain how one can compress the bottom od what seems to be a bottomless piece of clay? When I try, the pot just gets deeper in the hump. I don't get it. I keep moving the cut off line lower.

You can't......... one of the ceramic myths. And we can never really "compress" anything.... what we are doing is aligning the clay particles so that the flat surfaces are parallel to each other. Another ceramic myth.

 

However there are techniques that can minimize the S cracking... that are used in throwing off the hump from Japan. I can't verbally describe them well... and at the moment I have no time to write a complex thing. Maybe more later. (Not much more her for a week now....busy).

 

best,

 

........................john


In Topic: Shelf Grinding

Yesterday, 09:55 AM

 

I use diamond on an angle grinder on silicon carbide and Advancers.

When they need a big going over.... take them to the sandblaster and say "me em' black again. Simple. No hazard.

best,

..................john


Waaaait a minute. I thought advancer and silica carbide didn't gunk up with glaze. Are you grinding from ash firing?

 

Yes....... I fire a noborigama. Regular silicon carbide does "gunk up".

 

And for the Advancers....... most of the time I just use a putty knife to flick off stuff.....not much stuicks (but for about $250 a shelf... they should even stack themselves). My point was that I am not using diamond on clay ar alumina shelves.... hard to not eat a hole in thiose instantly. But sometimes the kiln wash builds up and gets uneven more than I like. And I DON'T like getting exposed to repeatedly fired stuff that contains microcrystalline silica in the cristobalite form (fired kiln wash)... hence the sandblaster comment.

 

repeatedly fired kiln was dust.... BAD stuff.

 

best,

 

.......................john