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JBaymore

Member Since 06 Apr 2010
Offline Last Active Today, 04:36 PM
*****

Posts I've Made

In Topic: How Forgiving Is Placement Of Posts Under Shelves?

Today, 04:33 PM

When the posts line up over each other, a given shelf is only "carrying" the weight of the ware ON that shelf. If a post from shelves above is placed on a shelf and not aligned over the lower post, then that shelf is beating a portion of the weight of everything above it. Worse, all of that weight is concentrated on a surface area that is the square area of the post itself where it contacts the shelf it is on.

Easy to get a failure of a shelf in a large gas, wood or electric kiln (BIG one)if you do this.

No magic to 1" or 1/2" or 3" in from the sides of the shelves as far as support goes. For small electric kilns...... this practice tends to get the posts a bit away from the elements...... which transfer heat energy mainly by radiant means. This improves the radiant heat transfer a small bit.

best,

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

In Topic: Small Stuff Sells-This One Sweet Dish Is From Oldlady

Yesterday, 09:36 PM

i died on an operating table in 1974 but i am still here.  i celebrate the name.

 

And may you celebrate it for a long time to come!

 

best,

 

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


In Topic: White Crystals On Fired Vase

Yesterday, 09:27 PM

marshadhor,

 

Do you have a water softener in your home?

 

best,

 

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


In Topic: White Crystals On Fired Vase

Yesterday, 09:25 PM

Basically....... there is no such thing as a cone 6 to 10 "vitrified" clay body.  From ANY manufacturer.  It is either mature at 6 and overfired at 10.......... underfired at 6 and mature at 10 ..... or slightly underfired at 6, mature at about 8, and slightly overfired at 10.

 

The suppliers sell these 6 to10 thingies this way to keep from having to stock SO many clay bodies for all the various firing temperatures.

 

BTW...... good knowledgable earthenware potters use non-vittrified clay bodies with glazes that fit and get work that is serviceable for food use and vases and such.  So you do not HAVE to have a fully vitrified body.  But getting that to work is a tough technical road to follow.

 

best,

 

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


In Topic: Are We Being Hacked Again?

18 October 2014 - 05:55 PM

FYI.... my guess is that most of the SPAM that happens here the average forum member is not even seeing....... the Mod team is getting them before too many folks see the garbage they post. There are a few forum members that are "eagle eyes" in spotting these posts (thanks!) and are hitting the "report" button at the bottom of the offending posting... and then the Mods go and kill the little suckers accounts ;) .

 

A LOT of this junk happens in the wee hours of the night. I got a lot of them before anyone reported then when I was in China.... 12 hours "off" Eastern US time.

 

best ,

 

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