Michael Wendt on mon 28 jun 04
Earl posed the question how to glaze with small amounts of glaze.
I often encounter the same problem, even though I mix huge batches of glaze
(sometimes 60 gallons at a time).
The solution I found is to keep your eyes open for a variety of containers.
I have many different barrels, tubs, buckets, pans and even bowls.They take
up very little room because they nest.
I try to find shapes that give me about an inch of clearance all the way
around a large piece with enough room above the lip to make the glaze volume
in the tub less likely to overflow.
Do a rough estimate of the volume of the pot in cubic inches ( pi* radius^2*
ht), and do the same for the glaze container chosen.
Use the difference in volumes plus enough to give an extra inch of depth as
the quantity of glaze needed to dip.
Example: A crock 6" in diameter x 8" tall has a volume of 3.14 x 3 x 3 x 8 =
226 cubic inches. A bucket 10" in diameter x 12" tall has a volume of 3.14 x
5 x 5 x 12 = 932 cubic inches. If I subtract the volume of the pot from the
volume of the bucket, I can see the most glaze I can have in the bucket and
not have it overflow is 706 cubic inches (932-226=706). Since it would be
good to be sure that I have enough glaze to cover the entire pot, the glaze
volume needed to do that must be at least 8" with the pot submerged to the
rim in the glaze. That amount is 3.14 x 5 x 5 x 8 = 628 cubic inches (less
the volume of the pot -226) or 420 cubic inches.
For safety, I allow an extra inch ( 3.14 x 5 x 5 x 1 = 78.5 cubic inches.
Now the part to memorize:
A gallon of glaze is 231 cubic inches so we need at least 420 + 78.5 = 498.5
cubic inches of glaze. 498.5/231= 2.16 gallons.
As you can see, having a container closer to the size of the item would
allow you to dip single pots with very little glaze needed.
Regards,
Michael Wendt
Wendt Pottery
2729 Clearwater Ave
Lewiston, Idaho 83501
USA
wendtpot@lewiston.com
www.wendtpottery.com
Lee Love on tue 29 jun 04
It was mentioned that handles pose a problem when
spraying. Can you dip the handle, resist it and then spray?
--
Lee in Mashiko, Japan http://mashiko.org
http://journals.fotki.com/togeika/Mashiko/ Commentary On Pottery
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