Vince Pitelka on fri 9 may 03
Ivor wrote:
"Have you procured images of this phenomenon? If so, I, for one, would like
to see them
How are you able to distinguish between this phenomenon and the breakdown
between flock structures?
If you analyse the forces imposed in application of vertical pressure on the
inner base of the pot you may find that this is parallel to the crack
surface not normal to it. Pressure applied to the side will assist in
bringing the faces of the facture towards each other. Several people have
commented on their success applying a squeeze from the side."
Ivor -
Pressure from the side only helps when the foot is narrow. Grog or sand in
the claybody certainly helps limit the occurrence of S-cracks. But the best
technique to limit S-cracks is still compressing the bottom. Whether it
alligns the platelets or reduces the water layers or whatever the hell it
does, it works. I certainly don't need any more proof than that. I teach
the technique to my students, and it always helps them eliminate S-cracks.
Best wishes -
- Vince
Vince Pitelka
Appalachian Center for Craft
Tennessee Technological University
1560 Craft Center Drive, Smithville TN 37166
Home - vpitelka@dtccom.net
615/597-5376
Office - wpitelka@tntech.edu
615/597-6801 x111, FAX 615/597-6803
http://iweb.tntech.edu/wpitelka/
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