How to calculate thickness of glass needed for a ring drop

[texasbridge]

I need some help on calculating how thick my glass needs to be for various depths when creating drop out molds.  I know that the further my drop goes, the thicker my glass slab needs to be for the stretch.  Does anyone have a method to calculate this?  .

I just finished this drop out vessel where I cut off the brim (thanks for posting the picture for this!) and my glass was 9mm thick.  The resulting vessel had a 4 inch drop and the walls were 4mm thick.  It took one hour at 1240F to achieve that drop.  You can see the drop (clear with read multi colors) on my blog.

Bridget

[Stephen Richard]

http://glasstips.blogspot.co.uk/2011/07/aperture-drops-length-of-drop.html

Stephen Richard

blogs at: http://www.verrier-glass.blogspot.com/ and  http://www.glasstips.blogspot.com/

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