Calculating amount of glass for a casting by weight of clay? - WarmGlass.com

Calculating amount of glass for a casting by weight of clay?

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Geo
Posts: 48
Joined: Mon Jul 07, 2003 8:54 am

Calculating amount of glass for a casting by weight of clay?

Postby Geo » Mon Apr 21, 2014 4:51 pm

Hello,

Can someone please remind me how to calculate the amount of glass I will need for a casting, based on the weight of a clay model?

Thank you!

Yardic Glassworks
Posts: 80
Joined: Sat Mar 06, 2010 9:29 am

Re: Calculating amount of glass for a casting by weight of c

Postby Yardic Glassworks » Mon Apr 21, 2014 5:07 pm

Clays can vary a bit, but when using the low fire clay that I use, it is weight of clay X 1.40 equals glass weight. There are others here who use clay much more than I do, so they may have some additional calculations that they use. Tim
Tim Yardic
Yardic Glassworks

nbobb
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Location: California
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Re: Calculating amount of glass for a casting by weight of c

Postby nbobb » Thu Apr 24, 2014 5:46 pm

Or, you can form the clay into a shape, like say a cube, calculate its volume in cubic centimeters, than take that volume times 2.5 to get the grams of glass that you will need. (2.5 grams/cubic centimeters being the density/specific gravity of Bullseye glass).
Nancy Bobb
Firewalker Studio
http://www.firewalkerstudio.com

Stephen Richard
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Location: Glasgow, Scotland
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Re: Calculating amount of glass for a casting by weight of c

Postby Stephen Richard » Sat Apr 26, 2014 3:58 am

2.5 is the approximate specific graivity of all soda glass. Lead glass and others are different.
Steve Richard
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Soozin
Posts: 11
Joined: Mon Sep 26, 2005 10:40 pm
Location: NEW ZEALAND

Re: Calculating amount of glass for a casting by weight of c

Postby Soozin » Sun May 04, 2014 3:48 am

or use the water displacement method.. Once you take the clay out of the mould, pour water in... and then use the displacement method...

Geo
Posts: 48
Joined: Mon Jul 07, 2003 8:54 am

Re: Calculating amount of glass for a casting by weight of c

Postby Geo » Sun May 04, 2014 4:22 pm

Found my notes from an old project. A pretty soft and moist clay. Weight of clay x 1.3 worked perfectly. Thanks everyone.


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