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Calculating shrinkage
Is there a fairly simple, but most importantly, very accurate way to figure
shrinkage? I would love to know how to be sure the finished piece would fit, say a ring for large water urns, spigots, lamp kits, etc. Thanks for putting up with all my newbie questions. |
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#2
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Thanks Fiona.
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#3
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There are at least two ways to calculate shrinkage. The first is to buy a
shrink ruler, which has four different shrinkage factors already printed on the ruler. Ask your supplier what the shrinkage factor is for your clay and then use that number (i.e. 12%) on the shrink ruler. The other way is to cut a ruler size slab from the clay body you use. Using a ruler, make your marks on the piece of claythat correspond to the markings on your ruler or tape measure. Then you go through the normal firing procedures that you normally use. The clay will have shrunk but all of your markings are proportional. Take your original ruler you used as a guide. Lets say you now want an 8" bowl. Take your tape measure and see where 8" falls on your clay ruler. Let's say it falls at 9 3/4" on your clay ruler. You now know that to get an 8" bowl you must throw something approximately 9 3/4" to end up with 8". Have I confused you enough? Steve in Tampa, FL, USA "GaSeku" wrote in message ... Is there a fairly simple, but most importantly, very accurate way to figure shrinkage? I would love to know how to be sure the finished piece would fit, say a ring for large water urns, spigots, lamp kits, etc. Thanks for putting up with all my newbie questions. |
#5
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make a shrink ruler.
1. use a plain old wooden ruler. 2. cut a slab of clay to the size of the ruler. 3. mark off increments as detailed as you like. 4. fire the clay "ruler". and glue it to the back of the "real" ruler. on one side you'll see the starting size, on the other you'll see the finished size. you can make judgements from there based on what you want to make. . i have several rulers in my workshop for different clays. see ya steve Subject: Calculating shrinkage From: (GaSeku) Date: 7/4/2003 9:47 AM Pacific Daylight Time Message-id: Is there a fairly simple, but most importantly, very accurate way to figure shrinkage? I would love to know how to be sure the finished piece would fit, say a ring for large water urns, spigots, lamp kits, etc. Thanks for putting up with all my newbie questions. steve graber |
#6
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This is great info. Thanks so much! I am so grateful to all who have answered
my question. You are great people! |
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Steve,
How clever! Thanks for the great tip! Gaye |
#8
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I love it when people make things nice and simple and also solve the
question at hand.......very good....from Jim in Jersey psci_kw wrote: "Mud Dawg" wrote in message om... There are at least two ways to calculate shrinkage. The first is to buy a shrink ruler, which has four different shrinkage factors already printed on the ruler. Ask your supplier what the shrinkage factor is for your clay and then use that number (i.e. 12%) on the shrink ruler. The other way is to cut a ruler size slab from the clay body you use. Using a ruler, make your marks on the piece of claythat correspond to the markings on your ruler or tape measure. Then you go through the normal firing procedures that you normally use. The clay will have shrunk but all of your markings are proportional. Take your original ruler you used as a guide. Lets say you now want an 8" bowl. Take your tape measure and see where 8" falls on your clay ruler. Let's say it falls at 9 3/4" on your clay ruler. You now know that to get an 8" bowl you must throw something approximately 9 3/4" to end up with 8". Have I confused you enough? Steve in Tampa, FL, USA "GaSeku" wrote in message ... Is there a fairly simple, but most importantly, very accurate way to figure shrinkage? I would love to know how to be sure the finished piece would fit, say a ring for large water urns, spigots, lamp kits, etc. Thanks for putting up with all my newbie questions. Steve, the idea of making a ruler out of the same clay is pure genius! Can I throw my calculator away now ? g Now all I have to do is figure out how to make it flexible :) Wayne Key West |
#9
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