Chewie Posted January 25, 2007 Share Posted January 25, 2007 Anyone know how to calculate how much wax is needed for sphere mouldsI purchased a set from the US.... 3" - 4" - 5" Quote Link to comment Share on other sites More sharing options...
girlyracer Posted January 26, 2007 Share Posted January 26, 2007 Hi ChewieAfter consulting my daughter's school maths book, 'cos I forgot the formula for calculating volume, this is what I came up with.Using the formula 4/3 x Pi x R3 to calculate volume3" mould 14oz4" mould 33oz/2.06lb5" mould 65oz/4.06lbIt is only a rough guess. If anbody out there with better maths than me can confirm if that is correct. I haven't used maths like that since I left school a loooong time ago:)Ruby Quote Link to comment Share on other sites More sharing options...
cybersix Posted January 26, 2007 Share Posted January 26, 2007 I found this:5" spheres:http://www.spiritcrafts.net/5balcanmol.html4" sphereshttp://www.spiritcrafts.net/4balcanmol.html3" sphereshttp://www.spiritcrafts.net/3balcanmol.htmlHTH Quote Link to comment Share on other sites More sharing options...
Cetacea Posted January 26, 2007 Share Posted January 26, 2007 fill it with water and multiply by .8 Quote Link to comment Share on other sites More sharing options...
al58 Posted January 26, 2007 Share Posted January 26, 2007 (...)Using the formula 4/3 x Pi x R3 to calculate volume3" mould 14oz4" mould 33oz/2.06lb5" mould 65oz/4.06lbIt is only a rough guess. If anbody out there with better maths than me can confirm if that is correct. (...)Hi Ruby,Your formula is correct, but you must have made a mistake doing the calculation. Your figures are exactly 2x what they should be. Andre Quote Link to comment Share on other sites More sharing options...
al58 Posted January 26, 2007 Share Posted January 26, 2007 Your formula is correct, but you must have made a mistake doing the calculation. Your figures are exactly 2x what they should be. Hm, sorry, this correction is not clear, I should explain better. The numbers Ruby posted are properly computed, it's the units she got wrong: her values are in cubic inches, not ounces. It happens that the numbers in fluid ounces are approximately half those in cu.in.The right values are, roughly : 7-8 oz. for the 3"; 16-17 oz. for the 4", and 32-33 oz. for the 5".Cheers,Andre Quote Link to comment Share on other sites More sharing options...
girlyracer Posted January 27, 2007 Share Posted January 27, 2007 That's where I went wrong. I thought the amounts came up a bit on the high side. Thanks for putting me straight on that Andre.Ruby Quote Link to comment Share on other sites More sharing options...
Chewie Posted January 27, 2007 Author Share Posted January 27, 2007 The right values are, roughly : 7-8 oz. for the 3"; 16-17 oz. for the 4", and 32-33 oz. for the 5".Spot on, I have run one of each and the amount above is enough for the initial and 2nd pour, Thanks all... Quote Link to comment Share on other sites More sharing options...
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