Pancho07 Posted June 19, 2018 Share Posted June 19, 2018 Ive been asked to make some beads for a semi local artist and was wondering if anybody had a formula to figure out the starting size of a disc for various sized beads, ie diameter of a disc to make a 1/2 inch diameter bead out of 22, 20 , or 18 ga sheet, we haven’t decided on a thunk was yet. I know that with alittle time I could figure it out the long way but I don’t want to waste the materials and I’m not great with math. I can follow a formula but coming up with one is out of my league, thanks in advance Quote Link to comment Share on other sites More sharing options...
Steve Sells Posted June 19, 2018 Share Posted June 19, 2018 take a 1 inch disk. make the bead, measure it and there is your formula, if its a 1/2 inch bead you know its a 2 to 1 ratio Quote Link to comment Share on other sites More sharing options...
Pancho07 Posted June 19, 2018 Author Share Posted June 19, 2018 Thanks Steve Quote Link to comment Share on other sites More sharing options...
ThomasPowers Posted June 20, 2018 Share Posted June 20, 2018 Surface area---half of a sphere would get you close; then it depends on how much thinning you do working it to shape. Quote Link to comment Share on other sites More sharing options...
4elements Posted June 20, 2018 Share Posted June 20, 2018 Surface area of 1/2 sphere; A=4pi(r sq.)/2. Sorry I don't have symbols Alternatively; A=C×r, C is circumference and r is radius of the sphere. The area of a sphere is equal to the lateral area of a cylinder circumscribed around it. So A=C×D Quote Link to comment Share on other sites More sharing options...
4elements Posted June 20, 2018 Share Posted June 20, 2018 Theoretically a disc with the same area as the intended 1/2 sphere would work, but that doesn't take into account stretching and forming Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.