[Clayart] making a flat pattern for a concave surface
p.hamer at btinternet.com
Sun Mar 23 18:33:18 EDT 2014
Sorry, there is no mathematical fix. You are dealing with surfaces which have compound curvature everywhere,on the other
hand things like bent stencils cannot have compound curves anywhere. In the lingo, your decorations are not "developable
surfaces". [A topic of some interest to people bending sheet metal, or trying to make nicely shaped boats out of flat sheets
of metal or ply.]
Maybe you can shift from trying to apply stencils to using printing pads. If you make these out of sponge, you would only have
to cut them so they approximately fit and rely on their flexibility for the rest.
Depending on the shapes you want, you might also try applying the image to a flat sheet, and then curving it in a "drop mould".
Should work (with some distortion) on a convex surface; not too sure about concave ones.
From: Marci <marci at ppio.com>
To: clayart at lists.clayartworld.com
Sent: Sunday, 23 March 2014, 16:52
Subject: [Clayart] making a flat pattern for a concave surface
Calling all you math guys .....
I want to be able to make flat patterns for concave surfaces . ( specifically Christmas ornaments ) .
I d like to be able to make flat templates of designs that can be transferred to the top and bottom of the balls ( for example , 5, 6 and/or 8 point " flower" shapes ) and while I can eyeball the design directly onto the piece and can play with cutting some paper trial and error , Im wondering if there is some sort of mathematical way to do this . ( specifically , where to add gores so that the pattern can lay flat to design the elements of it .. but then fit the curvature when taped to the round piece ) ... and then possibly even made into waterslide decals ...
Ive searched the net but havent been able to find the information I need but Im not sure Im using the right search terms..
Also, I slept through math class ... so talk slow and use small words LOL ! ( If I'da known that math and chemistry were gonna be that important, I would have paid better attention instead of sketching in my notebooks.. )
marci the chinapainter
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