How can you make a 3D cone shape using flat panels of plastic? Please see further description.?
I am working on an abstract piece to demonstrate tension for my 3D Design art class, and I need to construct a cone-shaped form using flat panels of acetate (thin clear plastic). The cone does not need to end in a “point” rather, I would prefer it ended in the shape of a small circle, a “cut off top” cone, if you will. Are there any sure-fire ways of making a cone shape using flat panels without just guessing (I don’t have an endless supply of acetate, after all!), such as a template or similar? Any and all advice would be appreciated!
Thanks!
I appreciate my first answerer’s detailed instructions! This would probably be a great way to go about making a perfectly conical single piece of plastic, but what i’m going for is to keep the “flat panel” look, like a geodesic dome almost, with metal beams interconnecting them (I have aluminum strips to do so). But again, thank you for your detailed answer!
Well, that other answer basically says “take the flat sheets and bend them with a torch” which would be a lot safer if you put them in a 240F oven and used gloves, http://www.mikegigi.com/whirljig.htm#ANEMOM
but that is not what you asked and the answer is “Sure, calculate the size of a hexagon or more at two heights and use that to make a paper template to cut the plastic”
Suppose you wanted a cone that was 8″ across at the base and the hole was 1″ A hexagon in a circle has six sides with the same length as the radius of the circle, so you would decide on your height, say 10″ and on a paper draw two lines 10″ apart and a perpendicular between them. On one end line you would mark 2″ on either side of the joining line for a total of 4″ long – the radius of a cone 8″ across. on the other end line, 1/4″ on either side, for 1/2″ long, the radius of a 1″ hole.
Now connect the marks from one line to the other so you have a long narrow blunt triangle and use that to cut 6 pieces of plastic to glue together. If you wish, you could make them of paper first to tape up and show that it works.
You can make any number of sides this way, but making to a specific size gets trickier – you can use an online calculator to get the length of sides of circumscribed or inscribed polygons for the two different height circles or you can do it graphically if you know how to divide a circle into equal segments or have a CADD program to help.
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