wrap a wire around a cone [urgent]

sophiecentaur

Quote by rcgldr

I have the impression that what the OP wanted is equal length segments as the wire wraps around. For opened up surface, this would mean a spiral with equal length segments every 360°. This would require a huge pitch at the start (nearly radial), and then nearly horizontal at the end. I'm not sure if it's even possible to get 2 complete wraps with "equal length" segments.

I'm not sure why the OP didn't want the spacing between wires to be constant, which would translate into an Archimedean spiral (r = a θ + b) on the opened surface.

Yet again we suffer from not knowing exactly what was wanted. Should we devise some sort of pro-forma for practical enquiries (assuming this really was one), including a box for "what do you think the finished product will look like"?

I was assuming it was some electrical appliance which needed equal heat output per unit length for an element wound round a conical former. Yours sounds more like a question that a Mathematician would ask. I wonder which was the original intended question.

*Helpls*

sorry guys, just read this now i already wraped the wire in one of the cones, i m not a expert in maths geometry etc thats why took me so long to figure out the sophiecenta formula :D i will draw some things, to explain what my experiment is about, so u guys that are more smart than me, maybe if interested try out :D

it will take some time cuz i want to write and draw my ideias.

rcgldr

Quote by rcgldr

I'm not sure why the OP didn't want the spacing between wires to be constant, which would translate into an Archimedean spiral (r = a θ + b) on the opened surface.

I should have stated this as the 3d cone eqivalent of a 2d Archimediean spiral, one with equal spacing between loops of wire. For a 3d cone in spherical coordinates, this tranlates into ρ = a θ , ϕ = constant.

An unrolled cone only forms a partial disk, so I'm not sure it's a good analogy to use.

*Helpls*

i had i new ideia :D we can use the same method of tesla coils use convert an DC to AC and give a bit of electrical charge that the antena needs, and see if it starts to resonate. Then i dont know how convert agian to DC and see how much we get out of it :D

micromass

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Helpls	sorry guys, just read this now i already wraped the wire in one of the cones, i m not a expert in maths geometry etc thats why took me so long to figure out the sophiecenta formula :D i will draw some things, to explain what my experiment is about, so u guys that are more smart than me, maybe if interested try out :D it will take some time cuz i want to write and draw my ideias.

micromass Mentor Blog Entries: 8	Locked pending moderation