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Author Topic: cuting snails and helices (helixes?) - parametrics problems  (Read 5333 times)

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Re: cuting snails and helices (helixes?) - parametrics problems
« Reply #10 on: June 03, 2010, 04:33:03 AM »
Did you start from dead centre of the helix? It doesn't like that.

Offline stirling

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Re: cuting snails and helices (helixes?) - parametrics problems
« Reply #11 on: June 03, 2010, 05:34:20 AM »
Just flat helixes, or helices or whatever they are when they're at home. Any clues?  ???
Just a thought on this for fun. I don't think they're either. A helix is a 3D object based on a cyclinder or a cone. This is 2D and more like - well - a snail - or a spiral. The crux is a "true" helix has a cartesian equation that defines it - like a circle, elipse, parabola or whatever. A spiral on the other hand generally doesn't - though you could probably define a conic helix with zero Z that would - but being 2D would it be a helix? FWIW The one here is made how they usually are i.e. via a progression algorythm. Yaddayadda  ;D

Ian

Offline ger21

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Re: cuting snails and helices (helixes?) - parametrics problems
« Reply #12 on: June 03, 2010, 08:35:37 PM »
All you want to know about spirals.
http://mathworld.wolfram.com/topics/Spirals.html
Gerry

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Offline stirling

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Re: cuting snails and helices (helixes?) - parametrics problems
« Reply #13 on: June 04, 2010, 03:34:13 AM »
Nice one Gerry. Seems I was quite wrong - oops sorry folks. The blurb I'd read all did sprals by some sort of progression. All the ones I looked at in your link do indeed have a cartesian equation of some sort. Live n learn.

Cheers

Ian