Hello Guest it is September 29, 2020, 05:01:14 AM

### Author Topic: cuting snails and helices (helixes?) - parametrics problems  (Read 5645 times)

0 Members and 1 Guest are viewing this topic.

#### BluePinnacle

• 304
##### 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.

#### stirling

• 2,188
• UK
##### 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

Ian

#### ger21

• 6,285
##### 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

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html

#### stirling

• 2,188
• UK
##### 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