Variable rate spiral

[Mr. Kevin Noob 0]

Hi all, noob here. I have a design question I was hoping to get some assistance with. I wanted to create a simple spiral, just a line rotating around an axis z. However, I want to be able to change the rate that it is rotating about z. So it would be a spiral that would get tighter as it went, or whatever you wanted hopefully tied to a function. A parabola would make a spiral that starts with slow rotation, gets tighter in the middle, and loosens back up. 

I believe this should be pretty simple but I haven't figured it out. Any assistance is greatly appreciated. (the more detail the better...noob here)

Thanks

[Mr. Carsten Fuetterer 9]

Hi Kevin,

you can use the generic curve and implement the definition of a helix. For the radius, you can define a function, for example a bsplinecurve with 3point. This function can be defined in xy plane, where the y coordinate defines the radius.

 

Attached is an example for this.

 

 

best regards

 

Carsten

helix.fdb

[Mr. Claus Abt 14]

Kevin,

For a spiral surface you can also find a thread here.

Cheers

Claus