Hyperbolic Helicoid. HyperbolicHelicoid
Thanks to Brian's formulaic equivalents to sinh and cosh I've got this working.
HyperbolicHelicoid.nod produces a surface which is easily converted into a solid by executing Construct/Offset/Shell using Thickness 0.01mm (for default .nod values) and Direction: Normal
![](get_attachment.php?webtag=MOI&hash=7a242ef03ffc35150232eccd8965361c&filename=HyperbolicHelicoid.JPG)
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