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CAD tip CAD tip # 7800:

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Q - question

How to model a 3D hyperboloid?

A - answer The surface of a 3D hyperboloid is a ruled surface. So use the AutoCAD command RULESURF. The control edges may be two circles or ellipses (in a polyline form), with offset (twisted) origins. Use e.g. PLINE,Arc with two 180° segments, copy the circular pline in Z axis and rotate it (e.g. 2/5 of full circle - 144°).

There are two important variables for creation of a ruled surface (model) - SURFTAB1 (surface smoothness, e.g. 24) and MESHTYPE (surface/mesh type, e.g. 0).

An example of a hyperboloid created this way can be found in the Block catalog:


Similarly, in Inventor, you can use lofting with two parallel circular paths - see the parametric IPT model:


100% *  CAD 
17.2.2011    7086x  
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See also:
Tip 11311:Importing STL files directly into AutoCAD.
Tip 9735:How to convert a .THING file to a 3D CAD model?
Tip 9711:3DConstruct - converting a 3D mesh to a frame construct
Tip 9512:How to convert a point cloud to an editable 3D CAD model (mesh)?
Tip 8903:Draw normals of 3DFaces in AutoCAD DWG.

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