hyperboloids

[pagheca]

Hi,

Do anyone knows any way to draw an hyperbole, guys? A parabola or an ellipse is not enough

Cheers & thanks in advance.
p

 

[Regg]

pagheca,

I assume you meant hyperbola. Hand enter the data into the curve feature. Generate the data in an exteral program, save that data as a text file then create a curve through XYZ points by using the import file option. You might be able to do it through a macro? I did a quick look through API help and did not see anything for generating a curve through points so maybe not? You also may be able to use the spline tool?

Regards,

Regg

 

[pagheca]

Hi Regg,

Thanks for your suggestion. Sorry for my bad English. I was talking about an hyperbola.

The problem is that I would like to model some optics and parametrize the design of a telescope mount. The idea was to parametrize the optics so that the mount may be adjusted quickly as soon as the optics layout is changed.

This would be difficult with the solution you mention (interpolating the function in an external sheet), but is one of the best solution I can see.

Another solution is to use an equation that does the same computation but inside SW and adjust it with spline. Not perfect but may work.

I wonder if SW2006 or following versions has this feature (hyperbola) or a way to define a generic curve by its equation, that could be more interesting when you have to parametrize a profile with very high accuracy.

Cheers,
p

 

[Regg]

pagheca,

Well depending on the number of points to make the curve, you could either use a spline or a curve through reference points. Dimension each point and then put the point dimensions into a design table. You can write your equation in the design table to update the point dimensions. If the equation is linked to some parameter in the model that changes the curve, then by allowing model updates in the design table, all you would have to do is open the design table so the curve point info would update and then close the design table.

Regards,

Regg

 

[TheTick]

This discussion came up in another forum once. The best solution to create a true parabola was to create a conic surface and intersect it with a plane at the correct location and angle.

Otherwise, calculate pint locations and aproximate with a spline.

 

[Jabberwocky]

Like TheTick says, use a conic surface and intersect it with a plane using the "Intersection Curve" Sketch Tool.

There has to be an equation relating the parameters of the conic and the coordinates of the plane - although I don't know it off-hand.