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SW2009 - Problem with creating 3D line tangent to helix

SW2009 - Problem with creating 3D line tangent to helix

SW2009 - Problem with creating 3D line tangent to helix

(OP)
I used to be able to do this in SW2008 but have not been sucessful in 2009.  Can anyone advise me what I am doing wrong?

I create a helix.
I then open a 3D sketch, draw a random line. The endpoint is placed on the helix - so far so good.

Now I want to make the line tangent to the helix at that intersection point - it does not let me add the sketch relation.  

Ultimately I am after a line perpendicular to the helix, but even in SW2008, it did not let me do that, the best i could do was draw a tangent line, and then draw another line perpendicular to that one.  I cant even do that in SW2009.

My old SW2008 files that were converted to 2009 still work.  I am trying to create a new one.

Any ideas?

RE: SW2009 - Problem with creating 3D line tangent to helix

Use "Convert Entities" to bring the helix into your sketch and constrain t that.  Make the converted helix a construction entity if you must.

RE: SW2009 - Problem with creating 3D line tangent to helix

Making a tangent to the parent circle is not the same thing since the helix angle is not parallel to the circle plane.

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CSWP, BSSE
www.engtran.com  www.niswug.org

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RE: SW2009 - Problem with creating 3D line tangent to helix

(OP)
Tick
Converting entities fixed this
thanks

 

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