serpentine curve on hemispherical surface

I'm stumped. I'm trying to create a serpentine path on a 1/3
hemispherical surface so I can create a cooling tube which winds back
and fore on the surface. I've tried all sorts of 3D sketches, but
either the horizontal lines won't stay horizontal or the bends at the
end won't stay tangent to the horizontal lines.

I can send an image of what I've got if anyone can help. email is
parkatsensortrandotcom

Imagine a vertical orange slice (120 degrees wide) cut in half and the
curved surface has a continuous line on it that zig zags back and fore
horizontally. The horizontal line are 50mm apart with a 25mm radius
curve at the ends.


Brian Park
Sensortran

 

hey,

can you try creating the horizontal lines as surfaces (extruded), which you
then fillet to get your end rads and then trim back to the curve of the
'orange' - then use the edge of teh trimmed surfaces. Not really sure I'm
getting it from your description!

 

Have you looked at using the wrap function?

 

http://www.mcadforums.com/forums/viewtopic.php?p=47782#47782

 

If the "WRAP" tool doesn't work you could try GeometryWorks
(http://www.cadcamcomponents.com/index.cfm?fuseaction=home.main)

Kev