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Drawing or creating some guides

Mans

Member
I can't use loft between two profiles that are not similar to each other (for instance, a circle and a rectangular in two different parallel planes). When I loft them, an error message is appeared and a 3D body with an abnormal shapes appears. Catia recommend me that I have to use guide. I don't know how to draw those guides so I use some points on the circle and connect them to the corner of the rectangular as the guides but catia doesn't confirm them. please tell me how I can create guide for lofting.
 

MrCATIA

Super Moderator
Try this:

1. switch to GSD workbench
2. project a corner point on the rectangle to the circle
3. draw a line from the corner point to the projected point, or draw a spline between the two points with tangent directions on the ends
4. repeat steps 2 & 3 for each corner of the rectangle
5. create your loft (I'm not sure which command you're using), but add the 4 lines as guides to control how the loft will flow between the sections
 

MrCATIA

Super Moderator
Instead of Guide Curves, I often find it's easier to use Control Points to define the flow between sections. I like to Project the corner points onto the circle, and then select each set of from/to points.
 

Mans

Member
How do I project a point on the rectangular corner? When I do this in GDS, this error message appears:


;
 

MrCATIA

Super Moderator
first of all, exit the sketch.

Then go the the GSD workbench. (You could also use the Wireframe workbench)

Then use the Project icon, and project the vertex (cornerpoint) onto the circle.
 
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