using multiple profiles on sweeps

Hi.

I am using 2004, and I am trying to create a picture frame shaped part where
there is a different profile for each of the 4 sides. It is easy to define a
rectangular path, and one profile and have the corners miter properly, but
if I want to have one of the sides of this frame a different profile, I
can't seem to make it work. For example, consider a rectangular frame with
an air-foil like profile for three sides, with the remaining side having a
similar profile, just wider. How would you do that with sweep and have the
"corners" resolve properly.

Thanks, David Wurmfeld.

 

Use 2 guide lines and constrain the profile sketch to both of them one
representing the inside and the other representing the outside. If they are
offset it should miter like you wish.

Corey

 

Ok that won't really work. How about drawing both the inside rectangle of
the frame and the inside of the frame sketch your first side of the frame
and extrude to the corresponding outside length. Then make a cut at the
propper miter. and sketch the second side using the mitered corner convert
entities and extrude using the second line as the direction and the length.
Repeat until you have a propper frame.

 

This was discussed some time ago. Ed Eaton used it as an illustration of why
sweeps aren't such a good idea some times. The sweep basically automates a
loft for you . You can see the loft profiles that it generates by clicking
at the little spectacles at the bottom of the guide curves box, then rolling
through them. When you think about it, it's a miracle that sweeps work at
all.

Jerry Steiger
Tripod Data Systems

 

Did you try a loft? Maybe use Derived Sketches for similiar sketches too.

Ken

 

Try a sweep around 3 sides, then miter the ends with a cut and do an
extrude up to surface. I don't think you'll find a way to do this with a
single sweep.

http://users.adelphia.net/~mjlombard/whatsit.SLDPRT

If all 4 sides had different profiles, I would do 4 extrude features.

matt

 

I'm having trouble imagining it in the real world. I can see the corners
mitering, but if one of the profiles is different, doesn't the transition
have to be some sort of blend or something? Or a gap?

Now, you CAN have a different profile along one segment and everything
connecting with no gap if the miter angle doesn't connect with the opposite
corner. For instance, on a square, the upper mitre would have a 50-deg or
60-deg angle instead of 45-deg. In that case, the easiest is to sweep the 3
sides around a U, chop the 50/60-deg mitre at the top, then loft from face
to face to create the top section (no guide curves necessary, no start or
end tangency)

Please tell me how far off I am.
-Ed