@pilou said:

a brute method Thx Fredo6 and its versatile Curviloft

Kill surfaces and segments for keep only circular curves

you can make the same with other if you want truncated conic volumes

Funny i have made a conic form few days ago for the free Simlab Composer Lite (max 1920 *1080)
(geometric caterpilar curves + spheres )

Thanks! I used the Skinning tool and that did exactly what I wanted; creating a surface along the arcs I created to get a smooth transition from the lozenge to the circle.

Thanks so much for helping out. I am not back on track!

Good evening all,

This is my first post here, even though I have used this forum often to answer questions that have come up as I have use Sketchup. I have run into an issue which I haven't been able to solve on my own, so hopefully someone here can help.

I am trying to connect a hollow cylinder which is lozenge shaped to a hollow cone which is circular. This connecting piece will transition from the lozenge to the cone via an arc.

Here is what I have done so far:

1. I made a circle matching the diameter of my cone and hollowed it out.
2. I made another circle matching the diameter of the lozenge and hollowed it out.
3. I drew an arc connecting the inside and outside of my two circles.
4. I used the Follow Me tool to draw the arced cylinder.

That all worked great, as I had my cylinder. You can see this in the attached SU Make 2017 lozenge to circle along arc.png. I made the green cylinder as described above, which connects to the gray cone on the right and the purple/yellow lozenge on the left.

Now I have my cylinder, wanted to transform the wider end into a lozenge using some tips I found at in this forum topic:

https://sketchucation.com/forums/viewtopic.php?f=79&t=43234

In spite of the good instructions in this topic, I am not getting the desired results. Instead of transition the cylinder along its entire length, it will only do so in the first segment, or I end up with lozenges at both ends instead of just one.

Do any of you have any thoughts as to what I am missing? I have also uploaded a Sketchup Make 2017 file of the model (SU Make 2017 lozenge to circle along arc.skp) if anyone wants to take a look at that. If you do, please note that I separated each piece by 5mm eliminate z-fighting.

Thanks in advance for taking a look at this.

Chris

Sketchup Make 2017 model