Need some help on how to duplicate-offset this curve on the surface and shown on the second picture. Ive been trying several hours now and Im out of ideas. Any help appreciated!

Cheers
Nick

Hello,

Your model is a bit out of square, that may be causing a problem, but I recreated the area of interest. Remake the line drawing you used to Revolve but extend it downward on Z to give you something to work with that you can cut away at the correct time. Revolve your shape into a solid and make a copy of the solid. Hide a copy of the solid, and then run an Inset command on the inside surface where you want the line to position. Select the top and side line from the Inset command and select Join. This should give you a curve tracking the inside of your revolved shape. Then delete the inset solid and unhide the original solid and perform a Boolean Difference at the appropriate Z depth. You should be left with something like the picture. Keep in mind that more control points will not help your situation, if you need a video I think I can get one out shortly. Hope this helps.

Hi Nick, another possibility could be to draw a circle off to the side a bit, then select the circle and run Construct > Sweep, then select the path curve and you will then have a tube object that follows along your path curve.

Now with the tube in place, select the tube and the face that you are interested in and run Construct > Curve > Isect - that will calculate an intersection curve between the tube and the face and that looks like the kind of result you want.

See attached 3DM file with the tube and intersection result in place.

- Michael

Or another possibility using surface offsetting similar to described before could be to select these 3 faces:



Then run Construct > Shell and choose a pretty small thickness value. That will leave those faces in place to become openings, and the surrounding surfaces will get offset and intersected with the original surfaces, making edges like this:


So then select those edges, use Ctrl+C to copy them to the clipboard, undo to revert back to the pre-shell state, and then use Ctrl+V to paste in the curves you want.

- Michael

Thats outstanding guys! Thanks alot for taking the time to help me on this.