How do I add offset lip to 3D curve ?

[Crossfire12]

Let's say I have an arbitrary 3D shape that has been shelled and cut along a spline. I want to add a lip to the highlighted edge (in order to snap two halves together). The section analysis should look similar to the green mockup on the side. What's the best way to go about this?

If the body gets cut by a plane then I can simply create an offset edge and extrude that. But I am unable to do this with a 3d curve like the one in the sample. 

[SaeedHamza]

Could you share a picture of what you're trying to achieve?

I'm not quit getting what you want

Regards

[beresfordromeo]

Do you mean like this? It is hard to tell because the green geometry/profile in the model doesn't seem to be to the same scale.

[Crossfire12]

Thank you beresfordromeo. That's the end result I am looking for!

Would you mind doing another screencast showing your earlier steps?

Thank you!

[Crossfire12]

Never mind. I was able to achieve the results with a couple more attempts. Steps:

- shell the sphere to desired wall thickness

- copy/paste sphere to new body (this new body will become the lip)

- shell inside and outside faces of sphere to truncate it into a ring

- use push/pull on top and bottom to make that ring smaller so it fits into the original sphere

- use push/pull on front face so it sticks out

- apply chamfer as needed

[beresfordromeo · Accepted solution]

Glad You worked it out. 

I have recorded screencast for the setup of the profile. I am sorry that I did not include it in the original screencast but I wasn't sure that this was what you were intending.

In short you can create a construct > plane along path on the inside edge of the sphere.

You can use this plane to create a sketch into which you can sketch > project/include >intersect the profile of the sphere.

Once you have this projection as reference geometry you can sketch the profile of the lip that you wish to add. Please note that I did not use a straight line on the connecting geometry between the last edge of the lip profile and the existing projected edge of the sphere. I used a spline for that and made it tangent to the projected inside edge of the sphere. Using a spline instead of a line for this is not necessary but in this case it demonstrates that if you wished for a tangent curve instead of a hard edge you could do that and there could be some downstream benefits to doing so.

After that I used the create > sweep command as you saw in the previous screencast.

I hope this is helpful and makes sense. Best of luck with your project.