A Single Loft Profile on Two Different Planes - End Conditions Problems

Caspar

Hi All,

I have created a loft; the starting profile is a cylinder, the single end profile on two separate planes oriented at right-angles.

The end condition between the loft on the cylinder is correct.
The end condition between the loft and the front face is also correct

I would, however, like the bottom 'end profile condition' to be normal to the 'top' plane as per the picture below

Can anyone help, please?




https://cad.onshape.com/documents/8a96dee91ad3e39df20d496a/w/cf4b5927819565ca38745134/e/9091056c8f57398570985e77

Many, many thanks,

Caspar

John_P_Desilets

Hello @Caspar

This is a difficult surface to create in one operation. Completing smaller regions of the surface transition will yield better results in this situation. These profiles are very different from each other and will need a lot of help to guide each surface.



In this example I added additional splines to help construct the wireframe for the transition. 



Next, I split "sketch 6" where the first surface will end.  



Next I built the first surface as a loft. 




The next feature is a "fill" surface. The "new" option was chosen so the surface could be mirrored to the other side after the operation.



Last step, I mirrored the filled surface using the right plane. The checkbox option "merge with all" combines all surfaces together. 




This is the link to the Document that was used for the above screen shots. Hope this helps and good luck! 

https://cad.onshape.com/documents/207d0f0553efb6650f20270f/w/db173b88001d6fb0bf641b82/e/8afa30ceeb57fc69bbb4f5a6
  

Caspar

Exactly the outcome I was looking for, and nicely explained. Thank you.

Caspar

Update:

I have managed to change the bottom end profile condition but a nasty crease still remains...

John_P_Desilets

Hello @Caspar

This is a difficult surface to create in one operation. Completing smaller regions of the surface transition will yield better results in this situation. These profiles are very different from each other and will need a lot of help to guide each surface.



In this example I added additional splines to help construct the wireframe for the transition. 



Next, I split "sketch 6" where the first surface will end.  



Next I built the first surface as a loft. 




The next feature is a "fill" surface. The "new" option was chosen so the surface could be mirrored to the other side after the operation.



Last step, I mirrored the filled surface using the right plane. The checkbox option "merge with all" combines all surfaces together. 




This is the link to the Document that was used for the above screen shots. Hope this helps and good luck! 

https://cad.onshape.com/documents/207d0f0553efb6650f20270f/w/db173b88001d6fb0bf641b82/e/8afa30ceeb57fc69bbb4f5a6
  

Caspar

Exactly the outcome I was looking for, and nicely explained. Thank you.

matthew_stacy

Exploiting the inherent symmetry of this part would significantly the work.  Regardless of how you attack this problem, consider mirroring everything about the Right plane near the very end of the feature tree.  Starting all the way back at Sketch4 (Extrude1), just sketch the front (or back) half.  This is particularly helpful when you get to the Loft Splines.