Advance surface modelling assistance - 6-sided sketch blend

Question

Hi Community, 🙂I am new in this forum.I have medium experience in Creo Parametric (version 8 ) and have made a lot of 3D and 2D drawings.I will soon get version 12. The reason I am writing in here is that I have just begun my path into advanced surface modelling and that is a steep learning curve. I have attached a render picture of what I am trying to create (made by a friend in Rhino), pictures of my sketches I have made, and pictures of my best result with and without surface analysis.What I am trying to do is to make a surface between the different sketches but no matter what I do, it is either failing, or the surface quality is bad using analysis.  I have used several techniques, and I have also tried to use the Style feature. What I Hope is that you can help to me learn how to do this geometry with a good quality surface. I know I am missing some features, steps or adjustments in order to do this right, but at the moment I have hit a wall with my experience.  Thank you in advance 🙂

DH_14427784 · Accepted Answer

Hi BHOoi, 🙂 I have solved it now.It is a combination of you solution and a course I have just attended.I made the geometry with just 2 surfaces, and the surface quality is good.It is not super robust, but the details can be adjusted make it more robust. After I made my defining sketches, I used the Style command and started by making a curve from one sketch to the other. Then I made the bottom surface which was a 4-side surface followed be the second surface which is a 6-sided surface.  I have attached the result and the Style approach.

tbraxton · Answer

While there are tools for N-sided patches, generally it is better to create 4 sided surfaces. Overbuild a 4 sided surface and then trim it back. I would follow the green boundaries shown below. Pay attention to the construction curves used to define the bounds and their connections such that they support G2 (curvature) or higher order connections where needed. You may need to use composite curves to get a boundary suitable for the goal (#2 in pic below).

To access the n-sided patch you need to set a config option see this article (I am not suggesting this is the best approach to your issue):

https://support.ptc.com/help/creo/creo_pma/r12/usascii//index.html#page/surfacing/surface/To_Create_a_Surface_from_More_Than_Four_Boundaries.html

As an alternative approach, based on the rendered image I see a possibility to use two surfaces of revolution about the holes and an extruded surface in the vertical direction that would intersect the revolved surfaces to generate the core geometry which you would then "patch" with an overbuilt 4 sided surface(s).

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