topic Modeling Help: Protrusion normal to a non‑planar complex internal cylindrical surface. in 3D Part & Assembly Design

Modeling Help: Protrusion normal to a non‑planar complex internal cylindrical surface.

JM_14488784 — Tue, 03 Feb 2026 20:23:07 GMT

I am using Creo Parametric Release 10.0 and Datecode10.0.1.0

Guidance on the workflow to Create a protrusion that stays normal to a complex internal surface.

Re: Modeling Help: Protrusion normal to a non‑planar complex internal cylindrical surface.

kdirth — Tue, 03 Feb 2026 21:04:48 GMT

You can place a point on the surface then create an axis referencing the point and the surface. The axis will be normal to the surface at the point.

Re: Modeling Help: Protrusion normal to a non‑planar complex internal cylindrical surface.

tbraxton — Wed, 04 Feb 2026 02:34:43 GMT

See the solution post in this previous thread it deals with the general problem of holes normal to a surface. A reference model is included which provides an example of how to do this.

https://community.ptc.com/t5/3D-Part-Assembly-Design/Pattern-to-twist-with-a-geometry/m-p/969470#M136234