Rick Creuzburg wrote:
Is there a way to define the section plane at the centre or tangency of a cylindrical part?
(or using a sketch line or an axis etc)
It is possible to mate the section line to existing geometry, however it is not terribly straight forward. In the past, I've edited the section line sketch and then showed the related sketch on the part file so it shows up on the print as well. Then I can select the sketch point that created the feature and then the section line to make them coincident.