topic Re: align objects on a non-orthogonal plane in Fusion Design, Validate & Document Forum

align objects on a non-orthogonal plane

AagAag — Fri, 21 Jun 2019 21:57:29 GMT

I need to align the center of a light source to the center of a mirror that was constructed on a plane tilted 45° to the light beam. I thought of using the sketch projection feature, but that appears to always project objects orthogonally to the sketch plane. Is there a clean parametric way of resolving this, or do I have to resort to brute-force trigonometry? Many thanks for any help/hint!

Re: align objects on a non-orthogonal plane

HughesTooling — Fri, 21 Jun 2019 22:13:40 GMT

Have you made all the parts as individual components and followed Rule #1? You should be able to project a point on to a sketch created on the angled plane, then add a joint origin in the correct orientation. Then use a rigid joint between the back of the mirror and the joint origin.

Mark

Re: align objects on a non-orthogonal plane

AagAag — Sat, 22 Jun 2019 06:21:13 GMT

Thank you! Are you saying that I should create the mirror and first place it orthogonally to the light source using a projected point, and only then tilt it using a rigid joint? Just making sure I understand...

Re: align objects on a non-orthogonal plane

HughesTooling — Sat, 22 Jun 2019 09:26:54 GMT

After mocking up a simple model I think I see the problem. Does the screencast below help. You can't just use a constitution point on the plane because its orientation XYZ are not perpendicular with the plane so I created a sketch on the plane and projected the construction point on to it.

Mark

Re: align objects on a non-orthogonal plane

HughesTooling — Sat, 22 Jun 2019 09:41:18 GMT

I don't really like the method above but if you are working with existing components you'll need something similar. Here's another way building the mirror inplace. This way seems a lot cleaner way of doing it with less features.

Mark

Re: align objects on a non-orthogonal plane

AagAag — Sat, 22 Jun 2019 09:46:26 GMT

ahh, this is of course the way to go! Thank you so much for spending your Saturday morning (EU time) to help me; I feel grateful and indebted! I will post the project as soon as it can be shown without embarrassing mistakes. 😉

Re: align objects on a non-orthogonal plane

etfrench — Sat, 22 Jun 2019 18:11:14 GMT

Here's another way to do it: