I added all dimensions and relations I could think of, but it still show it's under defined. If I click and drag the sketch from any point the whole thing moves and doesn't change shape.

I added all dimensions and relations I could think of, but it still show it's under defined. If I click and drag the sketch from any point the whole thing moves and doesn't change shape.

Where is your Origin Center Point?

I cannot find a single dimension in your sketch which is manufacturable?

The logical location for the Origin would be the center of rotation.

I would -

1. Move the image such that the pin at the center of rotation is at the origin.

2. Scale the image such that one of the easy to measure dimensions matches the real part.

3. Recognize that this is a picture - enter easy to manufacture/inspect dimensions. (take that 82.71884285° dimension out the shop floor and show to machinist and it will take years (if ever) to get back credibility)

I would have used a Circle (arc) or set of tangent arcs rather than the spline.

As a beginner - create each entity and fully define it as you go (don't create entire profile and then try to figure out what relations/dimensions you need).

By your comments alone, I'd say you defined the geometry, but did not link it to the origin.