I am having trouble figuring out how to establish Datum B (see attached). It creates that midline the red arrow points to, but it seems to be a line and a point. Does anyone have any advice on how to create that midline from a straight and curved feature?
UPDATE: SOLVED. See
neil.challinor's reply/following comments for how I created a tangent line from a circle point.
It may not be 100% correct but in this instance I would probably align to A/C/D and since the radius is so large and such a small segment of the complete circle I would take 2 equally distant points on both sides of the radius using the C/D midline. (i.e. +10mm and -10mm) Then I would take a point at the peak of the radius and offset that line to the peak..... Then use that line to create your midline for datum B. You just have to be careful about your points on the radius and ensure they are hitting correctly and evenly.
To locate your target points for C and D you can use the bottom half of Datum B since you have a basic to the midplane and from the midplane you have basics to your C/D targets. Once you get your initial alignment established I would follow up with a secondary alignment to more closely and accurately locate all of your datum features.
Other than that I cant think of a way to create a midplane from a radius and a plane.
