Cannot put radius on half circle

[Anonymous]

Hi, I just received a part which I'm making a drawing on. I cannot put a radius on that half circle. What can be the reason?

I attached one screenschot.

Kind regards

Joakim

[Mark.Lancaster]

@Anonymous

Its hard to tell by the image (arc looks rough) but is it an actual circle/arc entity?  Can you provide the part so we can review it?   Inventor version too?

[TheCADWhisperer · Accepted solution]

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@Anonymouswrote:

.... What can be the reason?

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Could be spline curve rather than a true geometric circular arc curve.

If it is a spline  - you can either Retrieve the dimension from the generating sketch or feature

or

start a new sketch in the view

Project Geometry

create new arc overtop the spline (and constrained to the spline)

Exit sketch and then dimension the true arc.

If you can't figure it out - as suggested, attach your files here and end all doubt.