How can I model the fillet / curvature at top end of the opening? I have modeled the lug itself without the fillet but standard fillet operation does not give what I am looking for.
You have to use some more features. Besides a fillet is by definition tangent to its neighbouring faces and this is not the case in your request.
I would do something like this:
Thanks for the new technique.
I couldn't understand the need for delete face.
You can use Radii Variable....look
Thanks. Works well for me
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