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Good morning everyone!
I sketched on the front plane.
Now I have no idea how I am able to put the hole on the top of that??
I am still confused about the advantage of Convert Entities?
And I do not know what's wrong with the third image. What is the usefulness of creating a plane in Insert/Reference Geometry?
Every feedback is much appreciated!
I think you probably want to make that round boss on top before you put the hole in. To do that you have a couple options. One is to sketch the circle on the top plane, then start the Extruded Boss command. In the "From" box at the top you can pick "offset" and set the offset to 70 mm, then in the "Direction 1" drop down menu pick "Up To Surface" and select the top of the arch. That should make the boss and then you can create the hole from the top of the boss.
Another way to make the boss would be to make a new plane that is offset 70 mm from the top plane. You can start the Plane command and for your first reference pick the Top Plane, then choose the distance option and set the distance to 70 mm. Then sketch the boss circle on that new plane, start the Extruded Boss, and do it "Up To Surface" like I described before.
If you've already created the sketch to put the hole at the top of the body, and closed it (so the sketch is no longer active), right-click on the sketch and choose the "Edit Sketch Plane" icon. Then select the Top Plane. After doing this you may need to edit the sketch since some relations may be lost. The plane used for a feature sketch doesn't need to be in contact with the cut, so the Top Plane can be used. After moving and editing the sketch you can select it and use it for an Extruded Cut, choosing "Through All" for the End Condition.
If you just want to create a plane directly at the top of the part, then activate the command, as in your third screenshot, choosing the curved surface for Tangent, then select the Top Plane for the Second Reference and set it to Parallel.