What's the distinction between "Create Sketch", "Solid", and "Surface"?
Accepted solution
A sketch in Fusion 360 can only contain points lines and curves. Curves might be arcs/circles, fit-point splines or control point splines. Sketch geometry is held together by constraints.
The rectangle sketch primitive, for example contains 4 lines that are held together by coincident constraints between the line end points. Then the lines have horizontal/vertical constraints applied to them, so the rectangle maintains its rectangular shape when its location or dimensions are modified.
The purpose of a sketch is to provide simple base geometry that can then be used to create 3D geometry. you can extrude, revolve, sweep, or loft sketches into solid bodies (BRep) or surfaces. Working with surfaces is often used when it involves arbitrarily curved geometry called NURBS.
Working with surfaces allows to create geometry that is not possible with the solid modeling tools in Fusion 360.
In most cases the desired end result is a solid body (BRep) so surfaces can be stitched together to form a solid body.
You can also make 3D sketches but for most applications those aren't needed.
@Anonymous
Notice that your Sketch1 does not have a lock symbol.
This indicates that your sketch is not fully defined.
Always reference it to the Origin. (Like setting a Home Position on a Router, Mill or Lathe.)
Note the symmetry about the Origin.
Continue that symmetry in the creation of features.
Tip: Long left click to cycle buried profile selection...
You can easily edit the sketches (I made errors in original) if/when needed (see Attached file).
(I made a change to your Fillets that might not be acceptable.)
