Now it’s time to deal with the dome-shaped hole on the base. This is a little more complicated than the other holes, but still not too difficult.
Go to the Mesh Tab → Select Create Mesh section → Click on the model, and select a plain → Then adjust its position if needed → Sketch the hole → Extrude and cut.
Next, we’ll create the dome part, this is a several-part process, so we’ll break it down step by step. To start, we’ll create an axis through the circle’s center.
Go to the Create menu → Select Axis through Cylinder → Click the circle’s center point → Click Ok.
Next, we must create a vertical plane for sketching along the axis we just made.
Go to the Construct Menu → Select Plane Along a Path → Select the Circle → Adjust if needed → Click Ok.
Then create another mesh section through the created plane, then sketch.
Go to the Mesh Tab → Select Create Mesh section → Click on the original model, select a plain → Then adjust its position if needed.
This one requires a little planning but is less work than most other sketches because we will revolve this sketch around a point, so we only need to sketch half the shape.
You may have noticed that the sketch below doesn’t follow the outlines of the mesh sketch, and the reason for this is that the mesh sketch isn’t remarkably accurate, and it was only done to get a general idea of the dome’s curve.
Use the Line Tool to make through the circle’s center point → Then another one along the dome’s roof → Use the Arc Tool to draw the dome’s top curve. → Make a construction line across the top of the hole.
And then, draw a straight line from the curve’s top to the center axis using the Line Tool. → Use the Offset Tool for the lower half of the dome’s curve. → Close the curve at both ends. → Cut any excess lines.
Now it’s time for our first and only Revolve Extrusion, which will create the shape of the dome around the center axis point made earlier. The Revolve tool makes it extremely easy to create any circular areas needed.
Next, we need to Extrude and Cut the dome’s base downwards to finish the dome shape.
The dome still needs a bit more work to match the original as the dome we made edges’ are sharp while the originals are smooth.
Go to the Solid Tab → Select the Fillet Tool → Select the edge for curving.
It helps to compare it to the base model as you adjust to find the right amount.
Ok, now with the dome finished, it’s time to smooth out some other sharp circular edges with the Fillet Tool.