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Create the shell
In project Schematic, double click on Geometry to open the Design Modeler. When prompted, select Milimeter as the unit.
Click on the XY Plane and the z axis to begin sketching. Use the Linetool to create a vertical line starting from the x axis. Hover the cursor around the axis until you see a symbol C to begin your sketch. The symbol C means the line is coincident to the x axis. Next, use the Arc by Center to create the dome of the shell. Hover the cursor near the y axis until you see the symbol C. Single click on the y axis and click again on the tip of the line you have just created. You should see a symbol P when you click on the vertex, which means coincident. Finally, click on the y axis again to finish the arc. Use the General dimension tool to create dimensions for the line and the radius of the arc. The length of the line is 30 mm and the radius of the arc is P25 mm. Your sketch should look like this:
