You can capture the symmetry of the knob in the design intent of the part. You build one half of the sample part in this tutorial, then in the Fillet Features tutorial, you mirror the model to create the other half. Any changes you make to the original half are reflected in the other half.
When you relate features to the origin and the planes, you need fewer dimensions and construction entities, and you can more easily modify the
part.
Click New on the Standard toolbar and open a new part.
Click Extruded Boss/Base on the Features toolbar and open a sketch on the Front plane.
Click Centerpoint Arc on the Sketch toolbar.
Drag downward from the origin, then release the pointer.
A circumference guideline appears.
Click and drag an arc 180° counterclockwise around the origin.
The pointer changes to when a 90°, 180°, or 270° arc exists.
Connect the arc endpoints with a vertical line.
Dimension the arc radius .
Now you add relations and create an extrude feature.
Click Select on the Standard toolbar, hold down Ctrl, then select the vertical line and the origin.
The Properties PropertyManager appears.
Under Add Relations, click Midpoint , then click OK .
The line is now fully defined.
Click Exit Sketch on the Sketch toolbar.
The Extrude PropertyManager appears.
Under Direction 1:
Select Blind in End Condition.
Set Depth to 40.
Click OK to create the extrude
(fr. solidwork help)
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