Parametric Dimensions
In SolidWorks, dimensions drive the model geometry; changing dimensions changes the shape of the model. You can relate dimensions to each other in equations.
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1. Open a sketch, sketch a rectangle, and dimension the rectangle.
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2. Modify the dimensions as needed while creating the sketch.
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3. Extrude a block base feature.
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4. Complete the feature to close the sketch and show the solid in shaded mode.
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5. To modify the block, edit the sketch, double-click a dimension and modify the value.
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6. Exit the sketch to rebuild the solid with the new dimension.
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Note: You can also use Instant3D to modify model geometry.
See SolidWorks Tutorials: Lesson 1 - Parts