You can select geometry to drive the limits of width mates, eliminating the need for numerical input.
When you create a width mate, you can select the following options to define the limits of the mate:
Centered
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Centers a tab within the width of a groove. This is the same functionality as in previous releases.
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Free
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Lets the components move freely within the limits of the selected faces or planes with respect to the components.
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Dimension
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Sets a distance or angle dimension from one selection set to the closest opposing selection set of faces or planes.
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Percent
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Sets the distance or angle based on a percentage value dimension from one set of the selection set to the center of the other selection set.
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To set these options, click Mate (Assembly toolbar) or . In the PropertyManager, under Advanced Mates, click Width and set the options.
See SOLIDWORKS Help: Width Mates.