The SOLIDWORKS Spin Box is the small thumbwheel at the bottom of the Modify dialog box. This can be used to incrementally increase or decrease a dimension value. If the dimension is bounded (i.e. an angle between 0 and 90deg) you may see a slider bar instead.
When you click and drag the thumbwheel left and right, it will increase or decrease the dimension by a set increment. You can also use the Up or Down arrow keys.
An even easier way to trigger the increment change is to place the mouse cursor in the dimension field, then use the middle mouse wheel to go up or down.
The increments are set in the System Options. Choose the Spin Box Increments section to see the set values for English/Metric lengths and Angles. Time would be used more in animations.
Another helpful tip is holding Alt and Ctrl keys when using the Spin Box:
- Ctrl + (arrow/thumbwheel/mouse wheel): Multiplies increments by 10
- Alt + (arrow/thumbwheel/mouse wheel): Divides increments by 10
For example with the options above, the default Metric increment is 10mm each time. It would be 100mm if you hold Ctrl, and 1mm when you hold Alt.
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