Setting and changing the grid and snap alignment
Grid and snap settings are effective tools to use in your drawing to ensure accuracy. Although many users find it convenient to match grid points to snap settings, they are independent of each other and should not be confused. Grid points are for visual reference only; they do not affect your drawing and they do not print. Snap points are, by themselves, not visible; however, when set, they constrain the creation of new entities.
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Setting a reference grid
Setting snap spacing
Changing the snap and grid angle and base point
Using isometric snap and grid