Invoke sketcher workbench:- START---> MECHANICAL DESIGN----> SKETCHER.
Modifying Units:- Default unit is Millimeter (mm). If you want to set other units. The units for length, angle, time, mass and so on.
TOOLS--->OPTIONS---->UNITS
Modifying the Grid Settings:- When you invoke the Sketcher workbench, two types of lines are displayed in the geometry area, one in the horizontal direction and the other in the vertical direction. These are continuous lines and dotted lines, respectively. The spacing between two dotted lines is called graduation and the spacing between two continuous black lines is called primary spacing. The mesh that is formed due to the intersection of these lines in the vertical and horizontal directions is called grid. In other words, primary spacing and graduation define the grid.
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