About Creating a Draft Grid
Using commands in the GRID MODIFY menu (Click > 
Draft Grid on the menu bar), you can create two types of draft grids in a drawing: Cartesian and Polar. The system creates a Cartesian grid by locating points on a plane, measuring their distance from either of two intersecting straight-line axes along a line parallel to the other axis. It creates a Polar grid by locating points in a plane, measuring their distance from a fixed point on a line and the angle this line makes with a fixed line. To change from one type to another, choose Type from the GRID MODIFY menu.
Draft Grid on the menu bar), you can create two types of draft grids in a drawing: Cartesian and Polar. The system creates a Cartesian grid by locating points on a plane, measuring their distance from either of two intersecting straight-line axes along a line parallel to the other axis. It creates a Polar grid by locating points in a plane, measuring their distance from a fixed point on a line and the angle this line makes with a fixed line. To change from one type to another, choose Type from the GRID MODIFY menu.When using a two-dimensional draft grid in a drawing, keep in mind the following.
• The grid snap falls on the grid lines when grid snap is on (set in the Environment dialog box).
• The grid origin and angle affect the coordinate values specified for geometry points. The x-axis is always along one direction of the grid, while the y-axis is along the other.
• The grid origin affects the coordinate values appearing in the message area when sketching.
• If you use the GET SELECT menu to select an entity, the entity does not snap to grid.