When using AutoCAD to create an isometric drawing it is best to set the grid to ISO.

An isometric drawing is a type of technical drawing used to illustrate a mechanical part in true 3-dimensional form.

The bounding box method for creating an isometric drawing works well in both traditional board drawing and in AutoCAD.

Most solid modeling CAD programs will produce pictorial drawings of 3-dimensional objects using either the isometric, perspective, or both views.

The primary difference between isometric drawings and perspective drawings is that in an isometric drawing both vertical and horizontal lines remain parallel while in a perspective drawing both horizontal and vertical lines are in line with an apparent vanishing point.