In autocad, besides using the Snap command, you can also set snaps through the CAD drafting setting box.
Right – click the Snap button, and select Setting in the right menu to open the “ drafting settings” dialog box (e.g. picture 1), in the Snap bar, set the accurate distance between axis X and Y, or set the polar distance of axis. Then set the Grid snap or the Polar distance snap in the “snap type” area.
Picture 1: drafting setting dialog box
Attention: you can create 2D axonometric drawing through Isometric snap and Grid operation. Through the Isometric operation, you can create 3D view by using the method of creating 2D plane, but the axonometric drawing is not the same as the 3D drawing, only in the three dimensional space can a 3D drawing be created. It often uses three designed planes in the Isometric methods: the left view, the right view, and the top view. Clicking F5, you can switchover the Isometric planes ( left, right or top views)
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