Preparing to draw in isometric — initial AutoCAD setting Before starting an isometric drawing in AutoCAD, which setup step should the drafter perform to align the drafting aids with isometric axes?

Introduction / Context:
AutoCAD supports isometric drafting by adjusting the snap/grid and cursor to the three isometric axes. Proper initialization saves time and prevents errors when placing edges at 30 degrees and verticals, and when drawing isocircles on the correct isoplane.

Given Data / Assumptions:

• The user is about to produce an isometric view (2D representation of 3D).
• Grid/Snap can be set to isometric to align cursor behavior.
• Other toggles (OSNAP, ORTHO) are helpful but optional depending on workflow.

Concept / Approach:
Setting the grid (and snap) to isometric reorients the crosshair and snap increments to match the left, right, and top isoplanes. This facilitates drawing edges at correct orientations and simplifies subsequent use of the Ellipse–Isocircle option for circular features. Layers, OSNAP, and ORTHO are secondary considerations and vary per user preference; the critical first step is enabling isometric behavior in the grid/snap system.

Step-by-Step Solution:

Verification / Alternative check:
With isometric grid active, cursor axes and crosshair align to isometric directions, confirming correct setup before drawing begins.

Why Other Options Are Wrong:

• Defpoints layer: a plotting convention, not required for isometric setup.
• Turning OSNAP/ORTHO off: may hurt accuracy; neither is a prerequisite for isometric mode.
• UCS 3D orbit: unrelated to 2D isometric drafting aids.

Common Pitfalls:

• Starting to draw isometrics without activating isometric snap/grid leads to incorrect angles and awkward construction.

Final Answer:
set the grid to isometric