Circular Interpolation (G02/G03)

Definition

Moves along an arc path. Arc moves depend on plane selection, direction, endpoint, and center definition.

Formula / Rule

• G02 commands clockwise arcs and G03 commands counterclockwise arcs in the active plane.
• Program arcs with end coordinates plus I, J, or K center offsets, or use R only when the controller rule is confirmed.

Typical Range

• Use it for bores, radii, helical lead-ins, and contour blends where arc accuracy matters.

Shop-floor Scenarios

• Dry-run the first arc after post changes to confirm plane and center convention.
• Check quadrant transitions and lead-in clearance before releasing production code.

Common Errors / Troubleshooting

• If the controller alarms on arcs, confirm plane, endpoint geometry, and I/J/K sign.
• If the toolpath gouges, compare CAM output with machine dialect rules for R versus I/J/K.

Related Tools

• G-code Reference
• G-code Viewer