Ev-technologyConceptBeginner · 3 min read

G02 Circular Interpolation Clockwise in CNC Programming Explained

G02 is a CNC programming command that tells the machine to move the tool in a clockwise circular path between two points. It uses parameters to define the arc's center or radius, allowing precise curved cuts in metal or other materials.

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How It Works

Imagine you want to draw a circle or an arc on paper using a compass. In CNC programming, G02 works like that compass but for the machine tool. It moves the cutting tool along a curved path in a clockwise direction from the current position to a target point.

The command needs extra information to know the arc's size and shape. This can be the center point of the circle relative to the start point (using I and J values for X and Y offsets) or the radius of the arc (using R). The machine then calculates the smooth curve and moves the tool accordingly.

This method is useful because it lets the CNC machine cut precise round shapes without manually programming many small straight lines.

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Example

This example shows a simple G02 command to cut a clockwise arc from the current position to a new point with a specified center offset.

gcode

G90 ; Absolute positioning
G00 X10 Y10 ; Move to start point
G02 X20 Y10 I5 J0 ; Cut clockwise arc to X20 Y10 with center 5 units right of start

Output

The tool moves from (10,10) to (20,10) following a clockwise arc with center at (15,10).

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When to Use

Use G02 when you need the CNC machine to cut or move along a clockwise curved path. This is common in machining round features like holes, arcs, or circular pockets.

For example, when making a circular groove on a metal part or rounding the edges of a piece, G02 helps create smooth curves efficiently. It reduces programming complexity compared to approximating curves with many straight lines.

It is paired with G03, which does the same but counterclockwise.

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Key Points

G02 commands clockwise circular movement.
Requires start point, end point, and center or radius info.
Uses I, J for center offsets or R for radius.
Common for cutting arcs, circles, and rounded shapes.
Complemented by G03 for counterclockwise arcs.

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Key Takeaways

G02 moves the CNC tool in a clockwise arc between two points.

It needs center offsets (I, J) or radius (R) to define the arc.

Use G02 to cut smooth circular shapes efficiently.

G03 is the counterclockwise equivalent of G02.

This command simplifies programming curved tool paths compared to many straight lines.