Circular Interpolation Motion

Classic Control - Lathe Operator's Manual

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G02 and G03 are the G-codes for circular cutting motions. Circular Interpolation Motion has several optional address codes to define the arc or circle. The arc or circle begins cutting from the current cutter position [1] to the geometry specified within the G02/ G03 command.

Arcs can be defined using two different methods. The preferred method is to define the center of the arc or circle with I, J and/or K and to define the end point [3] of the arc with an X, Y and/or Z. The I J K values define the relative X Y Z distances from the starting point [2] to the center of the circle. The X Y Z values define the absolute X Y Z distances from the starting point to the end point of the arc within the current coordinate system. This is also the only method to cut a circle. Defining only the I J K values and not defining the end point X Y Z values will cut a circle.

The other method to cut an arc is to define the X Y Z values for the end point and to define the radius of the circle with an R value.

Below are examples of using the two different methods to cut a 2" (or 2 mm) radius, 180 degree, counter-clockwise arc. The tool starts at X0 Y0 [1], moves to the starting point of the arc [2], and cuts the arc to the end point [3]:

Arc Cutting Example

Method 1:

% T01 M06 ; ... G00 X4. Y2. ; G01 F20.0 Z-0.1 ; G03 F20.0 I-2.0 J0. X0. Y2. ; ... M30 ; %

Method 2:

% T01 M06 ; ... G00 X4. Y2. ; G01 F20.0 Z-0.1 ; G03 F20.0 X0. Y2. R2. ; ...M30 ; %

Below is an example of how to cut a 2" (or 2 mm) radius circle:

% T01 M06 ; ... G00 X4. Y2. ; G01 F20.0 Z-0.1 ; G02 F20.0 I2.0 J0. ; ... M30 ; %

Be aware: Many service and repair procedures should be done only by authorized personnel. The service technicians at your Haas Factory Outlet (HFO) have the training, experience, and are certified to do these tasks safely and correctly. You should not do machine repair or service procedures unless you are qualified and knowledgeable about the processes.

Danger: Some service procedures can be dangerous or life-threatening. DO NOT attempt a procedure that you do not completely understand. Contact your Haas Factory Outlet (HFO) and schedule a service technician visit if you have any doubts about doing a procedure.

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