07Lecture-G-Code-circular - ENGR3190U Manufacturing and...

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ENGR3190U: Manufacturing and Production Processes Lecture 07 Circular Interpolation , Feeds and Speeds 1. Circular Interpolation (G02, G03) Circular interpolation allows programmer to move cutting tool in a circular path – arc. G02 – cuts arc clockwise G03 – cut arc counter clockwise Two methods to cut arcs: (1) Radius method - R (2) Arc Modifiers - I, J, K R-method (G02 or G03) (End Point: X,Y) (radius: R or R- ) (Feed Rate: F) If cut 0 < arc ≤ 180 o use R, eg. R3.0 If cut 180 < arc ≤ 360 o use R-, eg. R-3.0 Example 1 Write the statement to cut the following arc. Use absolute programming. Start point = X2.0 Y4.0, Centre point = X2.0 Y1.0, End point = X2.0 Y-2.0 N10 G90 G02 Y-2.0 R3.0 F3.0 (not need to repeat X2.0 because it is unchanged) I ,J,K – method If X-Y plane (G17) is selected then use I and J. If Y-Z plane (G19) is selected then use J and K If Z-X plane (G18) is selected then use I and K We use X-Y plane in this course. (G02 or G03) (End Point: X,Y) (Modifiers: I, J) (Feed Rate: F) 1
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I = incremental distance from the start of arc to centre of arc in “X”
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