9 Circular Interpolation

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Circular interpolation
CIRCULAR PROFILES
• Circular cutting motion
• Arc or Radius Cutting is known as Circular interpolation
• Milling machine operations involve circular motion
for determining tool movement in the clockwise
direction as well as the counterclockwise direction.
• Circular interpolation is carried out with
Go2 or G03 code
• Circular interpolation can be programed using
radius (R ) value or (I J K) value
Circular interpolation using Radius
• General format for G02 or G03
•
X Y R
•G02 X8.25 Y 4.25 R 1.5
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Go2 means that it will be clockwise circular cut
X value 8.25
Y value is 4.25
R value is 1.5 is the length of radius
Tool Motion
• Plane Selection:
• G17 XY plane
• G 18 XZ plane
• G19 YZ plane
PROGRAMING CIRCULAR MOVE
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The general format is: G02 X8.25 Y 4.25 R 1.5
EXAMPLE
G17 G90
G2 X 2.125 Y 0.75 R5 F2
PROFILING AT CONSTANT FEED RATE
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To maintain constant feed rate while profiling a contour:
Distance traveled at the center of the tool
Feed rate of the tool center:
linear motion
In circular motion
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Page:199
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EXAMPLE
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G17 G91
 G2 X 4.125 Y 2.125 R - 5 F2
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PROGRAM
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Heading of Program
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Plane Selection
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Tool Selection
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The system in in proper motion mode(G90, G91)
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The control in linear interpolation mode (G0 G1)
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Feed rate and speed has been specified (F,S)
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Circular Interpolation Direction ( G02 , G03)
Circular Interpolation

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