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Cutter Compensation (G40, G41, G42)
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The use of cutter compensation allows the programmer to use the part geometry exactly as from the print for programmed coordinates. Without using compensation, the programmer must always know the cutter size and offset the programmed coordinates for the geometry by the amount of the radius. In this scenario, if a different size cutter is used the part will not be machined correctly. An added advantage for using cutter compensation is the ability to use any size cutter as long as the offset amount is input accurately into the offset register. It is also very effectively used for fine-tuning of dimensional results by minor adjustments to the amount in the offset register.

• G40 = Cutter Compensation Cancel

• G41 = Cutter Compensation Left

• G42 = Cutter Compensation Right

Cutter Radius Compensation Left

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The tool is positioned on the left hand side of the part, as seen following the direction of movement, from behind the tool.

Cutter Radius Compensation Right

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The tool is positioned on the right hand side of the part, as seen following the direction of movement, from behind the tool.

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