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G61 and G64 - Set Path Control Mode

Details:

G61 - Set Exact Path Control Mode

To put the machining system into exact path mode, program: G61

G64 - Set Blended Path Control Mode

To attempt to maintain the defined feed velocity, program: G64 P~ Q~

Word Definition
P~ If present, specifies the maximum acceptable tool path deviation to round corners to maintain speed. If P is omitted then the speed is maintained however far from the programmed path the tool cuts.
Q~ If present, specifies the maximum deviation from collinearity that will collapse a series of linear G01 moves at the same feed rate into a single linear move.

Note: it is OK to program for the mode that is already active.