Need Help! Feedrate calculation: length of Arc in 4 axis operation

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Thread: Feedrate calculation: length of Arc in 4 axis operation

  1. #1
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    Default Feedrate calculation: length of Arc in 4 axis operation

    Does anyone have a formula to calculate the length of the arc described by a movement of a single G1 command involving the X, Y, Z and A axis?
    I'd like to compensate the Feedrate to keep a constant speed on the surface of the milled object (with a maximum Feedrate in case the tip of the tool doesn't move è. G. While moving around a sharp corner)


    This is for
    https://code.google.com/p/simplemultiaxiscam
    My simply 4 axis CAM program.

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  2. #2
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    Thinking about it...
    A G1 command lists linear and rotational axes.
    For only linear axes the speed given be the F parameters is the speed of all 3 axis combined in mm/min.
    For only a rotational axis the speed is interpreted as degrees/min (thus the actual linear speed depends on the radius)

    How do you actually set the speed of a G1 command that involves linear and rotational axes in one move and what is the unit?
    What about a movement that rotates a tool using it's tip as the center of rotation(no linear movement despite all lines axes moving) .



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Feedrate calculation: length of Arc in 4 axis operation

Feedrate calculation: length of Arc in 4 axis operation