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[Marlin] G002-G003 - Arc or Circle Move
G2adds a clockwise arc move to the planner;
G3adds a counter-clockwise arc. An arc move starts at the current position and ends at the given XYZ, pivoting around a center-point offset given by
This command has two forms:
Ispecifies an X offset.
Jspecifies a Y offset.
- At least one of the
Jparameters is required.
Ycan be omitted to do a complete circle.
- The given
Yis not error-checked.The arc ends based on the angle of the destination.
Rwill throw an error.
Rspecifies the radius.
- Omitting both
Ywill throw an error.
Ymust differ from the current XY position.
Jwill throw an error.
Arc moves actually generate several short straight-line moves, the length of which are determined by the configuration option
MM_PER_ARC_SEGMENT(default 1mm). Any change in the Z position is linearly interpolated over the whole arc.
'ARC_P_CIRCLES' enables the use of the 'P' parameter to specify complete circles
[E<pos>]The amount to extrude between the start point and end point
I<offset>An offset from the current X position to use as the arc center
J<offset>An offset from the current Y position to use as the arc center
[P<rate>]Specify complete circles - requires
R<radius>A radius from the current XY position to use as the arc center
[X<pos>]A coordinate on the X axis
[Y<pos>]A coordinate on the Y axis
[Z<pos>]A coordinate on the Z axis
This illustrates a counter clockwise arc, starting at [9, 6]. It can be generated either by
G3 X2 Y7 I-4 J-3or
G3 X2 Y7 R5
Move in a clockwise arc from the current position to [125, 32] with the center offset from the current position by (10.5, 10.5).
G2 X125 Y32 I10.5 J10.5
Move in a counter-clockwise arc from the current position to [125, 32] with the center offset from the current position by (10.5, 10.5).
G3 X125 Y32 I10.5 J10.5
Move in a complete clockwise circle with the center offset from the current position by [20, 20].
code: G2 I20 J20