G code: G15, G16, G17, G18, G19
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G code |
Description |
|
G15 |
Switches to 2D mode. Valid for all other elements. |
|
G16 |
Activates the 3D plane function in the normal plane with normal vector I/J/K and switches to 3D mode. Valid for all other elements. |
|
G17 |
Activates the 3D plane function in the xy-plane and switches to 3D mode. Valid for all other elements. |
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G18 |
Activates the 3D plane function in the xz-plane. Switches to 3D mode. Valid for all other elements. |
|
G19 |
Activates the 3D plane function in the yz-plane. Switches to 3D mode. Valid for all other elements. |
Three-dimensional path elements are used in 3D mode. In 3D space, you can set points and connect with 3D splines. You can also insert arcs in any spatial plane. In contrast to 2.5D path elements that use xy-coordinates only, the path velocity and acceleration refers to movement in the xyz-coordinates. The y-axis is treated the same as the x-axis and y-axis. Therefore, every movement can be implemented in the z-direction.
3D mode
This mode does not support ellipses, parabolas, and 2D splines. An error message is issued.
SMC_CheckVelocities checks the z-component
SMC_ToolCorr and SMC_AvoidLoop generate errors
Primary differences between 2.5D and 3D
Velocity and acceleration (F/E):
In 3D: Defines the velocity and acceleration of the path.
In 2.5D: Defines the velocity and acceleration of the projection of the path on the xy-plane.
Splines
3D: With a jerk-free, smoothed z-component (G10)
2.5D: In z-direction not smoothed (G5)
Arc
3D: Can be defined in every possible plane in space (G2/G3 with G16/G17/G18/G19)
2.5D: Restricted to the xy-plane (G2/G3)
Example
Velocity comparison of 3D and 2.5D
N0 G1 X1 Z100 F1
3D requires the motion for approximately 100 seconds, because the length of the object contains the z-component.
Length = (12 + 1002)1/2
At a velocity of 1, approximately 100 seconds are required. The velocity of the z-component is approximately 1.
In 2.5D, the motion requires approximately 1 second for the calculation or the length = 1. The velocity in the z-direction is approximately 100.
See also
