Hurco winmax, Руководство по программированию, Страница: 134 / 254

4 - 20 ISNC G Codes
704-0115-307
WinMax Lathe NC Programming
G18 - XZ Plane (default)
G18, the XZ Plane Selection code, is the default and sets the plane for the circular
interpolation modes G02/G03 - Clockwise/Counterclockwise Arc to the XZ plane.
Default—Yes
Modal—Yes
G18 cancels G17 - XY Plane or G19 - YZ Plane.
Format
The format of the XZ plane selection command is as follows:
G18 Z____ X____
• The X, Y, Z, I, and K words are valid in circular interpolation blocks.
• J words are invalid.
• If a Y word is programmed in the circular interpolation block, a helix is
generated in the XZ plane.
• The direction of an arc or helix in the XZ plane can be determined by looking
at the XZ plane with positive X to the right and positive Z going up.
• Basic NC and ISNC handle the XZ plane differently. For Basic NC, the XZ
plane is a left-handed coordinate system (thumb points to positive Y, and
fingers wrap in clockwise direction). For ISNC, the XZ plane is a right-handed
coordinate system (thumb points to positive Y, and fingers wrap in a
counterclockwise direction).
• In G18, the arc end point is defined by the X and Z words in the block. The
arc center point is defined by the I and K words in the block.
Example
The diagram below illustrates XZ plane selection:
Figure 4–9. G18 XZ Plane Selection