When positioning axes in a CNC system, which coordinate set remains constant regardless of movement commands?

When positioning axes in a CNC system, which coordinate set remains constant regardless of movement commands?

• A. Incremental coordinates
• B. Absolute coordinates
• C. Polar coordinates
• D. Relative coordinates

Answer: (B)

Absolute coordinates are anchored to the machine’s fixed origin in the work coordinate system, so they stay as a constant reference even as you issue different movement commands. When you program a move using absolute coordinates, you’re directing the tool to a specific point on that fixed grid, regardless of where the tool is currently located. In contrast, incremental or relative coordinates describe shifts from the current position, so their values change with each move. Polar coordinates describe position in radius and angle rather than a fixed X/Y grid, which isn’t the standard fixed-reference approach used for consistent positioning. So the set that remains constant as commands are issued is the absolute coordinates.

Absolute coordinates are anchored to the machine’s fixed origin in the work coordinate system, so they stay as a constant reference even as you issue different movement commands. When you program a move using absolute coordinates, you’re directing the tool to a specific point on that fixed grid, regardless of where the tool is currently located. In contrast, incremental or relative coordinates describe shifts from the current position, so their values change with each move. Polar coordinates describe position in radius and angle rather than a fixed X/Y grid, which isn’t the standard fixed-reference approach used for consistent positioning. So the set that remains constant as commands are issued is the absolute coordinates.