Red Seal Machinist Practice Exam

In CNC machining, what does the term “gantry” refer to?

1. A motorized bed for moving workpieces

2. A structure supporting the tool that moves over the workpiece in multiple axes

3. A component that holds the workpiece in place

4. A cooling system for the cutting tool

The correct answer is: A structure supporting the tool that moves over the workpiece in multiple axes

In CNC machining, the term "gantry" refers to a structural component that supports the tool and moves over the workpiece in multiple axes. A gantry system typically consists of an overhead frame that spans the work area and carries the cutting tool or spindle. This design allows for precise control of the tool's movement in various directions, which is essential for achieving the desired accuracy and finish on the workpiece. The gantry structure enables machining operations to be performed on larger parts, as it can accommodate a wide range of materials and sizes. By maintaining stability and reducing vibrations during operation, the gantry design contributes to improved machining quality. The other options describe different aspects of CNC machining: the motorized bed is associated with the movement of the workpiece; a component that holds the workpiece refers to fixtures or clamps; and a cooling system typically involves coolant application to the cutting tool to maintain its temperature during operation. While relevant to CNC machining, these elements do not embody the definition of a gantry.