Which milling machine uses a horizontal arbor to mount the cutters?

• A. Vertical mill
• B. Router
• C. Horizontal mill
• D. CNC machine

Answer: (C)

This question focuses on how cutters are held in milling machines. A horizontal milling machine uses a horizontal spindle with an arbor, a shaft that runs across the table on which multiple cutters can be mounted in line. This Arbor-based setup is characteristic of horizontal mills, allowing side-and-face cutters and longer cutting assemblies. In contrast, a vertical mill has the spindle oriented vertically and typically holds a single cutter directly in the spindle rather than on a horizontal arbor. A router is a woodworking tool and isn’t configured with a horizontal arbor for milling metal, and a CNC machine refers to computer-controlled operation and can be configured in either orientation—but the specific description of a horizontal arbor points to a horizontal milling machine.