Which term indicates the location of the gage line on a CNC mill?

Which term indicates the location of the gage line on a CNC mill?

• A. Above the flange
• B. Below the table
• C. Within the spindle
• D. On the tool rack

Answer: (A)

The gage line is used as a fixed reference point for measuring tool length and setting up the machine. It needs to be a location that is reliably accessible during setup, free from interference with the table, fixtures, or rotating parts. Placing the gage line above the flange on the spindle nose provides a stable, clear reference that stays in the same plane as the tool tip as you insert tools and establish offsets. Locations like below the table or within the spindle would be blocked or unsafe, and a spot on the tool rack isn’t connected to the machine’s working reference. So the location above the flange best supports consistent measurement and setup.

The gage line is used as a fixed reference point for measuring tool length and setting up the machine. It needs to be a location that is reliably accessible during setup, free from interference with the table, fixtures, or rotating parts. Placing the gage line above the flange on the spindle nose provides a stable, clear reference that stays in the same plane as the tool tip as you insert tools and establish offsets. Locations like below the table or within the spindle would be blocked or unsafe, and a spot on the tool rack isn’t connected to the machine’s working reference. So the location above the flange best supports consistent measurement and setup.