SPR Linear/Gantry Mills are three-axis, portable milling machines used for precision milling of critical mounting surfaces. These mills are designed with ball screws and rails on all three axis, X-Y-Z, for precise backlash-free motion. Multiple spindle positions allow for a greater range of milling adjustments whether it is horizontal, vertical and/or angular (90°). This allows the machine to produce CNC quality work in the most demanding of applications.