CNC gantry milling machine Known as a gantry milling machine, it is a type of milling machine equipped with a portal‑style frame and a long horizontal bed. On a gantry milling machine, multiple milling cutters can simultaneously machine surfaces, delivering relatively high machining accuracy and production efficiency, making it well suited for machining flat and inclined surfaces on large workpieces in batch and mass production. CNC gantry milling machines can also process spatial surfaces and certain specialized components. The gantry milling machine’s configuration resembles that of a planer; however, instead of a planer mounted on the beam and columns, it features a milling spindle. Moreover, the reciprocating motion of the gantry’s longitudinal table is not the primary cutting motion but rather the feed motion, while the rotary motion of the milling cutter constitutes the main cutting action.

　　What is the structure of a CNC gantry milling machine?

　　 CNC gantry milling machine It consists of a portal frame, a bed table, and an electrical control system.

　　The portal frame consists of columns and a top beam, with intermediate beams. The transverse beam can move vertically along the tracks of the two supporting columns. The main beam is equipped with one or two milling heads featuring vertical spindles, which can travel horizontally along the beam’s track. Each column can mount a milling head; each column has a horizontal spindle that moves up and down along its column guide. These milling heads can simultaneously machine multiple surfaces. Each milling head is fitted with its own electric motor (up to 150 kW), a speed‑changing mechanism, an operating control system, and spindle components.

　　The horizontal long-bed machine is equipped with a movable worktable and is enclosed by a protective guard. During machining, the workpiece is mounted on the worktable and fed longitudinally as required.

　　Gantry milling machines come in various configurations, making them suitable for different workpiece types.

　　Gantry boring and milling machine: The beam is equipped with a milling‑capable boring head.

　　The spindle (sleeve or shoe) can serve as an axial positioning and fine‑adjustment mechanism, with the adjustment speed reducible to 5 mm/min. You can perform boring and milling operations.

　　Gantry drilling and milling machine: The beam is equipped with a power head, allowing the attachment of drill bits or milling cutters to perform drilling and milling operations.

　　The gantry milling machine’s bed is equipped with an X‑axis guideway, and the machine table is mounted on this bed. A movable crossbeam spans the gantry, which comprises a gantry carriage that is movably secured to the X‑axis guideway, as well as a Z‑axis guideway mounted on the gantry. The beam carries a Z‑axis carriage, which is fixed to the Z‑axis guideway via the carriage, and it also incorporates a Y‑axis guideway. The milling unit of the gantry milling machine is mounted movably on the Y‑axis guideway, enabling the gantry to perform three‑axis spatial milling in the X, Y, and Z directions under the control of a numerical control system. This CNC gantry milling machine performs high‑precision operations such as milling, drilling, boring, and cutting.

　　 CNC gantry milling machine What are the main parameters?

　　The primary parameter of a gantry milling machine is the table width; some models, however, use the gantry width as their defining dimension.

　　The SK2015-3 model CNC gantry milling machine can process workpieces with a gantry width of 1.5 meters and a table length of 3 meters—i.e., workpieces measuring 1.5 meters in width and 3 meters in length.