Overview
Gantry (portal) milling machines are large, rigid CNC mills with a bridge-style gantry that spans the work area, ideal for machining big, heavy parts with high precision. They offer long travel, heavy-duty spindles, and robust fixturing options for aerospace, mold, and structural components. Gantry mills are built for stability and accuracy over large footprints and often integrate automation, tool changers, and pallet systems for high-throughput production.
FAQ
What should I inspect when buying a used gantry milling machine?
Check table and spindle condition, axis backlash, linear ways and ballscrews, control and CNC electronics, spindle runout, maintenance records, and test-cut parts. Verify serials, spare parts availability, and whether the machine has been retrofit or relevelled.
How do I plan shipping and transport for a gantry mill?
Determine weight, dimensions, and lifting points; consider partial disassembly (gantry removal, pallet tables) to reduce height. Use specialized heavy-haul carriers, cranes for loading/unloading, and secure the machine to avoid movement or damage.
What site preparations are required before delivery?
Prepare a level, load-rated foundation or grillage, adequate overhead clearance, crane or forklift access, stable power supply, and environmental controls (temperature, dust) per manufacturer specs.
Which maintenance tasks keep a gantry mill accurate?
Regularly check and adjust axis backlash, lubricate linear guides and ballscrews, monitor spindle bearings and coolant, align and level the machine, and perform periodic laser or ballbar tests to verify accuracy.
How do I handle controls, software and spare parts?
Confirm controller model and software versions, obtain backups of CNC parameters, ensure compatibility with your CAM/post-processor, and secure critical spares (encoders, drives, spindle bearings) or service agreements before purchase.
