Core Requirements

CNC gantry milling machines (used for aerospace structural parts and large mold machining) demand drive systems that balance high precision, heavy-load rigidity, and dynamic stability:

• Ultra-low backlash: To match the machine’s positioning accuracy requirements (≤0.02mm/1000mm per GB/T33150-2016 standard), planetary gearboxes need backlash ≤ 1 arcmin—critical for avoiding contour errors in curved surface machining .
• High torsional rigidity: Must withstand cutting forces (up to 50kN in heavy milling) without deflection; rigidity ≥800 N·m/arcmin ensures stable material removal .
• Dynamic responsiveness: Supports fast feed rates (up to 30m/min for X/Y axes) and smooth acceleration to prevent vibration-induced surface defects .
• Thermal stability: Minimal heat generation to avoid thermal expansion-related precision drift during 24/7 operation .

Application Scenario

DYMAZEE GANTRY-Series planetary gearboxes are integrated into the X-axis (worktable) and Z-axis (spindle ram) of a 40m travel CNC gantry mill (model: GMF4020), used for machining aluminum alloy aircraft wing spars .

Key performance alignment with real-world machining needs:

• Precision matching: The gearboxes (model: GANTRY-110) feature backlash ≤1 arcmin (ground helical gears, ISO 5 grade) and transmission error ≤25 arcsec. Paired with 22kW servo motors and pre-stretched ball screws, they enable the X-axis to achieve positioning accuracy of 0.015mm/1000mm and repeatability of 0.008mm—meeting aerospace part tolerance requirements (±0.01mm) .
• Heavy-load capability: With rated torque of 850Nm (peak 1700Nm) and torsional rigidity of 1200 N·m/arcmin, the Z-axis gearboxes handle 25kN cutting forces during titanium alloy milling without deflection. This eliminates "chatter marks" on workpiece surfaces, maintaining Ra 0.8μm surface roughness .
• Field reliability: In an aerospace component factory, 8 such gantry mills ran 20-hour shifts for 18 months. The gearboxes (sealed with IP65 protection) showed no lubricant leakage, and gear wear was <0.02mm—consistent with the 10,000-hour maintenance interval typical for precision planetary drives .

Technical Advantages

• Micron-level precision: Adopts double-precision planetary gears with tooth flank grinding, reducing backlash to ≤1 arcmin .
• Rigid compact design: 1-stage planetary structure achieves 10:1 reduction ratio in an 110mm-diameter housing; integrated cross-roller bearings enhance tilting moment resistance by 40% .
• Thermal & durable performance: Heat-dissipating aluminum alloy housing controls temperature rise to <40°C during continuous operation; gears hardened to 62 HRC resist wear even under abrasive coolant exposure .
• Efficient power transfer: Transmission efficiency ≥96%, reducing motor energy consumption by 12% compared to worm gear reducers—critical for large-travel axes with long runtime .