SG401 High-Precision CNC Ball Screw Whirling Machine

Overview

The SG401 CNC Whirling Machine is our flagship solution for extra-long workpieces, supporting a massive machining length of up to 6000mm. Engineered to handle the unique challenges of long-stroke transmission—such as vibration and deflection—it ensures consistent Grade P5 accuracy across the entire span. This model is the premier choice for manufacturing core components for heavy-duty gantry milling machines and large-scale aerospace actuators.

This CNC Ball Screw Whirling Machine is engineered with a rear-mounted vertical guideway, significantly enhancing machining rigidity while optimizing chip evacuation. The machine features a fully enclosed structure with stainless steel telescopic covers, ensuring durability and a clean workspace. All hydraulic, pneumatic, and electrical lines are systematically routed for a streamlined and industrial-grade layout.

 

Drive & Closed-Loop Control System

The core whirling motion relies on the synchronized interpolation of the C-axis (spindle rotation) and Z-axis (linear feed) to generate precise spiral trajectories.

• C-Axis: Driven by a servo motor through a planetary reducer and dual-stage anti-backlash gears, combined with a high-precision rotary encoder for full closed-loop control.
• X & Z Axes: Both axes utilize precision linear scales (mounted away from the operator on the Z-axis) coupled with servo motors to establish a complete closed-loop system, guaranteeing exact positioning and radial feed accuracy.
• Compensation: The CNC software includes advanced base-length pitch compensation and diameter compensation functions to eliminate machining deviations.

Clamping & Auxiliary Support

Designed for high-precision long shaft milling, the clamping and support mechanisms are highly dynamic:

• Hydraulic Collets: Secures the workpiece efficiently, compatible with collet specifications ranging from 16, 20, 25, 32, 40, 50, 63, 80, to 100.
• Auto-Centering Servo Clamps: Positioned on both sides of the whirling mechanism, these clamps adjust clamping force via servo motor current, maximizing rigidity near the cutting head.
• Dynamic Auxiliary Support: Utilizes two sets of servo-driven cylinders that automatically retract when the carriage approaches and re-engage once it passes. An integrated air-blow system clears chips from the supports to prevent surface damage.

Whirling Head & Milling Process

The whirling head is powered by a variable-frequency motor via belt reduction, with speeds precisely controlled by the system program. The helix angle is automatically adjusted via a servo motor and reducer. The machine allows for a minimum distance of ≤260mm from the headstock chuck to the cutting center, and ≤200mm from the cutting center to the rear clamp, maximizing material utilization by enabling full-length continuous milling before segmentation. An integrated chain-plate chip conveyor efficiently transports machined chips to the collection box.