CGK-401 / CGK-402 / CGK-404 CNC High-Precision Screw Whirlwind Milling Machine
Mill Long Precision Threads in One Setup
The CGK-401/402/404 series uses internal whirlwind milling to produce high-accuracy worms, screws and nuts up to 6 metres long.
The CGK-401 / CGK-402 / CGK-404 is a family of CNC high-precision screw whirlwind milling machines for worms, lead screws, ball screws and nuts. An internal whirlwind milling head cuts the thread while the workpiece rotates slowly, making it possible to machine long threaded parts up to 6 m in a single setup. The machines are controlled by an industrial CNC system with full closed-loop feedback from precision linear scales and a rotary encoder, and the operator interface uses a menu-driven conversational layout. Three bed lengths cover the most common production ranges: CGK-401 at 6000 mm, CGK-402 at 3000 mm and CGK-404 at 4000 mm. The control supports single-stroke and fully automatic cyclic milling, multi-start threads from 1 to 24 starts, dynamic tool setting, pitch compensation and mid-diameter taper compensation.
Request a Quote →Key Features & Working Principle
Internal whirlwind milling plus full closed-loop control turns long threaded parts efficiently and accurately.
Internal Whirlwind Milling
A rotating milling head cuts the thread in an internal whirlwind configuration, letting long screws and worms be machined without multiple setups.
Three Bed Lengths
CGK-401 handles parts up to 6000 mm, CGK-402 up to 3000 mm and CGK-404 up to 4000 mm, matching different production mix requirements.
Full Closed-Loop CNC Control
Precision linear scales on linear axes and a rotary encoder on the work spindle feed back to the CNC for stable, drift-free positioning.
Single-Stroke & Automatic Cyclic Milling
Choose single-pass cycles for setup and proving, or full automatic cyclic milling for unattended production runs.
Multi-Start Thread Milling
The control programs 1 to 24 thread starts without manual indexing, improving productivity on multi-start worms and lead screws.
Intelligent Compensation
Dynamic tool setting, pitch compensation and mid-diameter taper compensation keep thread geometry consistent across the full part length.
Why Choose the CGK-401 / CGK-402 / CGK-404
Whirlwind milling beats conventional thread cutting on long parts because it machines the full helix in one continuous pass.
Long-Part Capability
With bed lengths up to 6000 mm, the series can finish long lead screws and worms that would otherwise require multiple operations.
High Profile Accuracy
Profile error within a 2π arc is held to 0.007–0.008 mm, and cumulative error over any 300 mm span is within 0.016–0.023 mm.
Wide Diameter Range
Milling diameters from Φ16 mm to Φ120 mm cover small precision screws up to large power-transmission worms.
±20° Helix Angle
A maximum helix angle of ±20° handles both shallow-pitch lead screws and steeper worm profiles in the same machine.
Multi-Start Productivity
Programmable 1–24 starts eliminate the manual indexing and rechucking steps normally required for multi-start threads.
Grinding-Alternative Finish
Thread surface roughness of Ra≤0.4 μm lets whirlwind milling replace grinding on many hardened and unhardened screw applications.
CGK-401 / CGK-402 / CGK-404 — Technical Data
Main technical performance indicators from the factory datasheet.
| Parameter | Unit | CGK-401 | CGK-402 | CGK-404 |
|---|---|---|---|---|
| Model | — | Screw whirlwind mill | Screw whirlwind mill | Screw whirlwind mill |
| Max mounting diameter | mm | Φ160 | Φ160 | Φ160 |
| Max machining length | mm | 6000 | 3000 | 4000 |
| Max milling diameter | mm | Φ120 | Φ80 | Φ120 |
| Min milling diameter | mm | Φ20 | Φ16 | Φ20 |
| Workpiece speed | rpm | 0–20 | 0–20 | 0–20 |
| Whirlwind milling head speed | rpm | 500–2000 | 500–2000 | 500–2000 |
| X-axis travel | mm | +100 / −30 | +100 / −30 | +100 / −30 |
| Helix angle | — | ±20° | ±20° | ±20° |
| Millable thread starts | — | 1–24 | 1–24 | 1–24 |
| Profile accuracy within 2π arc | mm | ≤0.008 | ≤0.007 | ≤0.008 |
| Cumulative accuracy over 300 mm | mm | ≤0.023 | ≤0.016 | ≤0.023 |
| Thread surface roughness | μm | Ra≤0.4 | Ra≤0.4 | Ra≤0.4 |
Applications
Designed for manufacturers of worms, screws, nuts and precision threaded components across multiple industries.
Frequently Asked Questions
What parts are best suited to whirlwind milling?
What length options are available?
What is the difference between CGK-401, CGK-402 and CGK-404?
How does the machine maintain accuracy over long parts?
Can it machine multi-start threads?
What information is needed for a quotation?
Configure a CGK-401 / CGK-402 / CGK-404 Whirlwind Milling Machine
Send us your part diameter and length, thread form and pitch, number of starts, helix angle, accuracy class, surface-finish requirement, material and annual volume. Our engineering team will recommend CGK-401, CGK-402 or CGK-404 and prepare a quotation.
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