Enhancing a CNC router with a 4th axis unlocks full rotary engraving, complex curved parts, and multi-angled carving that’s not possible with a traditional 3-axis setup. This guide highlights five top-rated 4th-axis modules designed for hobbyists and professionals alike. Each option supports different diameters, tailstock configurations, and drive systems to fit a range of machines and workflows. Read on to compare features, compatibility, and how these modules integrate with common controller setups to expand your CNC capabilities.
| Product | Brand | Diameter Range / Range | Key Benefit |
|---|---|---|---|
| OUYANG CNC Rotary Axis 4th Axis | OUYANG | 4–60 mm | Versatile mounting + dual connection options |
| Genmitsu 4th Axis Rotary Module | Genmitsu | 2–50 mm (tailstock 10–100 mm / 10–200 mm variants) | High-torque NEMA17 motor, broad compatibility |
| CNCTOPBAOS K11-100mm 4th Axis | CNCTOPBAOS | 2–90 mm (63 mm chuck); 65 mm center height | 3-jaw chuck with MT2 tailstock options |
| WIZMAKER CNC Router Engraving Machine with 4th Axis | WIZMAKER | 2.756 in chuck, 7.874 in length | High-precision four-axis linkage; broad work area |
| CNCTOPBAOS K12-100mm CNC Rotary Axis | CNCTOPBAOS | 2–50 mm / 22 mm bore; 65 mm tailstock | Robust NEMA23 motors; MT2 tailstock |
OUYANG 4th Axis Rotary Axis Module
The OUYANG 4th axis is an upgraded rotary kit designed to retrofit TTC450 and similar CNC routers for full rotary engraving. It accommodates materials from 4 to 60 mm in diameter and offers an adjustable center height for flexible mounting. The module supports two connection modes: direct motor connector or router motherboard interface, enabling compatibility with a range of machines on the market. This versatility makes it suitable for hobbyists expanding from 3-axis to multi-axis engraving.
Genmitsu 4th Axis Rotary Module
The Genmitsu 4th Axis Rotary Module is a drop-in upgrade for 4040-PRO, 4040 Reno, and 3030-PROVer MAX machines, enabling full rotary carving. It uses a NEMA17 planetary geared stepper motor for higher torque and precision. With a center height of 50 mm and a total height of 86 mm, it fits a wide range of workpieces. A key note is that the 4th-axis control requires an offline controller for proper G-code transmission on some machines, so plan to pair the axis kit with the appropriate controller if needed.
CNCTOPBAOS K11-100mm 4th Axis
This CNCTOPBAOS module features a 65 mm MT2 tailstock, a 22 mm hollow shaft, and a 6:1 reduction ratio. It pairs a Nema23 hybrid stepper motor with a robust 4-jaw chuck setup. The kit provides a compact 210x168x115 mm footprint and is designed for precise rotational work on cylindrical components, with a focus on stability and durability in demanding milling and engraving tasks.
WIZMAKER 4th Axis Engraving Module
The Wizmaker 4th Axis Module delivers a belt reduction ratio of 1:4 and supports a chuck range of 0.157–2.480 inches with a maximum workpiece length of 7.480 inches. It enables four-axis linkage when used with Wizmaker’s software ecosystem, achieving engraving precision up to 0.020 inches. Its large working area accommodates a variety of project sizes, making it suitable for professional-grade engraving tasks.
CNCTOPBAOS K12-100mm Rotary Axis
The K12-100mm module from CNCTOPBAOS offers a 65 mm tailstock with a 6:1 belt reduction and a 22 mm hollow shaft. It includes an MT2 tailstock option and a robust 270 oz-in NEMA23 motor, designed to support three-dimensional processing of cylinders, bends, and circles. The assembly emphasizes durability, stability, and compatibility with a range of CNC routers and mills for engraving and precision turning tasks.
Buying Guide: Key Considerations For Selecting A 4th Axis
When choosing a 4th-axis module, consider these criteria to ensure the best fit for your setup:
- Torque and drive type: Higher torque and a reliable gearbox or planetary drive improve accuracy on larger or heavier workpieces. NEMA23 or NEMA17 motors are common; assess if a heavy-duty gearbox or belt drive is needed for your material and target tolerances.
- Tailstock and mounting style: A tailstock helps support long cylindrical pieces. Check center height, overall height, and tailstock travel to ensure compatibility with your machine’s Z-axis travel and bed height.
- Center diameter range: Select a module that accommodates your typical workpiece diameters. Narrow ranges may limit projects, while broader ranges provide more flexibility.
- Control interface: Some modules require offline controllers or specific software packages. Plan for any additional hardware needed to transmit G-code to the 4th axis and synchronize with the 3-axis system.
- Compatibility: Verify the module is compatible with your router’s model, firmware, and mounting footprint. Some kits are designed for particular brands or series; others offer broader compatibility.
- Precision and backlash: Look for low backlash gearboxes and quality coupling to minimize positional drift during multi-axis operations.
- Ease of installation: Consider whether the kit is a plug-and-play upgrade or requires significant machine tuning. Documentation and customer support can reduce setup time.
In practice, the choice depends on your intended work: hobby engraving of small cylindrical parts, or professional-grade machining of larger, complex parts. Modules with robust tailstocks and higher torque are preferable for heavier materials, while lighter, compact modules suit small-scale engraving and display pieces. Always confirm software compatibility and any required offline controllers to ensure seamless integration with your existing CNC ecosystem.