FANUC, Mitsubishi and Brother
Common control families can be supported after the exact CNC model, available interface and machine configuration are confirmed.
Indexed rotary-axis retrofit solution
External 4th & 5th Axis Retrofit for 3-Axis CNC Machines
Add indexed rotary machining to supported FANUC, Mitsubishi and Brother CNC machines. On compatible TCP/IP integrations, operators can use the machine's original handwheel instead of a separate MPG. A complete project typically costs about 40%-50% of an OEM axis upgrade, depending on the machine and scope.
Original CNC handwheel control
On supported TCP/IP integrations, the rotary axis can be jogged from the machine's built-in handwheel without an extra MPG or pendant.
Typically 40%-50% of OEM cost
A matched external-axis package can reduce total investment substantially compared with an OEM additional-axis package.
Application boundary
When this retrofit is the right approach
External control is primarily intended for indexed positioning, multi-face machining and repeatable angular moves. The required motion determines whether external or native CNC integration is appropriate.
A strong fit for indexed machining
- The existing 3-axis machine is mechanically reliable.
- Workpieces require side drilling, radial features or multi-face milling.
- Fixed-angle indexing is sufficient for the machining process.
- An OEM additional-axis package is too expensive or unavailable.
- The machine has sufficient table load, travel, spindle clearance and cabinet space.
Needs a native-axis architecture review
- Continuous simultaneous X/Y/Z/A or full 5-axis interpolation is required.
- The process depends on high-speed contouring across multiple axes.
- OEM-specific safety, collision avoidance or advanced kinematics are mandatory.
- The machine has no suitable signal, communication or cabinet interface.
- The rotary unit and workpiece exceed the available load or working envelope.
Investment and capability
OEM axis expansion vs external indexed-axis retrofit
The lower-cost route is valuable only when it matches the required motion. This comparison helps define the correct starting point.
Decision point
OEM axis expansion
Yidai external retrofit
Typical investment
Higher machine-brand hardware, software and service cost.
A complete project is typically about 40%-50% of OEM upgrade cost, depending on scope.
Motion capability
Best route when full simultaneous interpolation and native kinematics are required.
Designed primarily for indexed positioning, fixed-angle moves and multi-face machining.
Integration
Depends on the original CNC builder's servo architecture and service support.
Matched rotary table, controller, servo drive and communication method are selected for the machine.
Handwheel operation
Normally integrated through the native CNC additional-axis function.
The original CNC handwheel can be used on supported TCP/IP integrations; other methods may use a separate interface.
Best use
Advanced simultaneous contouring and machine-builder-specific functionality.
Cost-conscious upgrades for indexed drilling, milling, positioning and repeatable multi-side work.
Communication options
How the CNC and rotary controller work together
The exact method is selected from the CNC control model, available interfaces, program workflow and operator requirements.
Best route for original handwheel operation
On supported CNC configurations, network communication can coordinate command and status data and allow the machine's built-in handwheel to jog the rotary axis. Compatibility must be checked by exact control model.
Serial command or position transfer
RS232 can be practical on controls with suitable serial functions. The operating sequence and available feedback depend on the CNC, and a separate controller interface may still be used.
Simple, robust indexed positioning
The CNC sends start or position-selection signals and receives completion or alarm status. Rotary positions are managed by the external controller; this method is not continuous interpolation.
System architecture
A matched retrofit package from command to motion
Selection covers the mechanical rotary unit and the complete control path, not just a single product.
CNC control
TCP/IP, RS232 or I/O
External axis controller
Servo drive and motor
4th or 5th axis rotary table
Indexed machining workflow
How a typical cycle operates
The host CNC remains responsible for the original X, Y and Z machining cycle while the external system manages rotary positioning.
Machining stops safely
The program reaches the rotary-positioning point and confirms the spindle or cutting motion is safe.
CNC sends a command
The control uses TCP/IP, RS232 or an I/O/M-code signal according to the selected integration.
Rotary axis indexes
The external controller commands the servo and positions the rotary table at the required angle.
Position is confirmed
The external system completes positioning, applies the brake if required and returns ready status.
Machining continues
The host CNC resumes the X/Y/Z program for the next indexed face or feature.
Real installation evidence
Machine-side and cabinet-side implementation
The rotary unit works inside the machining enclosure. The external controller and servo hardware are installed separately in the electrical cabinet.
Before selection
Send the information that determines compatibility
A model number alone is not enough. These details allow the rotary table, controller method, servo size and installation approach to be evaluated together.
Machine and CNC model
Machine builder, exact machine model and complete CNC control model.
Working envelope
Machine table size, X/Y/Z travel, spindle clearance and allowable table load.
Workpiece details
Dimensions, weight, center of gravity, clamping method and required orientations.
Machining process
Indexed positions, features to be machined, cycle sequence and accuracy requirements.
Interface and cabinet
Available TCP/IP, RS232 or I/O signals plus clear photos of the electrical cabinet.
Operator requirement
Confirm whether original CNC handwheel operation is required for the rotary axis.
Products and technical resources
Continue your retrofit evaluation
Compare rotary-table formats, controller options and control-brand requirements before requesting a final recommendation.
4th Axis CNC Rotary Tables
Single-axis rotary tables for indexed drilling, milling and multi-face machining.
5th Axis Rotary Tables
Tilting rotary tables for indexed multi-angle positioning and complex workpiece access.
External Rotary Axis Controllers
Controller options for matched external 4th or 5th axis retrofit systems.
Rotary Table Size Guide
Evaluate workpiece envelope, machine travel, center height, brake, bore and load.
CNC Compatibility Guide
FANUC, Mitsubishi and Brother control checks for communication and cabinet integration.
RS232 vs I/O Guide
Understand indexed-axis triggering methods and their operating differences.
Frequently asked questions
External CNC axis retrofit FAQ
Does the solution support FANUC, Mitsubishi and Brother CNC controls?
These control families are commonly supported, but compatibility is not determined by the brand name alone. We need the exact CNC model, available TCP/IP, RS232 or I/O interface, machine configuration and required operating sequence before confirming a solution.
Can the rotary axis use the machine's original handwheel?
Yes, on supported TCP/IP integrations the rotary axis can be jogged from the CNC's built-in handwheel without adding a separate MPG. This function depends on the exact CNC control and communication implementation, so it must be confirmed for each machine.
Is this a simultaneous 4-axis or 5-axis system?
The external solution is primarily designed for indexed positioning and multi-face machining. Projects requiring full simultaneous interpolation, advanced kinematics or high-speed multi-axis contouring need a separate review of the CNC and native servo architecture.
How much does an external retrofit cost compared with an OEM upgrade?
A complete external-axis project typically costs about 40%-50% of an OEM additional-axis upgrade. The actual ratio depends on rotary-table size, servo power, control method, brake system, wiring, installation scope and the target machine.
What information is required for a recommendation?
Send the machine make and model, exact CNC control model, table and travel dimensions, workpiece size and weight, machining process, required indexing angles, cabinet photos and available communication interfaces.
Start with your CNC model and workpiece
We will review the machine envelope, CNC interface, handwheel requirement, rotary-table size and control method before recommending a package.