CNC rotary tables and CNC index tables are both used for controlled workpiece positioning, but their functions and applications can be different.
Understanding the difference between a CNC rotary table and a CNC index table can help you select a suitable solution for your machining center.
The right choice depends on the machining process, positioning requirements, workpiece characteristics and CNC machine configuration.
Start with the Required Machining Motion
First ask whether the rotary axis must move while the tool is cutting. Product names alone do not establish this capability: confirm the individual table, drive and machine-control configuration.
| Your process | What to confirm |
|---|---|
| Rotate, stop and machine each face | Check every required angle, positioning performance and clamping sequence. |
| Rotate while cutting | Confirm coordinated rotary-axis motion with the machine supplier, including drive, controller and programming support. |
| Add both rotation and tilt | Review a tilting setup and confirm whether the application needs 3+2 positioning or simultaneous motion. |
A table with fixed indexing increments must support the angles in your program. For example, a 5° increment does not provide a 7° index position. Check the selected model rather than assuming that all index tables offer the same increments.
For rotary-and-tilting applications, use the 5-axis selection guide. For technical terminology, read the rotary table specifications guide.
What Is a CNC Rotary Table?
A CNC rotary table is a rotary positioning device that allows a workpiece to be rotated around a controlled axis.
Depending on the configuration, it can be used for:
- 4-axis machining
- Multi-sided machining
- Angular positioning
- Continuous rotary movement
- Precision positioning
- Complex machining applications
A rotary table can provide controlled rotary movement in addition to the linear axes of a CNC machining center.
What Is a CNC Index Table?
A CNC index table is designed primarily for controlled angular indexing and positioning.
Instead of manually rotating the workpiece between operations, the CNC index table can position the workpiece at defined angles.
Typical applications include:
- Multi-sided machining
- Drilling on multiple faces
- Milling at defined angles
- Repeated indexing operations
- Precision positioning
- Production machining
The exact functions depend on the specific model and configuration.
CNC Rotary Table vs CNC Index Table
The terms can sometimes overlap because both products provide rotary positioning.
However, the practical difference is often related to how the rotary axis is used.
| Feature | CNC Rotary Table | CNC Index Table |
|---|---|---|
| Main purpose | Rotary positioning and movement | Controlled angular indexing |
| Multi-sided machining | Yes | Yes |
| Angular positioning | Yes | Yes |
| Continuous rotation | Depending on configuration | Depending on configuration |
| 4-axis machining | Common application | Possible depending on configuration |
| Precision indexing | Yes | Yes |
| Workholding integration | Chuck or fixture | Chuck or fixture |
| CNC integration | Depends on configuration | Depends on configuration |
Always check the specifications of the individual model before selecting a product.
When Should You Use a CNC Rotary Table?
A CNC rotary table may be suitable when your machining process requires controlled rotary movement or flexible positioning.
For example, it can be considered for:
4-Axis Machining
A rotary table can provide an additional controlled rotary axis for a machining center.
This can allow the machine to access different surfaces or orientations of a workpiece without repeatedly removing and repositioning it.
Multi-Sided Machining
A rotary table can help position several sides of a workpiece for machining.
This can reduce manual repositioning and help maintain a consistent workholding setup.
Angular Machining
When machining features at different angles, controlled rotary positioning can provide a more flexible setup.
The required accuracy and positioning method depend on the application.
When Should You Use a CNC Index Table?
A CNC index table can be useful when the primary requirement is repeatable angular positioning.
For example:
- Drilling multiple hole patterns
- Machining several faces
- Repeated production operations
- Positioning components at defined angles
- Multi-sided machining
For these applications, indexing capability and repeatability are important specifications to review.
What Is a CNC Dividing Head?
The term CNC dividing head is also commonly used when discussing rotary positioning equipment.
A dividing head traditionally refers to equipment used to divide or position a workpiece at specific angular intervals.
Modern CNC dividing heads and CNC rotary tables can provide more advanced controlled positioning and CNC integration.
Because terminology varies between manufacturers and markets, buyers should focus on the actual specifications and intended application rather than the product name alone.
Key Specifications to Compare
Whether you are considering a CNC rotary table or CNC index table, several specifications should be reviewed.
Table Diameter
The table diameter should be suitable for the workpiece and workholding system.
Load Capacity
Consider the combined weight of the workpiece, chuck, fixture and other components mounted on the rotary table.
Through Hole
The through hole can affect the type of workpieces and workholding arrangements that can be used.
Indexing Accuracy
Indexing accuracy indicates how accurately the table reaches the commanded position.
Repeatability
Repeatability indicates how consistently the rotary table can return to a specified position.
Maximum Speed
Maximum speed should match the machining process and required rotary movement.
Clamping or Braking
The required clamping or braking capability depends on the workpiece, machining forces and application.
CNC Control Compatibility
The rotary table must be compatible with the CNC machine and its control configuration.
How to Choose Between a CNC Rotary Table and CNC Index Table
Start by defining how you need the rotary axis to operate.
Ask these questions:
- Do you need continuous rotary movement?
- Do you mainly need positioning at defined angles?
- Are you performing 4-axis machining?
- How many sides of the workpiece need to be machined?
- What is the workpiece size and weight?
- What type of chuck or fixture will be used?
- What accuracy and repeatability are required?
- What CNC control system does your machine use?
The answers can help narrow down the suitable product configuration.
CNC Rotary Table Selection Checklist
Before requesting a quotation, prepare:
- CNC machine model
- Machine configuration
- Workpiece dimensions
- Workpiece weight
- Required table diameter
- Required through hole
- Required indexing accuracy
- Required repeatability
- Required rotary speed
- Chuck or fixture requirements
- CNC control system
- Required quantity
Providing these details allows a supplier to better understand your application and identify suitable product options.
How ROTIVEX Helps
ROTIVEX provides CNC rotary and workholding solutions for global buyers.
We help buyers compare suitable product options based on machine configuration, workpiece requirements and machining applications.
Our product range includes:
- CNC Rotary Tables
- CNC Index Tables
- CNC 5-Axis Rotary Tables
- Chucks
- Workholding Fixtures
- Accessories
We coordinate product information and quotations with our supply partners so buyers can evaluate suitable solutions for their applications.
Frequently Asked Questions
Is a CNC rotary table the same as a CNC index table?
Not necessarily. The terms can overlap, but a CNC rotary table may support broader rotary positioning functions, while an index table may focus more on defined angular positioning. Always check the individual product specifications.
Can a CNC index table be used for 4-axis machining?
Depending on the model and CNC configuration, an index table may be suitable for 4-axis applications. Confirm the required CNC integration and operating functions before purchase.
Is a CNC dividing head the same as a rotary table?
The terms are sometimes used interchangeably in the market, but product designs and capabilities can differ. Compare the actual specifications and intended application.
How do I choose the correct size?
Consider the workpiece dimensions, weight, chuck or fixture, available machine space and required machining access.
What information is needed for a quotation?
Provide your CNC machine model, workpiece dimensions and weight, application, required accuracy, workholding requirements and CNC control information.
Need Help Choosing?
Not sure whether a CNC rotary table or CNC index table is suitable for your application?
Send us your CNC machine model, workpiece requirements and application details.
ROTIVEX can help identify suitable product options and coordinate available technical information and quotation with our supply partners.
Compare Suitable Product Categories
Review CNC rotary tables for rotary-axis configurations, or CNC index tables for the available MINC and HINC options. Send your required angles, machine/controller model, combined workpiece and fixture weight, and cutting requirements with your quotation request.
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