The “sub spindle CNC lathe” is a type of advanced CNC (Computer Numerical Control) turning machine commonly used in precision machining.
What Is a Sub Spindle CNC Lathe?
A sub spindle CNC lathe (also known as a double-spindle lathe or swiss-type lathe with sub-spindle) is a CNC turning center equipped with:
- A main spindle – holds and rotates the workpiece for initial machining.
- A sub spindle (secondary spindle) – located opposite the main spindle, it can take over the workpiece mid-process for machining the other end.
This setup allows complete machining of a part without manual intervention, enabling “done-in-one” manufacturing.
How It Works
- Loading & Initial Machining:
- The bar stock or part is loaded into the main spindle.
- Facing, turning, drilling, etc., are performed on one end.
- Transfer to Sub Spindle:
- The main spindle partially retracts.
- The sub spindle moves in, grabs the part, and takes over rotation.
- Back-Side Machining:
- While the sub spindle holds the part, operations like facing, drilling, threading, or grooving are done on the opposite end.
- Meanwhile, the main spindle can begin working on the next part.
- Unloading:
- After completion, the finished part is ejected from the sub spindle.
- The cycle repeats automatically.
Advantages of a Sub Spindle CNC Lathe
| Benefit | Description |
|---|---|
| Reduced Cycle Time | Enables simultaneous or sequential machining without manual handling. |
| High Precision | Minimizes alignment errors since the part doesn’t need to be rechucked manually. |
| Increased Productivity | Allows continuous operation; ideal for high-volume production. |
| Complex Part Capability | Can machine both ends and internal features in one cycle. |
| Automation Friendly | Easily integrated with bar feeders, gantry loaders, or robotic systems. |
Common Applications
- Medical components (e.g., surgical tools)
- Automotive parts (shafts, connectors)
- Aerospace fittings
- Precision bushings and pins
- Electronics hardware
Example Machines
- Mazak Quick Turn Nexus Series
- Doosan Puma TT Series
- Okuma Multus Series (multi-tasking lathes)
- Citizen Swiss-Type Lathes (with sub spindles)
Tips for Using a Sub Spindle Lathe
- Ensure proper synchronization between main and sub spindles.
- Use precise transfer parameters to avoid collisions.
- Optimize tool paths for both spindles to balance cycle time.
- Regular maintenance of spindle alignment and coolant systems.
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