CNC Turn-Mill Machined Parts

Capability	Typical Specification
Max. Turning Diameter	Ø300 mm
Max. Turning Length	500 mm
Bar Capacity	Up to Ø65 mm
Milling Spindle Speed	Up to 12,000 rpm
Y-Axis Travel	±50 mm
C-Axis Positioning	0.001°
Turning Tolerance	±0.01 mm
Milling Tolerance	±0.02 mm
Hole Diameter Tolerance	±0.01–0.02 mm
Surface Roughness	Ra 0.8–3.2 μm
Threading	Metric, UNC, UNF and custom threads
Part Length-to-Diameter Ratio	Up to 10:1
Production Volume	Prototypes to 10,000+ pcs
CAD File Formats	STEP, STP, IGES, X_T, DWG, DXF, PDF

 

Choosing the right CNC machining process depends mainly on the part's geometry and machining features. CNC turning is best suited for parts with primarily rotational geometry, while CNC milling is ideal for plates, blocks, and parts requiring multi-face milling. CNC turn-mill machining combines turning and milling operations in a single machine, making it particularly suitable for complex parts that feature both cylindrical geometries and milled features such as holes, slots, flats, and off-center holes.

 

Feature	CNC Turning	CNC Turn-Mill	CNC Milling
Primary Geometry	Cylindrical	Cylindrical + milled features	Prismatic / complex surfaces
Turning Operations	Excellent	Excellent	Limited
Milling Operations	Limited	Excellent	Excellent
Cross Holes	Limited	Excellent	Excellent
Off-Center Features	Limited	Excellent	Excellent
Threads	Excellent	Excellent	Good
Typical Parts	Shafts, pins, bushings	Fittings, valve parts, connectors, complex shafts	Plates, brackets, housings
Multiple Setups	Often required for complex features	Fewer setups	Often required for rotational features
Best Advantage	Efficient cylindrical machining	Complex parts in fewer setups	Flexible multi-face machining

 

When to Choose CNC Turn-Mill

Choose CNC Turn-Mill machining when your part is primarily rotational but also requires cross holes, slots, flats, pockets, off-center holes, keyways or other milled features. Combining these operations can reduce repositioning, improve feature-to-feature alignment, and simplify production of complex components.

 

Need Help Choosing the Right CNC Machining Process?
Send us your 2D drawing or 3D CAD file. Our engineers can recommend the most suitable machining process based on your part geometry, tolerances, material, and production volume.

 

Have a Complex Turn-Mill Part? Send Us Your Drawing

We provide precision turn-mill machining with tolerances and surface finishes tailored to part geometry, material, and application requirements. Tight tolerances can be applied to critical dimensions, while different machining and finishing options are available to meet functional and cosmetic requirements.

 

Turn-Mill Machining Tolerances

Quality Item	Typical Capability
Standard Dimensional Tolerance	±0.05 mm
Precision Dimensional Tolerance	±0.01–0.02 mm
Hole Diameter Tolerance	±0.01–0.02 mm
Shaft Diameter Tolerance	±0.01–0.02 mm
Position Tolerance	Up to 0.02 mm
Surface Roughness	Ra 0.8–3.2 μm
Fine Machined Finish	Up to Ra 0.4 μm*
Thread Tolerance	According to specified thread standard
Edge / Chamfer	According to drawing requirements

 

Surface Finish Options

As Machined - Standard CNC machined surface

Polishing - Smoother and more uniform appearance

Brushing - Directional surface texture

Anodizing - Corrosion and wear protection for aluminum

Electroless Nickel Plating - Improved hardness and corrosion resistance

Black Oxide - Protective finish for steel components

Zinc Plating - Corrosion protection for steel parts

 

Every turn-mill part is inspected against the approved drawing and specified quality requirements. Inspection covers material, dimensions, tolerances, threads, surface finish, and critical geometric features to ensure consistent quality from prototype to production.

Quality Control Item	Inspection Method	Typical Equipment
Material Verification	Material grade & certificate verification	Material Certificate / PMI
Dimensional Inspection	Diameter, length, thickness measurement	Calipers, Micrometers
Hole & Bore Inspection	Bore diameter and depth verification	Bore Gauges, Pin Gauges
Thread Inspection	Internal & external thread verification	Thread Gauges
Geometric Tolerances	Position, concentricity, perpendicularity	CMM
Surface Roughness	Ra measurement	Surface Roughness Tester
Visual Inspection	Burrs, scratches, dents, surface defects	Visual Inspection
Final Inspection	Full dimensional check against drawing	CMM / Inspection Report

 

Need specific inspection requirements? Send your drawing and quality specifications with your RFQ.

 

Have a Turn-Mill Part for Your Application? Send us your 2D drawing or 3D CAD file for a machining review and quotation.

 

Choose CNC Turn-Mill When Your Part Has:

01 - Primarily Cylindrical Geometry
Ideal for shafts, pins, bushings, fittings, and other rotational components.

 

02 - Cross or Off-Center Holes
Suitable when radial holes or holes at different positions need to be machined on a turned component.

 

03 - Milled Flats, Slots or Keyways
Turn-mill machines can add flats, slots, keyways, and other milling features without transferring the part to another machine.

 

04 - Multiple Threads and Features
Suitable for components requiring internal/external threads, grooves, holes, and milled surfaces.

 

05 - Complex Features in Multiple Orientations
Useful when several features need to be machined from different directions while maintaining their positional relationship.

 

06 - Fewer Setups Are Preferred
Combining operations can reduce workpiece repositioning, handling time, and potential setup-related errors.

 

Turn-Mill Is Especially Valuable When:

Turning Only → The part is mostly cylindrical with simple features.
Milling Only → The part is primarily prismatic or block-shaped.
Turn-Mill → The part combines cylindrical geometry + complex milled features.

 

Not sure whether turn-mill machining is suitable for your part? Send us your drawing or 3D CAD file for a machining recommendation.

 

 

 

 

We use appropriate packaging methods to protect precision turn-mill machined parts from scratches, impact, contamination, and moisture during storage and transportation. Lead time depends on part complexity, material availability, surface treatment, inspection requirements, and order quantity.

 

Packaging Options

Individual Protection
Small and precision parts can be individually wrapped or separated to prevent contact damage.

Bulk Packaging
Suitable for larger production quantities, with protective materials used to prevent part-to-part collision.

Custom Packaging
Packaging can be customized according to part size, weight, shape, and customer requirements.

Export Packaging
Parts can be packed in reinforced cartons, wooden cases, or pallets for international transportation.

 

Typical Lead Time

Order Type	Typical Lead Time
Prototype / Sample	7–15 business days
Small Batch	10–20 business days
Production Orders	15–30 business days
Custom Surface Treatment	+3–10 business days

Lead times are estimates and may vary depending on material availability, part complexity, quantity, surface treatment, and inspection requirements.

 

Need a specific delivery date? Send your drawings, quantity, material, and required finish for a production schedule. 

 

1. What is CNC turn-mill machining?

CNC turn-mill machining combines turning and milling operations in one CNC machine. It is suitable for parts with cylindrical features as well as holes, slots, flats, threads, and other milled features.

 

2. What parts are suitable for CNC turn-mill machining?

Typical parts include complex shafts, pins, bushings, sleeves, fittings, valve components, connectors, and coupling components that require both turning and milling operations.

 

3. What materials can you CNC turn-mill?

We can machine common metals including aluminum, stainless steel, carbon steel, alloy steel, brass, copper, and titanium. Specific material grades can be processed according to your drawing and requirements.

 

4. What is the difference between CNC turning and turn-mill machining?

CNC turning is primarily used for rotational parts, while turn-mill machining combines turning with milling, drilling, tapping, and other operations. Turn-mill machining is better suited to complex rotational parts with multiple secondary features.

 

5. What tolerances can CNC turn-mill machining achieve?

Typical dimensional tolerances can reach ±0.01–0.02 mm for selected features. The achievable tolerance depends on the material, part geometry, feature size, machine configuration, and drawing requirements.

 

6. Can you machine cross holes and off-center holes?

Yes. Turn-mill machining can produce radial, cross, and off-center holes as well as slots, flats, keyways, and other features on turned components.

 

7. Can you produce prototypes and small batches?

Yes. CNC turn-mill machining can be used for prototypes, low-volume production, and larger production runs. Production quantities are evaluated based on part complexity and project requirements.

 

8. What file formats do you accept?

We typically work with STEP, STP, IGES, X_T, DWG, DXF, and PDF files. A 3D CAD model together with a dimensioned 2D drawing is preferred for accurate quotation and production.

 

9. Can you provide inspection reports?

Yes. Depending on project requirements, inspection documentation can include dimensional inspection reports, CMM reports, material certificates, surface roughness reports, and final inspection reports.

 

10. How do I get a CNC turn-mill machining quote?

Send us your 2D drawing or 3D CAD file, along with the material, quantity, surface finish, tolerance requirements, and expected delivery date. We can then review the part and provide a quotation and estimated lead time.

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