CN-C40E / CN-K40D Flat Bed CNC Lathe for Stable Small Metal Parts Machining
The CN-C40E and CN-K40D flat bed CNC lathe models are designed for manufacturers that need a compact, stable, and practical turning solution for small-to-medium metal workpieces. With a maximum swing diameter of 400mm over the lathe and available workpiece lengths of 750mm and 1000mm, these machines are suitable for shafts, sleeves, bushings, threaded parts, fittings, repair parts, and general mechanical components.
For B2B buyers, a CNC turning lathe must do more than complete basic cutting. It needs to maintain repeatable accuracy, reduce vibration, support smooth carriage movement, and remain easy to operate in daily production. The CN-C40E and CN-K40D are built around these needs with a monolithic conjoined lathe bed, plastic-coated guide rail sliding surface, 4-station turret, MT4 tailstock, and stable machining consistency.
As a small CNC lathe machine, this series is suitable for workshops that need reliable turning capacity without using excessive floor space. It can support production machining, repair machining, custom CNC turning, and small-batch component manufacturing.
Key Features
400mm Swing Over Lathe
The CN-C40E and CN-K40D both support a 400mm maximum swing diameter over the lathe. This provides enough turning space for many common small-to-medium workpieces, including sleeves, collars, bushings, flanges, threaded components, and shaft-type parts.
For factories that do not need a large heavy-duty machine, this size offers a practical balance between machining range and workshop footprint.
750mm and 1000mm Workpiece Length Options
The machines are available with two workpiece length options:
- 750mm
- 1000mm
The maximum processing length from the tailstock to the chuck jaw is 640mm for the 750mm version and 890mm for the 1000mm version. This allows buyers to choose the proper model based on actual shaft length, part size, and factory layout.
Monolithic Conjoined Lathe Bed
The machine uses a monolithic conjoined structure of the lathe bed. This helps improve machine integrity and supports stable machining during turning operations.
For a flat bed CNC lathe, bed structure is important because it affects rigidity, vibration control, and long-term machining consistency.
Plastic-Coated Guide Rail Sliding Surface
The sliding surface of the lathe rail uses plastic sticking, which helps reduce friction damping. Lower friction supports smoother movement of the carriage and helps improve machining stability.
This is useful for repeated turning, finishing, and threading operations where smooth axis movement can affect final surface quality.
Stable IT7–IT6 Machining Accuracy
The document states that the machine can achieve stable IT7–IT6 precision, and the processing surface roughness can reach Ra1.6. This makes the machine suitable for general precision turning applications where dimensional consistency and surface quality are important.
For B2B production, stable accuracy helps reduce rework and supports more reliable batch machining.
Different Spindle Options for Different Buyers
The two models provide different spindle configurations:
CN-C40E Independent Spindle
The CN-C40E uses an independent spindle with continuous speed regulation from 50–3000r/min. It has a 62mm spindle bore and allows a maximum bar diameter of 60mm through the spindle hole.
This model is suitable for buyers who need wider spindle speed flexibility and larger through-spindle bar capacity.
CN-K40D Automatic Gear Change
The CN-K40D uses a three-gear automatic shift gearbox with a spindle speed range of 60–2000r/min:
- High range: 275–2000r/min
- Medium range: 112–820r/min
- Low range: 60–440r/min
It has a 52mm spindle bore and allows a maximum bar diameter of 50mm through the spindle hole. This model is suitable for buyers who prefer geared speed selection for different cutting conditions.
4-Station Turret
Both models use a 4 standing station turret with a 25 × 25mm² turret section size. This supports common turning operations such as external turning, boring, grooving, threading, and facing.
The 4-station design is simple, practical, and suitable for workshops that need reliable tool arrangement without overly complex operation.
MT4 Tailstock Support
The tailstock quill uses MT4 taper, with a maximum quill stroke of 130mm and ±10mm transverse movement. Tailstock support is useful when machining longer shafts, rods, or parts that require better end support during turning.
Benefits for B2B Manufacturing Buyers
Practical for Small and Medium Workshops
The CN-C40E and CN-K40D are suitable for workshops that need a dependable small CNC lathe machine for daily production. Their compact machine dimensions, 400mm swing capacity, and 750/1000mm length options make them easy to integrate into existing production lines.
Stable Machining Quality
With IT7–IT6 stable precision and Ra1.6 surface roughness capability, these machines can support reliable turning quality for general industrial parts. This is useful for suppliers producing shafts, sleeves, fittings, bushings, and replacement parts.
Flexible Model Selection
The CN-C40E is better for buyers needing continuous spindle speed regulation and larger bar capacity through the spindle. The CN-K40D is better for buyers needing automatic gear shift speed ranges and a practical geared spindle structure.
This allows manufacturers to choose the machine according to their material type, part size, cutting process, and production preference.
Suitable for Custom CNC Turning
As a CNC turning lathe, this series is suitable for custom machining service providers handling different drawings and small-batch production. The machines can process a variety of cylindrical metal components with stable repeatability.
Lower Friction and Smoother Movement
The plastic-coated guide rail sliding surface reduces friction damping, supporting smoother movement during machining. This contributes to better surface quality and stable operation over repeated production cycles.
Technical Specifications
| Item | CN-C40E | CN-K40D |
|---|---|---|
| Machine Type | Flat Bed CNC Lathe | Flat Bed CNC Lathe |
| Max. Swing Diameter Over Lathe | 400 mm | 400 mm |
| Max. Workpiece Length | 750 mm | 1000 mm |
| Max. Processing Diameter Over Lathe | 400 mm | 400 mm |
| Max. Processing Diameter on Sliding Plate | 220 mm | 220 mm |
| Max. Processing Length | 640 mm | 890 mm |
| Max. Bar Diameter Through Spindle | 60 mm | 50 mm |
| Height of Center | 200 mm | 200 mm |
| Tailstock Dimension | 750 mm | 1000 mm |
| Spindle Bore | 62 mm | 52 mm |
| Spindle Head Collet Taper | 1:20 Ø70mm | Morse Cone 6 |
| Spindle Speed | Continuous speed regulation, 50–3000r/min | Three-gear automatic shift, 60–2000r/min |
| CN-K40D High Speed Range | — | 275–2000r/min |
| CN-K40D Medium Speed Range | — | 112–820r/min |
| CN-K40D Low Speed Range | — | 60–440r/min |
| Max. Longitudinal Travel of Turret | 750 mm | 1000 mm |
| Max. Transverse Travel of Turret | 230 mm | 230 mm |
| Longitudinal Rapid Movement Speed | 8000 mm/min | 8000 mm/min |
| Transverse Rapid Movement Speed | 4000 mm/min | 4000 mm/min |
| Turret Station Number | 4 standing station | 4 standing station |
| Turret Section Size | 25 × 25 mm² | 25 × 25 mm² |
| Tailstock Quill Cone | MT4 | MT4 |
| Max. Tailstock Quill Stroke | 130 mm | 130 mm |
| Max. Tailstock Transverse Movement | ±10 mm | ±10 mm |
| Main Motor Power | 5.5 / 7.5kW servo | 5.5 / 7.5kW servo |
| Z-Axis Servo Motor Torque | 6N·m | 6N·m |
| X-Axis Servo Motor Torque | 4N·m | 4N·m |
| Cooling Pump | AYB-20, 0.115kW | AYB-20, 0.115kW |
| Turret Model | LD4 | LD4 |
| Machine Dimension | 1952.5 × 1110 × 1774mm | 2400.5 × 1110 × 1774mm |
| Machine Weight | 1600kg | 1700kg |
Application Scenarios
Shaft and Sleeve Machining
The CN-C40E and CN-K40D are suitable for shaft parts, sleeves, collars, bushings, and rods. Their tailstock support and stable bed structure help improve machining stability for longer cylindrical parts.
Threaded Metal Parts
The machines can be used for threaded rods, connectors, adapters, sleeves, and other threaded components. The 4-station turret supports practical tool arrangement for turning and threading processes.
Repair and Replacement Parts
For equipment repair workshops, this CNC turning lathe can process replacement shafts, pins, bushings, spacers, collars, and simple mechanical components.
Small Batch Custom Turning
For job shops and CNC machining suppliers, the machines are suitable for different customer drawings, small-batch orders, and general-purpose turning work.
Industrial Fittings and Hardware
The CN-C40E and CN-K40D can be used to process fittings, small flanges, threaded sleeves, mechanical hardware, and other cylindrical components used in industrial equipment.
Model Selection Guide
Choose CN-C40E When You Need Continuous Speed Regulation
The CN-C40E is suitable for buyers who need a wider spindle speed range from 50–3000r/min and a larger 62mm spindle bore. It is a good option for workshops processing varied materials and parts that require flexible speed control.
Choose CN-K40D When You Need Automatic Gear Change
The CN-K40D is suitable for buyers who prefer a three-gear automatic shift gearbox. Its 60–2000r/min speed range provides high, medium, and low speed options for different turning conditions.
Choose by Workpiece Length
If most parts are shorter, the CN-C40E 750mm version may be more space-saving. If parts require longer support and larger processing length, the CN-K40D 1000mm version provides up to 890mm processing length.
Choose by Bar Diameter
If larger through-spindle bar capacity is required, the CN-C40E supports up to 60mm bar diameter through the spindle. The CN-K40D supports up to 50mm bar diameter.
Why Choose the CN-C40E / CN-K40D Flat Bed CNC Lathe?
Compact and Practical CNC Turning Platform
This series is suitable for manufacturers that need a practical flat bed CNC lathe for small-to-medium metal parts without requiring a large machine footprint.
Stable Accuracy and Surface Finish
With stable IT7–IT6 precision and Ra1.6 surface roughness capability, the machines support reliable machining quality for general industrial components.
Two Spindle Configuration Choices
The CN-C40E offers continuous speed regulation, while the CN-K40D offers three-gear automatic shift. This gives buyers more flexibility when selecting equipment for their production process.
Suitable for B2B Production and Repair Work
These machines are suitable for metalworking factories, repair workshops, machinery parts suppliers, shaft processing shops, and CNC turning service providers.
FAQ
Q1: What are the CN-C40E and CN-K40D mainly used for?
They are mainly used for shafts, sleeves, bushings, threaded parts, fittings, repair parts, small flanges, and general metal turning components.
Q2: Are these machines flat bed CNC lathes?
Yes. Both models are flat bed CNC lathe machines with a monolithic lathe bed structure and practical CNC turning capability.
Q3: What is the main difference between CN-C40E and CN-K40D?
The CN-C40E uses an independent spindle with continuous speed regulation from 50–3000r/min and a 62mm spindle bore. The CN-K40D uses a three-gear automatic shift gearbox from 60–2000r/min and a 52mm spindle bore.
Q4: What is the maximum swing diameter?
Both models support a maximum swing diameter of 400mm over the lathe.
Q5: What is the maximum processing length?
The CN-C40E supports 640mm maximum processing length, while the CN-K40D supports 890mm maximum processing length.
Q6: What accuracy can the machines reach?
According to the document, the machines can stably reach IT7–IT6 precision, and the processing surface roughness can reach Ra1.6.
Q7: Which model is better for larger bar stock?
The CN-C40E supports a larger through-spindle bar diameter of 60mm, while the CN-K40D supports 50mm.
