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Our CNC lathes and live-tool turn-mill equipment support a wide range of external and internal turned features, including diameters, bores, grooves, tapers, shoulders, and threads. Live tooling also allows selected milling operations to be completed in fewer setups, helping improve feature-to-feature consistency and production efficiency.
High-precision cylindrical and rotational machining engineered for shafts, bushings, pins, and custom threaded fittings with tight concentricity.
Exceptional machinability for high-speed CNC turning. Ideal for lightweight round shafts, precision pulleys, flanged adapters, and threaded tubular parts with excellent concentricity.
Precision shafts, bushings, threaded collars, sensor housings, cylindrical spacers, and optical lens barrels.
Type II/III anodizing, bright dipping, clear passivation, bead blasting, micro-polishing, and laser marking.
Turned Aluminum 6061 / 7075 Shafts
Fast and cost-effective lathe turning for cylindrical plastic stock. Excellent impact strength and dimensional stability for non-load-bearing round housings and prototypes.
Round instrument caps, sensor sleeves, plastic bobbins, protective threaded plugs, and test spacers.
As-turned smooth, rotary fine sanding, vapor smoothing, painting, and pad printing.
Turned ABS Cylindrical Components
Capability | Machining Range | Important Considerations |
Maximum Part Diameter | Up to Ø800 mm | Actual capacity depends on part length, geometry, material, weight, tooling clearance, and workholding method. |
Maximum Part Length | Up to 1500 mm | Long or slender parts may require tailstock or steady-rest support. |
Maximum Bar-Feed Diameter | Up to Ø65 mm | Suitable for repeat production when the material, stock form, part length, and geometry are compatible with automatic feeding. |
Standard Machining Tolerance | Typically ±0.05 mm | Suitable for general turned dimensions and non-critical features. |
Precision Machining Tolerance | Down to ±0.01 mm | Available for selected critical features after engineering review. |
Please submit your 3D CAD model and fully dimensioned 2D drawing so our engineering team can confirm machine capacity, workholding, tolerances, and inspection requirements.
CNC turning tolerances define the allowable variation between the dimensions specified on a 2D technical drawing and the finished machined part. Tighter tolerances may require additional machining passes, controlled workholding, and more extensive inspection, which can affect cost and lead time.
Tolerance Category | Metric Capability | Imperial Capability | Typical Applications |
Standard Machining Tolerance | Typically ±0.05 mm | Typically ±0.002 in | General diameters, lengths, grooves, shoulders, and non-critical turned features |
Precision Machining Tolerance | Down to ±0.01 mm | Down to ±0.0004 in | Selected critical diameters, bearing fits, locating features, mating surfaces, and assembly interfaces |
Geometric Tolerances | Drawing-dependent | Drawing-dependent | Runout, cylindricity, concentricity, perpendicularity, position, and profile requirements |
Achievable tolerances depend on the material, part diameter and length, geometry, wall thickness, length-to-diameter ratio, surface finish, workholding, and inspection method. Please identify all critical dimensions, fits, and geometric tolerances on your 2D drawing.
Unless otherwise agreed, dimensional tolerances apply before plating, anodizing, heat treatment, or other secondary processes.
Use these general design recommendations to improve machinability, dimensional stability, and cost efficiency. These values are recommended starting points rather than fixed manufacturing limits. Final feasibility depends on the material, geometry, tolerances, quantity, and application requirements.
Design Feature | Recommended Guideline | Practical Considerations |
Length-to-Diameter Ratio | Additional support may be required above approximately 4:1 | Long, slender parts are more susceptible to vibration, tool deflection, taper, and dimensional variation. |
Minimum Wall Thickness | Metals: ≥0.8 mm; plastics: ≥1.5 mm | Thin walls may deform under chuck pressure or cutting forces. Thinner walls may be possible after engineering review. |
Internal Corner Radii | Add a radius of ≥0.4 mm where permitted | Turning tools cannot produce perfectly sharp internal shoulders. A radius or relief groove improves tool clearance and reduces stress concentration. |
Internal Bore Depth | Keep the depth-to-diameter ratio at approximately 4:1 or less where possible | Deep, narrow bores require longer boring bars and may increase vibration, chip-removal difficulty, and surface variation. |
Threads | Use standard metric or imperial thread sizes | Standard thread forms reduce tooling requirements. A thread-relief groove may be needed near a shoulder. |
Thread Engagement | Specify only the functional thread length required | Excessive thread depth increases machining time and may complicate chip evacuation without proportionally improving joint strength. |
Grooves and Undercuts | Use standard widths and radii where possible | Standard dimensions allow readily available tools to be used and help reduce tooling cost and lead time. |
Knurling | Standard straight or diamond patterns preferred | Standard patterns and pitches reduce special tooling requirements. Final appearance depends on the material, diameter, and pitch. |
Dimensional Tolerances | Standard: ±0.05 mm; down to ±0.01 mm for selected critical features | Apply tight tolerances only to functional diameters, fits, locating features, and other critical dimensions. |
Surface Roughness | Typical as-turned finish: approximately Ra 1.6–3.2 μm | Finer finishes may require additional finishing passes, polishing, or precision grinding. |
Please submit your 3D CAD model and fully dimensioned 2D drawing for a project-specific DFM and machining feasibility review.
High-precision rotational and cylindrical manufacturing engineered for mission-critical pins, shafts, bushings, and custom threaded fittings.
CNC turning is a subtractive manufacturing process in which the workpiece rotates while computer-controlled cutting tools remove material. It is commonly used to produce cylindrical and rotationally symmetrical parts with external diameters, internal bores, grooves, shoulders, tapers, and threads.
Live-tool turn-mill equipment can also produce flats, slots, cross-holes, keyways, and other milled features without transferring the part to a separate milling machine.
High-Precision CNC Lathe Spindle
Turn-Mill Cost Optimization
Turning expenditures are primarily driven by raw stock bar diameter, material machinability, cycle time, setup frequency, tight tolerances, and secondary finishes. Our engineers recommend actionable DFM optimizations:
Common turning risks include tool deflection, vibration chatter, taper error, chucking distortion on thin tubes, and dimensional runout. We mitigate these through precision chucking, thermal drift control, and rigorous in-process checks.
Quality-Controlled Turning Center
50+ CNC Machines & Multi-Axis Turning Fleet
Equipped with 50+ CNC machines supporting 2-axis, 3-axis, and multi-axis live-tool turning, milling, EDM, and grinding, TENGHUI delivers custom prototypes and production runs with speed and repeatability.
Explore a selection of custom shafts, pins, bushings, sleeves, fittings, connectors, rollers, threaded components, and turn-mill parts manufactured in a wide range of metals and engineering plastics.
Each project is produced according to the customer’s drawings, material specifications, tolerances, surface finishes, and inspection requirements.
Our CNC turning capacity includes parts up to Ø800 mm in diameter and components up to 1500 mm in length. These maximum dimensions may not be achievable simultaneously. Actual capacity depends on the part geometry, material, weight, tooling clearance, and workholding requirements.
Our standard CNC turning tolerance is typically ±0.05 mm. Tolerances down to ±0.01 mm can be achieved for selected critical diameters and features after engineering review.
Long, slender parts may require tailstock support, a steady rest, staged machining, or adjusted cutting parameters to control vibration and deflection. We review the length-to-diameter ratio, material, geometry, and tolerance requirements before selecting the machining method.
Yes. Live-tool turn-mill equipment can produce turned diameters together with flats, slots, cross-holes, keyways, and other milled features in fewer setups. Feasibility depends on the geometry, feature locations, tooling access, and tolerance requirements.
Yes. As a general design guideline, we recommend minimum wall thicknesses of 0.8 mm for metals and 1.5 mm for engineering plastics. Thinner walls may be possible, but they require engineering review because chuck pressure and cutting forces may cause deformation.
We support common metric and imperial threads, internal and external grooves, thread-relief features, and standard straight or diamond knurling patterns. Please specify the applicable standard, tolerance class, groove dimensions, and knurling requirements on your 2D drawing.
CNC turning rotates the workpiece and is generally best suited to cylindrical parts such as shafts, pins, bushings, and sleeves. CNC milling uses rotating cutting tools on a stationary workpiece and is better suited to plates, brackets, housings, pockets, and parts with multiple flat or contoured features.
Parts containing both turned and milled features may be produced using live-tool turn-mill machining or a combination of both processes.
Please provide a 3D CAD model, a fully dimensioned 2D drawing, material grade, quantity, tolerances, surface finish, inspection requirements, and target delivery date. STEP or STP files and PDF drawings are preferred.
Yes. Material mill certificates, dimensional inspection reports, CMM reports, and surface-treatment certificates can be provided upon request. Please specify documentation requirements before ordering so they can be included in the quotation and production plan.
Lead time depends on the material, part complexity, quantity, tolerances, secondary processes, and inspection requirements. A project-specific production schedule will be provided after our engineering team reviews your drawings.
If you have any questions or would like to book a session please contact us.
Once we receive your design files, our senior manufacturing engineers will manually perform a comprehensive DFM review and deliver an accurate, optimized quote within 24 hours.
