- Ellyn@tenghui-proto.com
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Tenghui provides high-precision CNC turning services for cylindrical and rotationally symmetrical parts. Equipped with advanced CNC lathes, live tooling, and sub-spindles, we efficiently manufacture custom shafts, pins, and bushings. We deliver tight tolerances down to ±0.01 mm and rapid 3-to-7 day turnarounds for both prototyping and high-volume production.
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Advanced dual-axis lathes and multi-axis turn-mill centers engineered for high-precision, rotationally symmetrical components. We deliver tight tolerances down to ±0.01 mm from prototyping to high-volume production.
CNC turning tolerances specify the allowable deviation between your 3D CAD design dimensions and the actual machined cylindrical component. Achieving tighter tolerances ensures high concentricity and a perfect press-fit for shafts, pins, and rotating parts, supported by our advanced lathes and precision inspection.
| Machine Type | Typical Tolerance (Metric) | Typical Tolerance (Imperial) | Precision Level | Common Applications |
|---|---|---|---|---|
| Dual-Axis CNC Turning | ±0.005 mm to ±0.001 mm | ±0.002" to ±0.001" | Standard to Medium | Simple cylindrical parts, standard custom fasteners, custom spacers, straight pins, and simple bushings. |
| Multi-Axis Turn-Mill | ±0.005 mm to ±0.01 mm | ±0.001" to ±0.0004" | Medium to High Precision | Complex multi-featured shafts, aerospace fittings, high-concentricity industrial valves, and medical components. |
Review our recommended design guidelines to optimize your rounded and cylindrical components for seamless CNC lathe production. By aligning your 3D models with these turning best practices, you can effectively enhance concentricity, shorten machining cycles, and lower production costs.
| Design Feature | Design Recommendation | Engineering Best Practices |
|---|---|---|
| Maximum Part Length | Standard: ≤800 mm Length: 1500 mm |
Parts within bar feed limits can be manufactured continuously from raw stocks, drastically maximizing high-volume throughput. |
| Length-to-Diameter (L/D) Ratio | Unsupported: ≤ 3:1 With Tailstock support: ≤ 8:1 |
Long, slender shafts exceeding a 3:1 ratio without tailstock support will suffer from severe tool chatter and geometric deflection. |
| Minimum Wall Thickness | Metal: ≤ 0.5 mm Plastic: ≤ 1.0 mm |
Thin cylindrical walls are prone to deformation due to chuck clamping pressures and heavy tool cutting forces. |
| Internal Corners (Stepped Shafts) | Add fillet radius: ≥ 0.4 mm Or design a tool relief undercut |
Sharp internal step corners accumulate high stress concentration. Adding small radii or undercuts ensures clean tool clearance. |
| Boring & Internal Cavity Depth | Depth: ≤ 4x Cavity Diameter | Deep internal boring complicates chip evacuation and requires long boring bars, which increases the risk of internal vibration. |
| External & Internal Threads | Standard Metric/Imperial threads Provide a thread relief groove |
Standard threads ensure lower tooling costs. A thread relief groove allows the threading tool to exit cleanly at the shoulder end. |
| Machining Tolerances | Standard: ±0.05 mm Precision Limit: ±0.01 mm |
Tighter tolerances on concentricity and cylindrical diameters require precise multi-stage machining cuts and strict CMM inspection. |
| Knurling Features | Straight or Diamond patterns Standard pitches preferred |
Knurling is ideal for enhancing manual grip. Stick to standard pitches to avoid custom knurling wheel setups and reduce expenses. |
Common Grades: 6061, 7075, 2024
Key Features: Lightweight, highly corrosion-resistant, excellent machinability, and great thermal conductivity.
Typical Applications: Aerospace brackets, automotive engine parts, custom electronic enclosures, and functional rapid prototypes.
Common Grades: C101, C110
Key Features: Ultra-high thermal and electrical conductivity, excellent ductility, and natural antimicrobial properties.
Typical Applications: High-efficiency heat sinks, electrical busbars, power distribution blocks, and grounding terminals.
Common Grades: C360 / Free-Cutting Brass
Key Features: Outstanding machinability, low friction coefficient, non-sparking, and great electrical conductivity.
Typical Applications: Threaded pipe fittings, fluid valve bodies, compression couplings, and electronic terminal connectors.
Common Grades: 303, 304, 316, 17-4 PH
Key Features: Exceptional rust and corrosion resistance, high structural strength, and premium aesthetic metallic finish.
Typical Applications: Surgical instruments, medical devices, marine hardware, and food processing equipment components.
Common Grades: 1018, 1045, 4140
Key Features: High tensile strength, rugged and durable, responds well to heat treatment, and highly cost-effective.
Typical Applications: Industrial drive shafts, heavy-duty structural frames, mechanical gears, and manufacturing tools.
Common Grades: 1018, 1020, A36
Key Features: Excellent machinability, highly ductile and weldable, easy to case-harden, and highly economical for structural parts.
Typical Applications: Mounting brackets, custom fixtures, automotive structural supports, baseplates, and machine links.
Common Grades: Grade 2 (Pure), Grade 5 (Ti-6Al-4V)
Key Features: Extreme strength-to-weight ratio, superb biocompatibility, and outstanding temperature/chemical resistance.
Typical Applications: Aerospace structural links, medical implants, bone screws, and high-performance racing components.
Key Features: Lightweight, excellent impact resistance, high mechanical strength, and outstanding dimensional stability.
Typical Applications: Custom electronic enclosures, functional prototypes, consumer goods, and automotive interior panels.
Key Features: High structural strength, low friction coefficient, exceptional wear resistance, and high stiffness.
Typical Applications: Precision gears, industrial bearings, custom fixtures, guide rollers, and mechanical linkages.
Key Features: Rugged and durable, high wear resistance, excellent toughness, and low coefficient of friction.
Typical Applications: Wear sleeves, bushings, industrial rollers, spacers, and durable washers.
Key Features: Outstanding high-temperature limits, superior chemical isolation, and excellent tensile strength.
Typical Applications: Aerospace structural components, medical devices, oil & gas valve seats, and semiconductor parts.
Key Features: High strength-to-weight ratio, extremely lightweight, and excellent resistance to chemical corrosion.
Typical Applications: Food packaging containers, chemical fluid tanks, automotive components, and medical instrument housings.
Key Features: Extremely lightweight, 100% waterproof, excellent chemical passive behavior, and high toughness.
Typical Applications: Industrial water tanks, cutting boards, protective gaskets, seals, and fluid containers.
Key Features: Optical-grade transparency, extreme impact strength, and high heat and dimensional stability.
Typical Applications: Clear display lens covers, protective face shields, light guides, and transparent device housings.
CNC (Computer Numerical Control) turning is a precise subtractive manufacturing process where the raw material block rotates at high speeds in a chuck while a stationary cutting tool shapes the part. Controlled by pre-programmed G-code software, the cutting tool moves along the workpiece to remove material, making it the most efficient method for producing high-accuracy cylindrical, rounded, or symmetrical components.
The manufacturing cost of CNC turned parts is primarily determined by raw material choice, part length-to-diameter (L/D) ratio, and total machining setups. Utilizing standard bar stock sizes that fit automatic bar feeders drastically reduces manual labor cost. To lower expenses, avoid designing ultra-long, slender profiles that require extra support fixtures, and specify tight tolerances only where functionally essential.
Precision turning demands rigid quality controls to eliminate common rotational defects. Problems like part taper from tool deflection, surface rough ridges from incorrect feed rates, and part warping from uneven chuck clamping pressure can compromise quality. Tenghui prevents these errors through calibrated tailstock support, real-time cutting path monitoring, and automated in-line inspection.
Choosing Tenghui means working with a direct source manufacturer. Equipped with advanced dual-axis lathes and multi-axis turn-mill centers, we guarantee high concentricity, precision tolerances down to ±0.01 mm, and rapid 3-to-7 day lead times. Our team provides free engineering DFM design feedback within 24 hours and delivers fully customized, turnkey surface post-processing under one single roof.
Our standard CNC lathes handle part diameters up to 300 mm. For high-volume production using our automatic bar feeders, the maximum raw bar diameter is limited to 65 mm. If you have oversized shafts or long cylindrical components, please share your 3D CAD models so our team can verify our specific machine bed clearances.
When machining long parts, a high length-to-diameter (L/D) ratio can cause tool chatter and structural bending. For any parts exceeding a 3:1 ratio, Tenghui utilizes calibrated tailstocks or steady rests to provide rigid mechanical support. This setup counteracts cutting forces, eliminates taper defects, and ensures strict concentricity along the entire shaft length.
Yes. By utilizing our advanced multi-axis turn-mill centers equipped with live tooling and sub-spindles, we can perform secondary operations like cross-drilling, flat milling, slots, and off-axis tapped holes directly on the lathe. This eliminates the need for a separate setup on a milling machine, lowering manual labor costs and boosting part accuracy.
For precision turned metal sleeves (like Aluminum or Stainless Steel), we recommend keeping a minimum wall thickness of 0.5 mm, and 1.0 mm for engineering plastics. Walls thinner than this can easily deform or warp under heavy chuck clamping pressures and cutting forces during high-speed rotation.
We support both straight and diamond knurling patterns across a wide range of standard industrial pitches. Knurling is ideal for enhancing manual grip on cylindrical components. To avoid custom tooling overhead and keep your production costs low, we advise sticking to standard imperial or metric knurling pitches whenever possible.
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.
