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Tenghui provides high-precision CNC milling services with highly competitive pricing. Equipped with advanced 3-axis, 4-axis, and 5-axis milling centers, we deliver consistent quality, tight tolerances, and rapid turnarounds for both custom prototypes and large production runs.
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From rapid functional prototypes to complex high-volume components, our advanced vertical and horizontal milling setups bring your 3D CAD designs to life. We utilize high-speed multi-axis machinery to process a wide range of geometries and part sizes while consistently maintaining extreme dimensional accuracy and fast turnaround times.
CNC milling tolerances specify the allowable deviation between your 3D CAD design dimensions and the actual machined component. Achieving tighter tolerances ensures higher precision and flawless assembly fits, though it requires specialized multi-axis toolpath optimization and rigorous inspection.
| Machine Type | Typical Tolerance (Metric) | Typical Tolerance (Imperial) | Precision Level | Common Applications |
|---|---|---|---|---|
| 3-Axis CNC | ±0.1 mm to ±0.025 mm | ±0.004" to ±0.001" | Standard to Medium | Flat surfaces, simple 2D contours, mounting brackets, and basic enclosures. |
| 4-Axis CNC | ±0.05 mm to ±0.01 mm | ±0.002" to ±0.0004" | Medium to High | Rotational components, industrial gears, shafts, and parts with side-wall features. |
| 5-Axis CNC | ±0.01 mm to ±0.0025 mm | ±0.0004" to ±0.0001" | High to Ultra-Precision | Complex 3D organic surfaces, aerospace structures, medical implants, and automotive racing parts. |
Review our recommended design guidelines to optimize your parts for seamless CNC production. By aligning your 3D models with these manufacturing best practices, you can significantly reduce cycle times, prevent machining errors, and lower overall production costs.
| Design Feature | Design Recommendation | Engineering Best Practices |
|---|---|---|
| Minimum Wall Thickness | Metal: ≥ 0.8 mm Plastic: ≥ 1.5 mm |
Thin walls are prone to severe vibration, chattering, or warping due to cutting forces during machining. |
| Minimum Hole Diameter | ≥ 1.0 mm (Standard drill bit sizes preferred) | Avoid micro-holes unless absolutely necessary. Standard tool sizes ensure faster cycle times and eliminate micro-tool breakage risks. |
| Hole Depth | ≤ 4x Hole Diameter | Deeper holes lead to poor chip evacuation and require specialized deep-hole drilling operations or custom tooling. |
| Pocket Depth | ≤ 4x Tool Diameter | Deep, narrow internal pockets significantly increase machining time, risk tool deflection, and may reduce surface finish accuracy. |
| Internal Radii | ≥ 1.0 mm (Or match tool radius) | Sharp 90-degree internal corners cannot be milled by rotating tools. Use corner fillets that match or exceed the cutter radius. |
| Text & Engraving | Font Size: ≥ 5 mm Depth: ≥ 0.3 mm |
Use clean, sans-serif fonts (like Arial or Calibri). Shallow engravings prevent legibility loss and resist rapid surface wear. |
| Tolerances | Standard: ±0.1 mm (Unless specified tighter) | Tightening tolerances unnecessarily will drastically increase manufacturing complexity, inspection protocols, and costs. |
| Undercuts | Avoid if possible (Or design for standard T-slot/lollipop cutters) | Undercuts complicate tool access. Always discuss part geometries with our engineering team if undercuts are mandatory. |
| Threaded Holes | ≥ M3 (Or UNC #4) preferred | Extremely small threads are difficult to tap precisely and are prone to thread stripping or tap breakage during processing. |
| Maximum Part Size | Typical limit: 1000 x 500 mm | Oversized parts require heavy-duty machining centers, custom large-scale workholding setups, and special handling. |
| Part Orientation | Minimize reorientation | Consolidate complex geometric features into fewer setups to maintain tight part tolerances and reduce manual labor overhead. |
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) milling is a precise subtractive manufacturing process that uses computer software to control high-speed rotating cutters. The machine automatically removes material from a solid block according to your 3D CAD design. By moving the cutting tool across multiple axes (3, 4, or 5 axes), it can turn raw metals or plastics into highly complex custom parts with extreme accuracy.
The cost of your CNC milled parts is mainly driven by three factors: material choice, geometric complexity, and machining time. Specialized metals like Titanium cost much more to process than standard Aluminum 6061. To significantly lower your project costs, you should minimize the number of part rotations needed, avoid ultra-deep pockets, and only request super-tight tolerances where they are functionally necessary.
High-precision milling requires strict quality control to prevent common manufacturing defects. Problems like part warping from material stress, cutter chatter marks, and tool deflection inside deep cavities can ruin a component. Tenghui prevents these issues through real-time toolpath tracking, custom structural workholding fixtures, and by only sourcing certified raw materials from verified mills.
Choosing Tenghui means working with a direct source manufacturer. Equipped with 60+ high-speed milling machines (up to simultaneous 5-axis), we guarantee tight tolerances down to ±0.01 mm, rapid 3-to-7 day lead times, and certified material traceability. Our team provides free manual DFM design reviews within 24 hours and manages everything from rapid NPI prototyping to turnkey post-surface finishes under one single roof.
Our vertical and horizontal CNC milling centers can accommodate maximum part dimensions up to 1000 mm x 500 mm x 500 mm. For oversized components or heavy workpieces requiring specialized setups, please contact our engineering team directly with your 3D CAD files to verify fixture and axis clearance.
Yes, we regularly machine thin-walled enclosures and brackets. Our recommended minimum wall thickness is 0.8 mm for metals (such as Aluminum 6061) and 1.5 mm for engineering plastics. While thinner walls are achievable depending on part geometry, they increase the risk of tool chatter and part warping.
Since milling uses rotating cylindrical tools, perfectly sharp 90-degree internal corners cannot be directly machined. We recommend adding a corner radius (fillet) of at least 1.0 mm or matching your tool radius. For deep pockets, we limit the depth to 4x the tool diameter to prevent tool deflection and ensure a smooth surface finish.
The fundamental difference lies in which part rotates during machining. In CNC milling, the raw material remains stationary while the cutting tool rotates at high speeds to carve out shapes. This is ideal for square, flat, or highly irregular parts with complex organic features. In CNC turning, the raw material blocks are clamped into a chuck and rotate at high speeds while a stationary cutting tool strips away material. This is the optimal, most cost-effective choice for producing cylindrical, rounded, or symmetrical parts such as shafts, pins, bushings, and fasteners.
Our simultaneous 5-axis linkage milling allows the cutting tool to approach the workpiece from five different angles in a single setup. This eliminates the need for multiple manual repositioning, drastically reduces tooling errors, ensures superior geometric tolerances, and allows us to easily machine complex organic curves and deep undercuts.
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.
