CNC turning services

CNC Turning With Zhonghui
Take advantage of the on-demand CNC turning service and get reliable metal and plastic turned parts for your unique projects. With advanced technologies and expert technicians, Zhonghui produces high-quality custom prototypes and end-use production parts. Our CNC turning capabilities allow us to deliver turned parts with high accuracy, regardless of the complexity. You will get durable parts from flats to radial and axial holes, slots, and grooves as fast as one day. Our precision CNC turning lathes provide low-cost parts for simple and complex cylindrical geometries. We also use Live tooling to create precise, complex geometries for features like axial and radial holes, grooves, slots, and flats. Full automation of these versatile machines allows us to produce hundreds of similar dimensions easier, faster, and cost-effectively.
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How Does CNC Turning Work?
CNC turning is a manufacturing process that uses computer-controlled lathes to precisely shape material into cylindrical parts. Initially, the design of the part is created using CAD software and converted into instructions for the CNC machine using CAM software. During setup, the correct cutting tools are installed, and a cylindrical workpiece is secured in the machine’s chuck, which holds and rotates the material. As the machine operates, the workpiece spins at high speeds while the cutting tools move along various axes to carve, cut, and shape the material based on the program’s specifications. Operations such as facing, threading, knurling, and drilling are performed during this stage. A coolant is often applied to prevent overheating and to wash away debris. After machining, the part may undergo additional finishing processes like sanding or polishing. The final step involves a thorough inspection to ensure the part meets all the required dimensions and tolerances. This process allows for high precision and repeatability, making CNC turning ideal for producing complex parts efficiently.
Get QuoteAdvantages of CNC Turning- CNC turning offers several distinct advantages that make it a preferred method for manufacturing precise cylindrical parts. Here are some of the key benefits: | Applications of CNC Turning- CNC turning is adept at producing a variety of precision components, often used in mechanisms where accuracy and fit are critical. Here’s an overview of some typical parts made through this process: |
Precision and Accuracy: Machines are capable of achieving extremely tight tolerances, essential for components that must fit seamlessly into complex assemblies. | Shafts are fundamental in various machines, serving as axes or pivots. Precision in diameter and surface finish is crucial for their interaction with other mechanical parts. |
Efficiency: Once programmed and set up, these machines produce parts quickly and with consistent quality, often requiring minimal supervision, which accelerates production cycles. | Flanges connect pipes, pumps, or valves, requiring accurate machining to ensure a secure fit and avoid leaks. |
Flexibility: The ability to reprogram the machines for different designs quickly makes them highly adaptable to varying production needs, enhancing operational responsiveness. | Bushings and Sleeves provide smooth surfaces for other parts to move against or through, necessitating exact internal diameters and smooth finishes. |
Repeatable: The automated nature ensures that each part is identical, even across large production volumes, crucial for maintaining quality in mass production. | Pins are small but vital for aligning or holding components together, often needing precise dimensions to fit snugly into place. |
Reduced Labor Costs: Automation reduces the need for manual intervention, cutting labor costs and minimizing human error, thereby enhancing overall efficiency and cost-effectiveness. | Knobs and Dials are user interface elements for machinery and electronic devices, where aesthetics and precise dimensions enhance usability. |
Material Versatility: The machines handle a wide range of materials, from various metals to plastics and composites, accommodating diverse manufacturing demands. | Wheels and Rollers are integral to systems like conveyors, where consistent shape and smoothness reduce friction and wear. |
Improved Safety: The enclosed, automated operation minimizes human interaction, reducing the risk of accidents and promoting a safer workplace. |
CNC Turning solutions
CNC Turning Materials
Metals |
Characteristics |
Model |
Aluminum | lightweight yet strong, with excellent machinability and corrosion resistance. Ideal for aerospace and automotive parts. | 6061,6061-T6,2024,5052,5083, 6063,6082,7075,7075-T6,ADC12 (A380),A356 |
Copper | superior electrical conductivity and thermal properties, making it perfect for electrical components and heat exchangers. | Copper C101(T2), C103(T1), C103(TU2), C110(TU0), Beryllium Copper. |
Brass | Brass is durable and has a low friction coefficient, which makes it suitable for fittings, tools, and musical instruments that require precision. | Brass C27400, Brass C28000, Brass C36000 |
Bronze | Bronze is highly resistant to corrosion and metal fatigue, favored for bearings, bushings, and marine hardware. | Tin Bronze |
Steel | Steel is an alloy with high tensile strength and durability, commonly used in construction and automotive industries for its robustness. | Steel 1018, 1020, 1025, 1045, 1215, 4130, 4140, 4340, 5140, A36,Die steel, Alloy steel, Chisel tool steel, Spring steel, High speed steel, Cold rolled steel, Bearing steel, SPCC. |
Stainless steel | Stainless steel is renowned for its corrosion resistance, making it a prime choice for medical devices and food processing equipment. | Stainless Steel SUS201, SUS303, SUS 304, SUS316, SUS316L, SUS420, SUS430, SUS431, SUS440C, SUS630/17-4PH, AISI 304 |
Magnesium | Magnesium is the lightest structural metal, offering high strength-to-weight ratios, perfect for automotive and aerospace applications where weight is critical. | Magnesium Alloy AZ31B, Magnesium Alloy AZ91D |
Titanium | Titanium boasts the highest strength-to-density ratio among metals, highly resistant to corrosion and fatigue, ideal for aerospace, medical, and marine applications. | Titanium Alloy TA1, TA2, TC4/Ti-6Al 4V |
ABS | ABS is strong, durable, and offers good resistance to heat and impact. It’s preferred for automotive components and consumer goods. | ABS Beige(Natural), ABS Black, ABS Black Antistatic, ABS Milky White, ABS+PC Black, ABS+PC White |
Polycarbonate | Polycarbonate is extremely durable and has high impact resistance, along with excellent clarity, used for bullet-proof glass and protective gear. | PC Black, PC Transparent, PC White, PC Yellowish White, PC+GF30 Black |
PMMA | PMMA, or acrylic, is known for its crystal clarity and weather resistance, making it ideal for outdoor fixtures and display cases. | PMMA Black, PMMA Transparent, PMMA White |
POM | POM is strong, with a low friction surface and good dimensional stability, perfect for precision parts in mechanical applications. | Dark brown (coffee) POM 100AF, POM Black, POM Blue, POM White |
Nylon | Nylon is versatile, strong, and wears well against friction, commonly used for gears, bearings, and other wear-resistant surfaces. | PA(Nylon) Blue, PA6 (Nylon)+GF15 Black, PA6 (Nylon)+GF30 Black, PA66 (Nylon) Beige(Natural), PA66 (Nylon) Black |
Polyethylene | Polyethylene is lightweight and has high resistance to impact, widely used in packaging and containers. | PE Black, PE White |
PEEK | PEEK is renowned for its high temperature resistance and strength, often used in aerospace and medical implant manufacturing. | PEEK Beige(Natural),PEEK Black |
Polypropylene | Polypropylene is tough, has excellent chemical resistance, and is used for automotive parts, containers, and in packaging. | PP Black, PP White, PP+GF30 Black |
HDPE | HDPE is known for its high strength-to-density ratio, resistance to impacts, and is used in making bottles and corrosion-resistant piping. | HDPE Black, HDPE White |
HIPS | HIPS is easy to machine and offers good dimensional stability and impact resistance, suitable for prototyping and modeling. | HIPS Board White |
LDPE | LDPE is soft, flexible, and used in applications where heat sealing is required, such as in tubing and plastic bags. | LDPE White |
PBT | PBT is a strong, rigid plastic that is heat resistant and commonly used in electrical components and casings. | PBT Black, PBT Milky White(Natural) |
PVC | PVC is robust, cheap, and has good chemical resistance, used in plumbing, medical devices, and cables. | PVC Grey |
PET | PET is strong, resistant to moisture and chemicals, and widely used in food containers and textile fibers. | PET Black, White, PET+GF30 Black, PET+GF30 White |
CNC Turning Surface Finishes
With a wide selection of surface finishes, RapiDirect can help improve the surface qualities of your products. Surface finishes applied to your CNC turned parts aim at improving their appearance, surface hardness and roughness, chemical and corrosion resistance, etc. They also help hide any visible tool marks from areas cut with live tooling. Here are some of your top choices.

As machined finish leaves the surface straight from the CNC machine, providing a cost-effective option with tool marks.


Polishing achieves a high gloss finish, reducing surface roughness and enhancing the aesthetic appeal of metals.

Sand blasting uses pressurized sand or other media to clean and texture the surface, creating a uniform, matte finish.

Tumbling smooths and polishes small parts by friction and abrasion in a barrel, offering a consistent but slightly textured finish.

Electropolish is a chemical process that smooths and brightens surfaces while improving corrosion resistance.


Alodine coating provides corrosion protection and improves paint adhesion, mainly used on aluminum surfaces.

A brushed finish creates a unidirectional satin texture, reducing the visibility of marks and scratches on the surface.

Powder coating applies a thick, wear-resistant layer with excellent color and texture options, suitable for a variety of surfaces.


Black oxidize is a conversion coating for ferrous metals that improves corrosion resistance and minimizes light reflection.
Tolerances for CNC Turning
As an ISO 9001 certified company, we machine CNC turning lathe parts to meet tight tolerance requirements. Based on your design, our CNC lattes can reach tolerances of up to ±0.005”. Our standard tolerances for CNC milled metals is ISO 2768-m and ISO 2768-c for plastics.
Description | |
Maximum Part Size | Typically up to 500 mm in diameter and 1500 mm in length, though larger sizes can be accommodated with specific equipment. |
Minimum Part Size | As small as 1 mm in diameter, depending on the material and machining setup. |
General Tolerances | Standard tolerances of ±0.01 mm; tighter tolerances down to ±0.005 mm can be achieved based on the material and complexity of the part. |
Lead Time | Standard lead times range from 5-10 days for small batches. |