At RapidDirect, we recognize that producing high-quality parts is essential to your success. Our CNC machining experts are committed to delivering precision, efficiency, and consistent quality at every step of the production process.
Custom Online CNC
Machining Services
Get instant online quote for your metal or plastic CNC machined parts, from rapid prototyping to production.
- Tolerance down to 0.001 inches.
- Choose from 100+ materials, 60+ surface finishes.
- ISO 9001:2015, ISO 13485, ISO14001:2015, IATF 16949:2016 certified.
- Lead times as short as 1 day.
Start a New CNC Project!
Uploading
Drag and drop file or click to upload
STEP | STP | IGS | IGES | PRT | SLDPRT | SAT | X_T
Max. file size: ≤15MB
Max. file size: ≤15MB
Custom Online CNC Machining Services
Get instant online quote for your metal or plastic CNC machined parts, from rapid prototyping to production. Choose from 100+ materials, 60+ surface finishes. ISO 9001:2015, ISO 13485, ISO14001:2015, IATF 16949:2016 certified. Experience lead times as short as 1 day.
Start A New CNC Quote
STEP | STP | STL | IGS | IGES | PRT | SLDPRT | SAT | X_T
Max. file size: ≤15MB
Max. file size: ≤15MB
All uploads are secure and confidential.
CNC Machining Services for Custom Parts
RapidDirect is the go-to manufacturer for high-quality prototypes and end-use machined parts, whether simple or complex. We own 700+ CNC machines, offering milling, turning, routing, EDM machining, drilling, and precision grinding. Our ISO 9001 certification and expertise guarantee precision every time.
Custom CNC Milling Services
With 200+ milling centers, including 3-axis, 4-axis and advanced 5-axis CNC mills, we can easily handle tigh-tolerance parts and complex geometries in plastic and metal. Serving diverse industries and specializing in mold making.
Custom CNC Turning Services
With our CNC lathes, turning centers, and mill-turn machines, we can create cylindrical-shaped workpieces, also for square or hexagonal-shaped raw materials. Turned prototypes and production parts delivered in just a few days.
A Robust Network of
CNC Machine Shops
At RapidDirect, we operate a dedicated CNC machine shop alongside an extensive network of partner facilities across China. Our capabilities go beyond standard CNC machines, including grinders for smooth finishes, wire cutters for precision cuts, and EDM machines for intricate shapes. This diversity enables us to handle complex designs and create CNC-machined parts that meet specific requirements. Our expert machinists consistently achieve ultra-precise tolerances as tight as 0.01mm, ensuring perfect integration into larger assemblies.
We also leverage automated production lines, where machines seamlessly collaborate to deliver high-volume production efficiently while minimizing errors and keeping projects on track.
700+
Machines Set
120+
Countries Shipped
20,000+
Customers Served
CNC Machining Materials
From aluminum and steel to brass and plastics, we’ve got a wide selection of CNC materials for your custom parts.
CNC Machining Surface Finishes
Looking for the right finish? Choose from 20+ options to meet both your functional and aesthetic needs.
As machined finish leaves the surface straight from the CNC machine, providing a cost-effective option with tool marks.
Anodizing increases corrosion resistance and wear properties, while allowing for color dyeing, ideal for aluminum parts.
Polishing
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.
Heat treatment alters the mechanical properties of metal to increase its hardness, strength, or ductility.
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.
Electroplating bonds a thin metal layer onto parts, improving wear resistance, corrosion resistance, and surface conductivity.
Black oxidize is a conversion coating for ferrous metals that improves corrosion resistance and minimizes light reflection.
Tolerances for CNC Machining
Our CNC machines operate with precision tolerances that meet industry standards, ensuring that every part is consistently accurate and fits perfectly with other components.
| Description | |
|---|---|
| General Tolerances | Metals : ISO 2768-m Plastics : ISO 2768-c |
| Precision Tolerances | RapidDirect can manufacture and inspect parts with strict tolerances according to your drawing specifications and GD&T annotations, including tolerances tighter than +/- 0.001 inches. |
| Min Wall Thickness | 0.5mm |
| Min End Mill Size | 0.5mm |
| Min Drill Size | 1mm |
| Maximum Part Size | CNC Milling: 4000×1500×600 mm CNC Turning: 200×500 mm |
| Minimum Part Size | CNC Milling: 5×5 ×5 mm CNC Turning: 2×2 mm |
| Production Volume | Prototoyping: 1-100 pcs Low volume: 101-10,000 pcs High volume: Above 10,001 pcs |
| Lead Time | 5 bussiness days for most projects. Delivery of simple parts can be as fast as 1 day. |
Design Guidelines for CNC Machining
Optimize your designs for manufacturability with our helpful guidelines. Our experts provide feedback on your custom machined part for the best results in CNC machining.
| Description | |
|---|---|
| Radii | In CNC machining, sharp internal corners on a workpiece will naturally form rounded corners (radii). The depth must not exceed 12 times the diameter of the drill. For end mills, the depth must not exceed 10 times the diameter of the tool. |
| Threads and Tapped Holes | Diameter Φ 1.5-5 mm, depth: 3 times the diameter. Diameter Φ 5 mm or larger, depth: 4-6 times the diameter. RapidDirect can produce threads of any specification and size as required by the customer. |
| Undercuts | Square profiles, full radius, dovetail profiles. |
| Text | CNC Milling: Minimum width of 0.5 mm and depth of 0.1 mm. CNC Turning: RapidDirect can use laser marking to create standard text for CNC turned parts. RapidDirect can create standard text via CNC engraving or laser engraving as per customer requirements. |
CNC Machining Design Guide
This guide outlines key design considerations and guidelines to ensure the best results for CNC machined parts.
High-Quality CNC Machining, Every Time
We uphold a comprehensive quality control and assurance system throughout each phase of CNC machining, whether your project requires simple or complex components in small or large quantities. Every part implement strict inspection using advanced equipment such as CMM, two-dimensional measuring tools, XRF analyzers, gauges, micrometers, and calipers.
Our team is dedicated to ensuring dimensional accuracy and functionality, inspecting both prototypes and final products. Should any discrepancies arise, we take immediate corrective actions to uphold our high-quality standards.
With extensive experience and ISO 9001 certification, we consistently meet the stringent quality expectations of today’s competitive manufacturing environment.
- 20+ inspection equipment
- 30+ quality engineers
- ISO 9001:2015, ISO 13485, ISO 14001, and IATF 16949
RapidDirect CNC Machining Solutions
Rapid Prototyping
Accelerate product development with our rapid machining services. We offer fast turnaround times and specialize in quick production of high-quality prototypes and mold tooling, aiding your design verification process.
Low and High-Volume Production
Whether you need small batches or large-scale production, we can offer you both. With stringent tolerance controls and comprehensive capabilities, we adapt to your volume requirements without compromising on quality.
A Robust Network of CNC Machine Shops
CNC machining begins with a computer design of a part. Machines then precisely remove material to turn the design into a real machined part. This cutting can be done from different angles using machines that have 3, 4, or 5 moving parts, known as axes.
At RapidDirect, we have our own main CNC machine shop and a broad network of partner shops throughout China. Our facilities aren’t limited to just basic CNC machines. We also have grinders for smoothing surfaces, wire cutters for precise cuts, and EDM machines for detailed shapes. This variety allows us to tackle complex designs that produce unique CNC machined parts with specific requirements. Our skilled machinists work with exceptional accuracy, achieving tolerances as precise as 0.01mm. This level of detail is crucial for components that must fit perfectly into larger assemblies.
We also use automated production lines. These are setups where machines work together smoothly and quickly, which helps us produce large quantities faster and reduces the chance of errors. This efficiency means we can deliver quality machined parts quickly to meet our clients’ needs, keeping projects on schedule.
700+
Sets of Machine
120+
Countries Shipped
20,000+
Customers Served
RapidDirect CNC Machining Solutions
Whether you’re creating a small batch of custom parts or scaling up for high-volume production, RapidDirect custom CNC machining services offer the flexibility you need.
Rapid Prototyping
CNC rapid prototype machining is perfect for creating engineering or production prototypes that closely resemble the final product in both appearance and functionality. At RapidDirect, we offer instant quotes and fast delivery, providing you with precise, high-quality CNC machined prototypes for your needs.
- Lead Time: 1-5 business days
- Capability: 1-100 pcs
- Get 20% off the price
Low Volume Manufacturing
Low volume CNC machining often acts as a bridge between prototyping and mass production for new and emerging production. With RapidDirect, this process becomes easier, more efficient, and cost-effective, allowing you to scale production quickly while maintaining high-quality standards.
- Lead Time: 5-15 business days
- Capability: 101-10,000 pcs
- Meet tight specifications
End-use Production
CNC production machining is the best solution for producing a thousand parts or more efficiently. Leveraging a diverse selection of materials and automation and multi-axis capabilities, RapidDirect delivers high-volume production with tight tolerances, superior dimensional accuracy, high reliability and fast turnaround times.
- Lead Time: 2-4 weeks
- Capability: Above 10,001 pcs
- Consistent Quality
Start Your CNC Machining Project
Upload your CAD file to get instant quotes, lead times, and DFM feedback. Various materials, flexible production, and shipping options available. Get started.
CNC Machining for Various Industries
From automotive to aerospace, RapidDirect’s CNC machining meets the precise needs of diverse industries. We work with independent inventors, designers, and large-scale companies, serving over 20,000 customers worldwide.
Success Stories of
CNC Machining Projects
Case Study: RapidDirect Powers Arco Aria’s Tether Car Success
LURA, the Leeds University Rocket Association, used RapidDirect's 5-axis CNC machining and turn-mill compounding techniques to create intricate engine parts essential for their victory in the National Race to Space Propulsion Competition.
RapidDirect × Sylphaero: A Partnership for Sustainable Plasma Jet Engine
Sylphaero aims to revolutionize aviation with sustainable electric plasma jet engines, focusing on decarbonization. RapidDirect provides crucial precision machining support, highlighting the importance of innovation and strategic partnerships in the sector.
RapidDirect x Rennteam Stuttgart: Innovation Collaboration of Racecar Engineering
RapidDirect proudly supports Rennteam Stuttgart by manufacturing 2 mainbar components and over 80 Aluminum inserts. Our precision engineering ensures they're ready to conquer the Formula Student competitions, giving the team a winning edge.
Case Study: LURA’s Partnership with RapidDirect for Precision Rocket Engine Parts
LURA, the Leeds University Rocket Association, used RapidDirect's 5-axis CNC machining and turn-mill compounding techniques to create intricate engine parts essential for their victory in the National Race to Space Propulsion Competition.
Case Study: RapidDirect and Evoskil Collaboration for Ultralight Wheel Kits
Evoskil, specializing in ultralight aircraft upgrade kits, collaborates with RapidDirect to meet aerospace's rigorous standards and overcome innovation challenges, exemplifying the power of strategic partnerships.
Case Study: The Collaboration of openQCM and RapidDirect in Quartz Crystal Microbalance
The openQCM project is centered around the Quartz Crystal Microbalance (QCM), an extremely sensitive weighing device that can measure mass variations at the nanogram or even picogram scale.
Why Choose Us
/01
High Quality Parts
Our ISO-certified CNC machining ensures precision and quality. Every part is made to fit perfectly and perform flawlessly with advanced quality control at every step.
/02
Fast Lead Time
Keep your projects moving with RapidDirect. Our local workshops and advanced equipment provide quick turnarounds to meet your deadlines.
/03
Engineering Support
Count on us anytime, anywhere for your CNC machining needs. Our specialists provide support to maximize design efficiency and quality.
Ultimate Guide to CNC Machining
CNC Machining FAQs
CNC machining has a wide range of applications across industries.
- In the automotive and aerospace sectors, it is used to fabricate precise engine components, structural parts, and other intricate elements.
- The medical industry leverages CNC for manufacturing devices, implants, and surgical instruments.
- CNC is also crucial in electronics, enabling the production of electronic housings, circuit boards, and connectors.
- Machine tool makers rely on CNC to create complex molds, dies, and machine components. Additionally,
- CNC is valuable for general custom part production, prototyping, woodworking, and more, allowing for consistent quality and high precision.
Advantages of CNC Machining
- Precision and Repeatability: CNC machining ensures high precision and consistent replication of parts, crucial for complex designs with tight tolerances.
- Reduced Human Error: The automated nature of CNC machining minimizes human error, enhancing the overall quality of production.
- Efficiency and Speed: Automation allows for faster production cycles, enabling quicker turnaround times than manual processes.
- Material Flexibility: CNC machines can work with a diverse range of materials, including metals, plastics, and composites, offering versatility across various applications.
- Software Integration: Advanced CNC software supports quick design changes and updates, facilitating rapid prototyping and easy customization.
- Cost-Effective for Large Runs: While setup costs are higher, per-unit costs decrease significantly with larger production volumes, making it cost-effective for mass production.
Disadvantages of CNC Machining
- High Initial Costs: CNC machinery and its maintenance represent significant investments, making initial setup expensive, especially for small-scale operations.
- Skill Requirements: Operating CNC machines requires highly skilled personnel, which can increase training costs and limit accessibility.
- Less Cost-Effective for Small Runs: Due to setup and programming time, CNC machining may not be economical for producing small quantities of parts.
- Material Waste: CNC machining often involves subtractive processes, leading to more material waste compared to additive manufacturing.
- Limited to Material Hardness: Extremely hard materials can wear out CNC tools quickly, potentially increasing operational costs and downtime.
Manufacturing Process: 3D printing is an additive process, building parts layer by layer from materials like plastic or metal. In contrast, CNC machining is subtractive, cutting away material from a solid block to shape the final product.
Material Efficiency: 3D printing minimizes waste by using only the material needed to form the part, whereas CNC machining can produce more waste due to its subtractive nature.
Speed and Cost: For small batches and complex geometries, 3D printing can be faster and more cost-effective. CNC machining is preferable for larger volumes and materials requiring high precision and strength.
Surface Finish and Tolerances: CNC machining typically achieves better surface finishes and tighter tolerances compared to 3D printing.
John T. Parsons is often credited as the father of CNC machining. In the late 1940s, Parsons developed the first numerical control techniques and applied them to the production of helicopter rotor blades. Working alongside engineer Frank L. Stulen, Parsons conceptualized the method of using punched tape to guide machine tools. This innovation laid the groundwork for the development of CNC (Computer Numerical Control) technology. Their pioneering work eventually led to the creation of the first CNC machines in the 1950s, which revolutionized manufacturing by improving the precision, efficiency, and repeatability of machining processes.
G and M codes are the programming languages used in CNC machining to control CNC machine tools. G-codes are primarily used for specifying the movements of the machine, such as linear interpolation, circular movements, and other specific functions related to the actual path of the tool. M-codes, on the other hand, handle machine functions that are not directly related to the path of the tool, such as turning the machine on or off, starting or stopping the spindle, and controlling coolant. Together, G and M codes provide a comprehensive set of instructions that CNC machines follow to produce parts accurately and efficiently.
CNC machining is renowned for its ability to achieve high precision and tight tolerances, essential for complex and detailed parts. Typically, standard CNC machining can maintain tolerances within ±0.01 inches (±0.127 mm). RapidDirect defaults to standardized tolerances without special requirements. For even more precise requirements, advanced CNC machines can achieve tolerances as tight as ±0.0005 inches (±0.0127 mm) under optimal conditions. The achievable tolerance depends on several factors including the material, part geometry, size, and the specific type of CNC machine used. This capability makes CNC machining a preferred choice for industries that require highly accurate components, such as aerospace, medical, and automotive sectors.
A machining center is a highly advanced CNC machine designed to handle a variety of machining tasks including milling, drilling, and tapping, all within a single setup. This integration enhances efficiency and accuracy by reducing the need to transfer parts between different machines. Machining centers are equipped with a tool turret or magazine that holds multiple tool options, enabling automatic tool changing under CNC control. This capability allows for rapid switching between operations, optimizing production flow. Typically, machining centers are used for complex parts that require precision machining from multiple angles, making them indispensable in modern manufacturing environments.
Certainly! At RapidDirect, we have the capacity to manufacture over 10,000 diverse prototypes each month, ranging from straightforward to complex designs. Our production capabilities are supported by more than 200 state-of-the-art CNC machines. We also take pride in our team of over 100 skilled technical experts who ensure precision and quality in every project. This extensive infrastructure allows us to meet large-scale demands efficiently, making us a reliable partner for all your CNC machining needs. Whether your project is big or small, our resources are geared to deliver with excellence.
The expense associated with our CNC machining service is variable and directly influenced by the distinct attributes of your project, including its design and tolerance specifications. The machining duration for the chosen material is another key determinant of the cost. To illustrate, should you require a part where the combined machining and material expense is $2, with an additional setup charge of $200, the total cost for a singular part would amount to $202. Contrastingly, should you commission the production of 200 identical parts, the cost per unit would be just $3! Learn more about the CNC machining costs.
At RapidDirect, we understand the diverse needs of our customers, ranging from single prototypes to large-scale production runs. Consequently, we do not enforce a strict minimum order quantity (MOQ). Whether you require just one machined part or thousands, we are equipped and ready to provide tailored solutions that meet your specific requirements. Our flexible approach ensures that all clients, regardless of order size, receive the highest level of service and quality.
The lead time for receiving a CNC machined part from RapidDirect can vary depending on several factors including the complexity of the part’s design, the type of material selected, and our current production schedule. CNC machining is known for its speed, particularly for less complex parts, allowing for quick turnaround times. In fact, parts can be delivered in as fast as just one day after the machining setup is complete! However, for the most accurate time estimate tailored to your specific project, we recommend contacting us directly for a detailed quote. This way, we can provide you with a precise timeframe based on your unique requirements.
CNC Machining Resources
Try RapidDirect
now, for free
now, for free