Looking for low-cost CNC milling parts with unparalleled quality? Junying Metal Manufacturing Co., Limited is a professional CNC company in China that provides precision CNC milling services supported by advanced 3-axis to 5-axis machines and highly skilled machinists. Our experienced operators, proficient in CAD and CAM programming, consistently optimize processes to deliver top-tier CNC milled parts and components tailored to client requirements.
Backed by robust technical capabilities and years of industry experience, we provide high-quality yet cost-effective custom prototypes and high-volume milling part production with soft/hard metals and plastics. Our rapid CNC milling solutions cater to diverse sectors including locksets, automotive, machinery, defense, medical, aerospace, electronics, military and more OEM parts machining. Upload your part drawing or inquiry now to get an instant online CNC milling quote.
Junying (CNClathing.com) is capable of providing cost-effective CNC milling machine services and quality products with high precision, fast turnaround and more advantages for vast projects.
One-on-one rapid quotation with no hidden costs. No premium for small batches, and discounts are available for large batches. Your budget is fully controllable.
Supported by a full set of quality inspection equipment like CMM, parts feature precise dimensions and strictly controlled tolerances. Each product undergoes multiple inspections.
Over 50 types of metals and plastics to choose from, matched with more than 10 surface processes. Everything from material to look meets your needs.
Urgent prototypes are processed quickly, and large-batch production is stable. Production capacity adapts to order scale, and delivery is always on time as promised.
To reduce manufacturing time and save costs, here are the standard design considerations and tolerances for CNC milling. For custom requirements, please contact us or request a quote.
Supports UNC/UNF threads from #2 up to 0.5 inch, and Metric threads from M2 to M12.
Note: Do not model internal threads directly in your part design.
Sharp inside corners will be naturally radiused during the CNC machining process, with the resulting radii matching the minimum allowable tool radius.
+/- 0.025mm
+/- 0.001 inches
+/- 0.025mm
+/- 0.001 inches
+/- 0.025mm
+/- 0.001 inches
950×550×480mm
37.0×21.5×18.5 inches
| CNC Machining Standards (DIN ISO 2768-1(1991-06) | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tolerance class | tolerance(mm) | |||||||||||||
| Metal (ISO 2768-F) | Plastic (ISO 2768-F) | |||||||||||||
| 0.5 to 3 | Over 3 to 6 | Over 6 to 30 | Over 30 to 120 | Over 120 to 400 | Over 400 to 1000 | Over 1000 to 2000 | 0.5 to 3 | Over 3 to 6 | Over 6 to 30 | Over 30 to 120 | Over 120 to 400 | Over 400 to 1000 | Over 1000 to 2000 | |
| F | ±0.05 | ±0.05 | ±0.1 | ±0.15 | ±0.2 | ±0.3 | ±0.5 | ±0.05 | ±0.05 | ±0.1 | ±0.15 | ±0.2 | ±0.3 | ±0.5 |
| General tolerances for shape and position (DIN ISO 2768-2(1991-04) | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tolerance class | tolerance(mm) | ||||||||||||||
| Straightness and Flatness | Verticality | Symmetry | |||||||||||||
| 10 | 10 to 30 | 30 to 100 | 100 to 300 | 300 to 1000 | 1000 to 3000 | to 100 | 100 to 300 | 300 to 1000 | 1000 to 3000 | to 100 | 100 to 300 | 300 to 1000 | 1000 to 3000 | ||
| H | ±0.02 | ±0.05 | ±0.1 | ±0.2 | ±0.3 | ±0.4 | ±0.2 | ±0.3 | ±0.4 | ±0.5 | ±0.5 | ||||
A CNC milling center or CNC mill can perform different operations based on the number of axes.
The most basic type of milling operation, using three axes of motion, including X, Y, and Z, to machine a workpiece. 3-axis CNC milling is one of the most widely used manufacturing techniques for mechanical parts.
Applications: Flat surfaces, simple contours, holes, and other relatively simple part geometries.
A rotary table is added to the CNC machine, allowing the workpiece to be rotated around a fourth axis. This enables the milling of complex shapes and contours on the workpiece.
Applications: Cylindrical parts, helices, gears, cams, and components with angular or rotational features.
A type of 5-axis machining, the machine has two additional axes of motion, typically a rotary axis (A) and a tilting axis (B). This allows the tool to approach the workpiece from multiple angles, enabling highly complex shapes with high precision and tolerance control requirements.
Applications: Complex freeform surfaces, impellers, turbine blades, aerospace structural parts, and more.
Create a CAD model of the part that complies with milling requirements, including machining allowances and avoiding undercut features, to ensure smooth programming and avoid manufacturing issues later.
Generate G-code using CAM software, adjusting parameters such as cutting speed and feed rate based on the specific machine model, tool type, and material properties for optimal machining.
Prepare the machine by installing cutting tools and fixtures, verifying workpiece positioning and clamping accuracy, and setting tool length compensation to ensure machining precision.
Execute the machining program, performing first-piece inspection to verify dimensions and quality before proceeding to batch production, minimizing scrap and ensuring consistent results.
After the CNC milling, we are also going to complete the required finishing operations and quality inspections to ensure product quality before shipment.
CNC milling service can be applied to a wide variety of materials, including metal, plastic, and wood. Different milling are needed for milling metal and wood. According to the types of machined part materials, certain maintenance and safety precautions may be required for the milling. Here are some common materials for CNC milling manufacturers below. If the material you required is not listed in the table, please contact us.
| Material | Available Types & Grades |
|---|---|
| Aluminum |
Aluminum 2024 Aluminum 5052 Aluminum 5083 Aluminum 6063 Aluminum 6061 Aluminum 6082 Aluminum 7050 Aluminum 7075 |
| Brass/Bronze |
Brass C360 Brass 260 C932 M07 Bearing Bronze |
| Copper |
Copper C110 Copper 101 |
| Steel |
Alloy Steel 4130 Alloy Steel 4140 Mild Steel 1018 Mild Steel A36 |
| Stainless Steel |
Stainless Steel 17-4 Stainless Steel 18-8 Stainless Steel 303 Stainless Steel 304/304L Stainless Steel 316/316L Stainless Steel 416 Stainless Steel 420 |
| Titanium |
Titanium Grade 2 Titanium Grade 5 |
| Plastics |
ABS Nylon POM PEEK PMMA PTFE Polystyrene Polyethylene Polycarbonate |
A variety of metal surface finishing services are available at Junying for post-machining the milled components, click here to get a quick quote.
| Surface Finish | Description |
|---|---|
| As machined | Standard finish with a surface roughness of 1.6 μm (126 μin). |
| Smoothing | The standard smoothing surface roughness (Ra) is 0.8 μm (63 μin). |
| Painting | Spraying paint, pigment, or color to a solid surface as a colored protective layer. |
| Passivation | Remove ferrous contaminants or use a light coat of protective material to create a shell. |
| Powder Coating | A functional and decorative finish that is applied as a free-flowing, dry powder. |
| Anodizing | Type II (anodizing color or clear) or Type III (anodizing hard coat) |
| Polishing | Produce a smooth and shiny surface. |
| Black Oxide | Forming a black conversion coating on metal parts. |
| Bead Blasting | Removing surface deposits by applying fine glass beads at a high pressure. |
| Abrasive Blasting/Sandblasting | Smoothing and cleaning a hard surface by forcing solid particles across that surface. |
| Electroplating/Plating | Form a thin coherent metal coating on an electrode. |
| Brushing | Polishing the metal with grit resulting in a unidirectional satin finish. |
| Chromate Conversion Coating | Increase the corrosion resistance while maintaining conductive properties. |
If you need unconventional materials and custom surface treatment, please contact us.
Contact UsJunying is a CNC milling company specializing in high-precision small part manufacturing for mass production, catering to industries including cell phones, medical, automobile, aerospace, military, marine, etc. As one of the most fundamental, versatile, and critical technologies in mechanical manufacturing, CNC milling directly impacts production efficiency, cost control, energy consumption, and environmental sustainability, which makes it indispensable across diverse sectors. Industries demanding uncompromising accuracy, such as aerospace (for Inconel alloy components and steering systems), automotive (for engines and gears), and medical (for surgical instruments and orthopaedic implants), rely heavily on its capabilities. Beyond industrial use, CNC milling services extend to electronics (motherboards and precision hardware), energy (nuclear, oil & gas, and renewable energy components), agriculture (equipment parts), defense (weapon components), and even non-industrial fields like woodworking, jewellery making, and arts & crafts.
Tight Tolerance Control: Deliver custom milling parts with +/-0.001″–0.005″ precision, fully aligned with your design specs.
Quick-Turn Prototyping: Utilize 3/4/5-axis milling machines for fast, functional prototypes of complex geometries.
Industry-Versed Expertise: Our seasoned technicians serve global clients across diverse sectors with reliable precision machining.
Plane: CNC milling machines can be used to process various planes, including straight lines, arcs and various complex shapes.
Cam: The cam is a common part in machinery, and the CNC milling machine can be used to process various shapes of the cam.
Thread: CNC milling machines can be used to process a variety of threads, including precision threads and special-shaped threads.
Holes: CNC milling machines can be used to process holes of various shapes and sizes, including straight through holes, blind holes, inclined holes, etc.
Curved surfaces: CNC milling machines can be used to process various complex curved surfaces, including spherical surfaces, rotating surfaces and free-form surfaces.
Gears: CNC milling machines can be used to process various gears, including spur gears, helical gears, arc gears, etc.
In short, CNC milling machines can be used to process parts of various shapes and sizes, and have the advantages of high precision, high production efficiency, and stable machining accuracy.
Turning operations are performed by rotating the workpiece and using a stationary cutting tool, and milling operations are performed by rotating the cutting tool and leaving the workpiece locked in place.
The most common materials used in CNC milling are metals such as brass, Titanium, aluminium or steel, and plastics such as PVC, ABS, polycarbonate and polypropylene.
In short, tolerances are measurements that signify the level of precision needed for a part that you want to manufacture. Specifically, machining tolerances indicate the degree of variation permitted in a part’s final dimensions or measured value.
Due to the spinning motion produced by the CNC milling machine’s cutter, the surface finish of CNC machined parts will have visible toolmarks. If you require a smooth, unblemished finish to your part, we recommend choosing a secondary finish: grained finish or powdercoat.
Yes, we offer CNC Turning (Lathe), as well as CNC Machining with 5-Axis, 3-Axis and CNC Routers.
Let’s discuss your project. For DMF review, please click here.
Click HereWe’ll conduct a quality inspection on each order, further reports and certification can be offered at your request. Please submit the order to start.
Critical dimensions
Quantity of parts
Removal of sharp edges and burrs
Number of parts inspected
Surface finish
Full dimensional inspection report
Material/mill test report
ISO9001, ISO14001, ISO27001 and IATF 16949 certifications
First article inspection for orders of 100+ units
Certificate of Conformance
Material Test Reports
| Size Limit | Metric | Imperial |
|---|---|---|
| Maximum part diameter | 431mm | 17 inches |
| Maximum part length | 990mm | 39 inches |
| Maximum swing on carriage | 350mm | 13.7 inches |
| Maximum spindle through hole | 40mm | 1.5 inches |
CNC milling (computer numerical control milling) is a CNC machining process that involves removing material from the workpiece by rotating and moving a cutting tool, such as a milling cutter, and positioning the workpiece properly, to produce or finish a custom CNC machining object. CNC milling technique can be used to shape a part from beginning to finish, it’s best to produce features or definitions as a secondary or finishing process for machined components. The milling cutting tool can be placed horizontally or vertically, but since the numerically controlled milling machines have evolved strongly, moving on several axis, up to 5 axis, allowing much more to movement of the cutting item in addition to the repositioning of the piece.
CNC milling service, one type of CNC machining service, is ideal for manufacturing CNC milled parts with high accuracy and tight tolerances in prototype and small/large batch production, which achieved through the following common CNC milling operations.
Other milling operations: Gang Milling, Side Milling, End Milling, Saw Milling, Helical Milling, Cam Milling, Milling Keyways, Grooves and Slot.
CNC milling machine employs a rotating cylindrical tool (milling cutter) held in a spindle to perform the milling operations, for getting a wide array of shapes, slots, holes, and other necessary impressions. As a common Computer Numerical Control machine, CNC mill has the ability to cut in different angles and move along several axes, allows a variety of milling parts features and designs. The workpiece on CNC mill can be moved across the tool in certain direction.
– 3-axis milling machines: have a table that moves in the X, Y, and Z axes, and can cut vertically and in any direction.
– 4-axis milling machines: an additional rotary axis that allows the cutting tool to move around the workpiece in a circular motion.
– 5-axis milling machines: two additional rotary axes, allowing for more complex cutting operations.
– Vertical milling machines: a spindle that is perpendicular to the worktable and moves up and down.
– Horizontal milling machines: have a spindle that is parallel to the worktable and moves left and right.
– Manual milling machines: operated manually and do not have any automated controls.
– CNC milling machines: controlled by a computer and capable of precise and complex cutting operations.
– Benchtop milling machines: small and portable, designed for use on a workbench or tabletop.
– Floor-mounted milling machines: larger and heavier, designed for heavy-duty milling operations.
To suit various applications and purposes, there are different types of cutting tools used in CNC milling.
| End mills | the most commonly used milling cutters, with cutting edges on both the bottom and the sides, allowing them to cut in multiple directions. |
| Ball nose end mills | similar to end mills but have a rounded end, suitable for machining curved surfaces. |
| Face mills | used to cut flat surfaces and create square edges. |
| Hollow mills | the opposite of face mills, the workpiece is fed into the inner part of the machine to produce a cylindrical feature. |
| Side-and-face cutter | with teeth around the circumference and one side, functions similarly to end mills. |
| Fly cutters | single-point cutting tools that are used for light milling operations. |
| T-slot cutters | used to create T-shaped slots in the workpiece. |
| Thread mills | used to create internal or external threads in the workpiece. |
| Chamfer mills | used to create beveled edges or chamfers on the workpiece. |
A milling machine consists of different components, which enable it to perform the desired operation smoothly and accurately.
– Control panel: the interface where the operator enters the instructions for the milling machine to control the different cutting operations, it usually contains a CNC monitor, keyboard, and other input devices.
– Spindle: the rotating component that holds the cutting tool, the shaft of the spindle is where the tool is attached, the spindle is driven by a motor and can rotate at various speeds to accommodate different types of cutting tools. The spindle can be vertically or horizontally positioned.
– Worktable: the flat surface on which the workpiece is placed. The worktable can be moved in various directions by the CNC milling machine to position the workpiece for cutting.
– Column: holds together the entire assembly to offer mechanical strength to the mill.
– Saddle: located under the worktable for support and movement to the table in parallel to the spindle axis.
– Axes: CNC milling machines typically have three or more axes, which are used to control the movement of the cutting tool and workpiece. The most common axes are X, Y, and Z, which correspond to horizontal, vertical, and depth movements, respectively.
– Coolant system: used to deliver coolant to the cutting area to prevent overheating and prolong the life of the cutting tool.
– Tool holder: used to mount the cutting tools in the machine, available in various sizes, systems, and specifications, common types including BT 30, BT 40, and BT 50.
