CNC machining bronze

Copper Bronze in CNC Machining

Bronze is a metal that is used in a wide variety of industries and applications. It is made of copper, tin, and other alloys to provide strength, durability, and resistance to corrosion. Due to its versatility, it is widely used in CNC machining applications, particularly in manufacturing high-accuracy parts such as bearings, gears, and other complex parts.

Bronze’s Machinability and Applications

Bronze has good machinability that allows it to be easily cut, drilled, and shaped using computerized machines such as CNC, thus making it vital in industries that require high accuracy, such as aerospace, automobile, and manufacturing of medical equipment.

Enhancing Bronze’s Properties

It is for this reason that by changing the composition and treatments of bronze, its mechanical and performance characteristics can be enhanced. For instance, phosphorus improves wear resistance while aluminum increases strength and hardness to suit a given application.

CNC machining bronze: The Process Steps

Bronze CNC machining involves the use of Computer Numerical Control (CNC) machines. The process begins with a CAD model, and CAM software creates toolpaths. The bronze material is then conditioned and positioned on the work table of the CNC machine for milling, turning, drilling, and other detailed work like engraving or etching.

Bronze machining

Quality Control and Polishing

Subsequent to machining, inspection is done using accurate measuring tools to check for compliance with the set tolerances and quality. Some of the last operations, such as polishing or sanding, may be done to give the required surface finish before proper packing for transport or for subsequent operations.

Expertise and Optimization

CNC operators are very important in the process of using CNC machines to machine bronze since they help in achieving the best results as far as accuracy, performance, and durability of the machined components are concerned.

Benefits of CNC Bronze Machining

Bronze CNC machining has many advantages that make it widely used in various industries. The first advantage is that its coefficient of friction is low, and hence, there is no need to apply lubricant frequently during cutting, as is the case with other metals that are denser. This feature not only increases the effectiveness of the production process but also affects the costs in a positive way. Also, bronze has high wear resistance and is applied to the parts that have to be more durable than other elements of a machine.

In the case of machining, the following benefits can be attributed to the use of bronze in a number of ways. It has high machinability and hence can be easily worked into the required form and shape. It can also be formed into intricate forms without dulling the cutting tools. This not only saves time but also the cutting tools which in turn helps in reducing the cost in the long run.

It also has a very high corrosion resistance as another property of this metal as mentioned above. This makes it a preferred material for parts that are in contact with the environment or corrosive agents.

Moreover, bronze is quite resistant and, at the same time, quite malleable, which makes it quite versatile. It is not the hardest of all metals, but its satisfactory strength, coupled with its flexibility, makes it suitable for structural parts and ornaments.

In the field of thermal conductivity, it is an advantage of bronze that it has high thermal conductivity. It also assists in cooling during the process of bronze machining so that the workpiece does not get hot and reduces the possibility of it shrinking or expanding in size. This is important in a bid to ensure that there is accuracy in the manufacturing processes and to avoid cases of wastage of materials and tools.

Components such as bearings, gears, and sliding elements are particularly suitable for use in bronze because of their low coefficient of friction through which the parts glide smoothly and for longer periods.

Disadvantages of CNC Machining Bronze

In fact, Bronze CNC machining has its advantages, but it also has its disadvantages that should be considered. The problem with bronze is that it is relatively costly to obtain the right materials to work with in the first place. Bronze is a combination of copper and tin, and as such it is relatively costly than other materials that can be used in bronze CNC machining hence making the overall cost of projects that require the use of bronze high.

Another disadvantage is the problem of when the tools become dull and need sharpening. Bronze is relatively softer, and as a result, it causes faster wear and tear of the machining tools hence frequent replacement. This raises the cost of production and requires the monitoring of the tools from time to time.

When it comes to machining bronze vs brass, CNC machining bronze is also relatively easier to get fine details and shapes than other metals. It is because of its softness. The material is not as hard as metal and, as such, may not hold finer details as well; this may be a disadvantage, especially for detailed projects.

The last disadvantage of using bronze in CNC machining is that it will take a longer time to machine the material. The other disadvantage of bronze is that the time that is taken in performing machining operations on it is relatively longer than that of steel hence increasing the time taken in production. This may impact the project time line and may require some changes in the planning and programming of the project.

Also, machining bronze bushings generates more heat than machining other hard metals like aluminum and steel. This heat can be very destructive to the tools and the quality of the cut, and as such, it may need to be monitored frequently and slow down the rate of machining to ensure that heat-related issues are well controlled. These challenges indicate a need to factor in and strategize when one is to perform bronze CNC machining on projects.

machining bronze

Common Alloys of Bronze for CNC Machining

Here are some widely used bronze alloys employed for CNC machining: Some popular include;

  1. Copper 932 (SAE 660):
  • This bearing bronze alloy comprises a high percentage of copper, tin, and zinc.
  • It is extensively applied in manufacturing bushings, bearings, and other precise components that require high strength and wear resistance.
  • It creates a thin layer on its surface that helps to minimize the contact between the surfaces and thus minimize wear and tear to increase the product’s performance.
  • Flexible, it can be easily shaped and sized to the required form and dimension using computer-operated machines.
  1. PB1 Grade (Phosphor Bronze):
  • Available in grades that conform to the BS1400 standard and is well known for its fatigue properties.
  • Has phosphor to enhance the wear resistance and stiffness of the material.
  • It is suitable for bearings, gears, valve bodies, and bushes due to its formability and better spring properties.
  • The tin content increases mechanical properties and corrosion resistance, making it ideal for aerospace, marine, and chemical applications.
  1. Silicon Bronze:
  • It is a copper silicon and zinc-based alloy in which silicon varies between 0% and 6% on average.
  • It has high strength, is easy to pour, and has good corrosion resistance.
  • Due to the high surface polish, it is widely used in pump and valve parts.
  1. Aluminum Bronze:
  • It comprises copper, aluminum (6-12%), and other elements such as iron, nickel, manganese, and silicon.
  • Austenitic, strong, corrosion resistant, and employed in naval hardware, pumps, and petrochemical industry.
  • It is anti-corrosive in seawater and is used in the oil, petrochemical, and water supply industries.
  1. Bearing Bronze:
  • It has a 6-8% lead for low friction, making it good for use where there is a lot of friction.
  • Due to its low friction property, it is extensively used in bearings and bushings.
  1. Bismuth Bronze:
  • It has 1-6% bismuth which gives it flexibility, thermal conductivity, and corrosion resistance.
  • It is used in bearings, light reflectors, mirrors, and cookery.
  1. Manganese Bronze:
  • May contain up to 3% manganese and has good shock and saltwater corrosion resistance.
  • Used in boat propellers, valve parts, gears, and rapid tooling due to its non-corrosive characteristic.
  1. Copper-Nickel Bronze (Cupronickel):
  • Has more nickel (2-30%), is strong, and is corrosion-resistant.
  • It is used in electronics, marine, ships, pumps, valves, and many other industries.

Surface Finishes for Bronze CNC Machining

Bronze has good mechanical properties; it is easy to machine and has good corrosion resistance hence suitable for CNC machining. Different surface finishes can enhance its performance and appearance: It is also possible to improve its performance and appearance by varying the surface treatment:

1. As-machined Surface Finish:

  • The final process following CNC machining; is typically a surface finish that can be shiny with a non-reflective surface.
  • It is inexpensive and does not require other processes to be performed.
  • May have minor tool marks or burrs that may be removed by post-machining operations.

2. Bead Blasting Finish:

  • This process involves the use of fine glass beads to polish the surface and make it as smooth as possible without any roughness.
  • Enhances the appearance and erases minor imperfections that may be on the surface of the material.
  • Extends the time taken to produce the material and the cost, but the surface finish of the material is improved.

3. Chemical Coatings Finish:

  • Chemicals are applied on the surface to get specific properties like anti-corrosive or aesthetic properties.
  • Provides a long-term and individualized substrate.
  • It is more complex and requires additional steps but offers certain characteristics of the surface.

machining bronze bushings

Each surface finish type has pros and cons, and the choice depends on the application, functionality, and price of the CNC machining of bronze parts.

Cost Optimization & Design Tips for Bronze CNC Machining

Bronze CNC machining has several cost-saving design strategies. First of all, there are additional processes that may be required after the machining process to achieve the desired surface finish or to improve the performance of the component, and these should be incorporated in the design stage to minimize additional costs and time.

Moreover, the thickness of the walls of the bronze parts should also be improved. It is also important not to make the parts too thin as this may cause distortion when being machined, while on the other extreme, it may be challenging to machine thick parts, and this may lead to wastage of material.

Choosing the Right Bronze Type

Another important factor is the selection of the right bronze type. The specific requirements of the application can be matched with the right bronze alloy, which will enhance efficiency and durability while reducing expenses. In addition, avoiding undercuts in design can also be useful in reducing the difficulty and cost of machining complex shapes.

Design Considerations for Bronze CNC Machining

It is also necessary to avoid sharp corners and edges. Bronze, being a softer material, is vulnerable to stress concentrations at sharp points and may crack or fail structurally. Designing the corners of the part or fillets distributes the stress evenly, thus making the part stronger and more durable.

Where The CNC Bronze Machining Parts Are Employed?

CNC-machined bronze parts are very popular in many industries due to the excellent properties of the bronze material.  In agriculture, they are employed in the manufacturing of components like bushings and bearings that are employed in loads and harsh environment applications.  Automotive industries employ bronze in threads, gears, and electrical terminals, which are used in almost all systems in automobiles.

Similarly, in heavy machinery sectors, the bronze parts like screws and bushing are incorporated as crucial parts which assist in the smooth running of the machinery and reduce the rate of degradation.  Bronze is a very useful material when it comes to machining parts that are required to be strong, wear-resistant, and highly reliable in certain conditions because of the elasticity of the material.

Summing Up

CNC-machined bronze parts are crucial in the agricultural, automobile, and heavy-duty machinery industries due to the material’s hardness, strength, and flexibility. These parts are important to ensure that the operation is efficient, reliable, and long-lasting in harsh environments, which are parts of modern production processes.

CNM TECH is one of top 10 aluminum die casting manufacturers in China, that specializes in the production of bronze parts through CNC machining, die casting parts, and we ensure that our products are of high quality and precision. Since we are a specialist in bronze CNC machining, we offer solutions that conform to the needs of a particular industry, promoting advancement within that particular sector. Select CNM Tech as your CNC-machined bronze parts supplier to obtain better performance and outcomes in your field.

CNC prototype machining

A Comprehensive Guide To Prototype CNC Machining

Prototype cnc machining is a valueable choice for producing small quantities of prototypes to large volumes quickly as compared to the other methods. Several kinds of prototypes can be simply made by CNC prototype machining. Appearance prototypes, like the cases of auto cars, offer visual clues on the final part’s look and behavior. On the contrary, functional prototypes need more precision, thus, they stress the product structure and the stability.

CNC machined prototype

The article demonstates about CNC machined prototypes, as well as their advantages, and disadvantages. Moreover, it will highlight the key aspects including;

What is  Prototype CNC Machining?

The prototype cnc machining is a subtractive manufacturing process for precisely producing prototype components that can be utilized for different purposes. These prototype components are employed for testing, and designing phases for parts functionalities. In addition, the primary purposes of such tests for identifying visuals, marketing, or fundraising. Basically, cnc prototype machining produces the samples of a product or a machine that, if approved, will continue to the stages of design finalization, manufacturing, and sales.

CNC’s versatility enables you to make prototypes from different materials such as economical plastics to high strength metals to create prototypes.

Why CNC Machining Is a Valuable Process?

CNC machining is an exceptional option for prototyping detailed feature parts. Firstly, it provides high precision, accuracy, and dimensional stability to parts because of its computerized controls that strictly supervise the movement of the workpiece and cutting tool. This degree of control guarantees that the prototype that is produced is exactly the same as the design. Alongside this, the rapid prototype machining is notably fast, and helps replicate complicated patterns prototypes down to tolerances upto +/- 0.005x. Conversely, processes like injection molding, , and forging or 3d printing which often take months to meet tight tolerances requirements, and molds. Thus, advanced CNC machines let you prototype immediately after the CAD model is converted into the CAM files or g-codes.

Types Of CNC Machines Used For Prototyping:

There are various machining approaches used for shaping functional prototypes, and end-use products.

CNC Turning Prototyping:

CNC turning, using a rotating machine called lathes, for the creation of the cnc prototyping of rounded or symmetrical components. The process is a combination of the material being spun fast and a cutting tool as per programmed code to shape high quality exact specification parts or products. The lathe machines are considered ideal machines for prototypes with round mid-sections because of their specialization in round components.

CNC Milling Prototype:

For intricate prototypes, a CNC machine that has up to five axes may be needed, cnc milling is credible. The extra axes are the ones that make it possible to have a more accurate cutting, thus, the creation of the complicated parts, but the cost is higher. In the CNC milling prototype operations, the computer-controlled tool head cuts the final prototype from the large block of material. The starting block is the basis for the whole machining process.

CNC Routers

The CNC Router is the best way to prototype because it allows you to make the design of the product exactly as you want it to be. CNC routers are like CNC mills and machines but they are more affordable, and they have a gantry system which makes the work area bigger than the machine’s size. Nevertheless, this layout restricts their complexity. Routers are the best option for working with materials like wood, plastic, and soft metals like aluminum. They are usually adopted by industrial machinists and small business hobbyists for replicating exact design feature products.

Usually, 3-axes, or 2-axis routers are widely used for intricate designs. Among these, 2-dimensional routers are used for simpler geometrical components, while 3-dimensional parts are made by using 3-dimensional components. Nevertheless, they cannot be as precise as CNC mills. Because, the process of creating or turning detailed CNC files based on the tool and machine acquires a lot of skill or skilled professionals.

CNC Laser Cutter

The CNC Laser Cutter is a technique that employs a high energy beam of laser cut to shape a prototype product, which is then tested and improved until the final product is made.

The laser cutters that are strong enough to be used by small companies can handle metals like aluminum, as well as sturdy plastics such as; acrylics, textiles, composites, and wood for prototype CNC machining. Their flexibility is the reason why they are the most popular among the small firms that want to make a lot of prototypes without going beyond their budget.

Nevertheless, laser cutters can pose “scorch marks” on the prototype part surface because of generated heat during the cutting process. In addition, the design complexity is usually limited as mostly these CNC cutters can precisely use multiple axes for product development.

CNC machining is considered as an ideal process applied in different manufacturing fields. It helps to form highly detailed and complex feature parts with exceptional dimensional stability, and high degree of precision. In the majority of the industries, a working prototype, or even a version that shows the product’s functionality, is utmost.

In contrast, for the functional prototypes that requires rigrous strength, mechanical stability and specific features that additive methods cannot provide, machined tooling is usually the choice.

Applications of Precision Prototype CNC Machining

Lets discuss various industries that use precision prototyping machining for shaping lightweight components for testing, and validating designs before initialising their part production projects on larger scales. Here are some of the commonest industries that use CNC machining as a primary source to manufacture stringent standard quality exact specification parts or products.

Prototype CNC machining

Medical Industry

In the medical field, CNC machining is the most crucial factor that makes the prototyping process faster. For instance, pharmaceutical companies usually need prototypes to demonstrate the product’s working before the final production. Precision and accuracy are the most important factors, especially in the medical devices, and CNC machining ensures that the prototypes are the exact copies of the final product and can work perfectly in their intended functions. Some examples of the medical industry are; orthotic devices, secure enclosures, implants, MRI machines, research equipment, and so on.

Military & Defense Industry

The fast prototyping CNC machining services are the main reason why they are very important in the defense sector as the complicated mechanisms that are needed for the ammunition and military vehicles are the main factors.

Prototypes are the main components of the guarantee that these mechanisms are working correctly, therefore, CNC prototype machining is the most preferred method. The products or items like aircraft components, transportation and communication systems, ammunition, and various equipment are the examples of products that are produced by CNC machining in this industry.

Aerospace Industry

The aerospace industry is very sensitive to precision as even the slightest inaccuracies can cause the increase of drag or wear of the aircraft components. Thus, the industry needs to have the prototypes to make sure that they are perfect and flawless before they go into production. Prototyping is the process of testing the components in controlled environments and it is sure that they are suitable for real-world applications.

CNC prototype machining is a crucial part of the manufacturing of numerous components for this industry, such as landing gear ports, bushings, manifolds, and airfoils. The widespread application of computer numerically controlled (CNC) machining in the aerospace industry is to be explored.

Automotive Industry

Auto car makers, and OEMs manufacturers always practice rapid prototyping manufacturing for iterating new designs and aesthetic improvements. Thus, the need for production of prototypes for testing before mass production. These prototypes are subjected to strict testing to ensure that they are working properly and are properly fit, tested, and function before full-scale manufacturing begins.

The Prototype cnc machining process is the key factor in the production of accurate car prototypes which are designed according to the given specifications. Besides, CNC prototyping can also be used to produce parts for various vehicles, such as cargo boats, delivery vehicles, etc.

Benefits of Rapid Prototyping Machining

Let’s discuss the benefits of rapid prototyping machining.


CNC machining is a cheap option when you have to produce a few prototypes. Unlike injection molding, which takes several months for mold preparation and tolerance adjustments, CNC prototype machining can start within weeks of blueprints and tolerances finalization.

High Tolerance:

A major benefit of speeding the production of prototypes is the high tolerance ranges that are possible with CNC machining. On the contrary, CNC machining is different from 3D printing in that it creates detailed prototypes that are very close to the final product. This is particularly useful for structural and functional testing.

Prototyping Machining

In most cases, the prototype is the last process of production. Besides, the prototype helps in the early identification of the product’s issues or flaws and also, it accelerates the production by having most of the components already prepared at this stage.

Low Volume Production

Although rapid prototyping is usually linked with prototyping, it is also very successful for low volume production. The methods like injection molding, vacuum casting, and even 3D printing produce products of high quality that can satisfy the initial market demand effectively.

What are the Limitations of CNC Machining Prototyping?

Let’s discuss some of the disadvantages of rapid prototyping machining.

More Expensive Than 3D Printing:

The CNC prototype machining is more expensive than 3D printing for small startups because of the high demands for human supervision and power supply. Moreover, the raw materials used in CNC prototyping are usually more expensive than the materials used in 3D printing, such as PLA.

This cost difference is a major reason why engineers are looking for other prototyping techniques, even though they intend to use machining for the final parts. Although the development is a resource-intensive process, companies usually try to cut down the costs in the early prototyping stages.

Environmentally Unfriendly:

CNC machining, being a subtractive process, produces a lot of waste while material removal tends to incur higher costs on product development budget. This waste is mainly made of chipped metals or plastics that cannot be reused and therefore must be thrown away. This factor is responsible for the environmental unfriendliness of the CNC machining process.

Conventional Vs. Rapid Prototyping: Key Differences

Traditionally, product development prototyping followed these steps:

  1. The process of designing a product using solid modeling software to create a 3D CAD model and 2D drawings. This process usually takes days or weeks to complete.
  2. Gaining quotes from different manufacturers to produce the needed exact specification parts.
  3. It normally takes a long turnarounds from days to even, sometimes months before you get the machined prototype.

The conventional prototyping techniques, in addition, like sand casting, involves the usage of hand made models of clay, wood, wire or tape to produce the parts. Therefore, it’s typically a time consuming process of rapid prototyping. With precision prototype machining like CNC machining, 3D printing, and rapid prototyping, engineers can today create functional prototypes faster and more efficiently than conventional techniques.

Summing Up

CNC prototype machining is a unique method of making prototypes, which is characterized by its fast turnaround and cycle times for fabricating different specifications products. Thus, the most efficient compared to the other alternatives like 3D printing. Besides, CNC machining produces prototypes that are more alike to the actual product.

In addition, its use is vital, and so widespread across manufacturing industries including; automotive, aerospace, and consumer electronics because it provides high performance interior to exterior parts by meeting detailed features, and exact part tolerances as minimum as far to +/- 0.005. It’s recommended before initializing your prototype cnc machining project to consult with industry professionals for optimal outcomes in your projects. So, reach out to us to find out if CNC machined prototypes are the best for your project.