One of the primary challenges in plastic material selection for CNC machining is that not all plastic materials are suitable for a particular part Or application. It’s important to select the right material for any part, but selecting a plastic for machining is particularly tricky.
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Some plastics also exhibit significant dimensional instability, impacting tolerances, and some also have limited color options. There are strength considerations, resistance to stress cracking, or heat expansion. Application-specific considerations such as chemical resistance, food safety, or self-lubrication can also be an aspect.
The potential cost implications and performance issues associated with incorrect material choices cannot be overstated. Using the wrong material can lead to increased scrap rates, longer lead times, and higher overall production costs. It can also result in parts that do not meet the required specifications, leading to quality issues and customer dissatisfaction.
Fig. 1: CNC Machined Plastic Parts
Selecting the right plastic material for CNC machining is indeed a critical decision, as it significantly influences the performance, cost, and quality of the final product. Several factors need to be considered when choosing a material:
Consider the part type
Consider Part Use
Determine the specific requirements of the part, including mechanical properties (strength, hardness, etc.), dimensional tolerances, surface finish etc.
Consider the application
Finalize Requirements & Selection Criteria
Based on the product and application requirements, establish criteria for selecting the plastic type, considering factors such as machinability, cost, availability, and suitability for the application.
Fig. 2: Simple CNC Machined Parts Made of Plastic
Material Properties
Tensile strength, yield strength, hardness, and ductility are important mechanical properties. Higher tensile strength and hardness are desirable for parts subjected to high loads, while ductility is important for parts that require deformation without breaking.
Thermal Properties
Thermal conductivity and coefficient of thermal expansion are important for parts subjected to temperature variations. High thermal conductivity helps in dissipating heat generated during machining, while a low coefficient of thermal expansion ensures dimensional stability at different temperatures.
Chemical Properties
Corrosion resistance and chemical compatibility are crucial for parts exposed to corrosive environments or chemicals.
Machinability
Factors such as material machinability, complexity of the part, and machining time. Materials that are easy to machine, may result in shorter machining times compared to harder materials.
Costs
Cost-effectiveness in material selection involves evaluating the cost per kilogram of material and the machining time required to produce the part. Some materials may have a higher initial cost but offer cost savings in terms of reduced machining time.
Many companies struggle to find reliable and cost-effective suppliers for low and medium-volume production – prototyping companies charge high set-up costs and per-piece pricing; larger manufacturers are not interested in orders of several hundred or even thousand pieces. Not to mention the time and expertise needed to manage and coordinate with these suppliers. Komacut is a solution to bridge the gap between prototyping and mass production, with instant quotes, easy management, and flawless execution from quote to order to delivery.
For more information on designing and manufacturing CNC machining and machined parts, please visit the Komacut website. Instant quotations and design feedback, a range of materials, engineering design guidelines, and more - visit Komacut today for superior CNC machining solutions.
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What are the most commonly used plastics in CNC machining?
Commonly used plastics in CNC machining include ABS, polycarbonate, nylon, PEEK, Delrin (acetal), and PTFE (Teflon). Each of these materials offers unique properties suitable for various applications.
How do I determine which plastic is best for my project?
To determine the best plastic for your project, consider factors such as mechanical properties, thermal resistance, chemical compatibility, and cost. Additionally, the specific requirements of your application, such as load-bearing capacity, wear resistance, and environmental conditions, should guide your selection.
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What are the advantages of using plastic over metal in CNC machining?
Plastics offer several advantages over metals, including lighter weight, corrosion resistance, lower cost, and ease of machining.
How does the machinability of plastics compare to metals?
Plastics generally have better machinability compared to metals due to their lower hardness and density. They require less cutting force and can be machined at higher speeds, reducing tool wear and production time. However, some plastics may have specific challenges, such as melting or deforming under high temperatures, which need to be managed during machining.
What surface finishes can be achieved with CNC-machined plastics?
CNC-machined plastics can achieve a variety of surface finishes depending on the machining process and tools used. Common finishes include a smooth, polished finish, matte or textured finishes for improved grip or reduced glare, and precision finishes for tight tolerance parts.
Are there any special considerations for machining reinforced plastics?
Reinforced plastics, such as those with fiberglass or carbon fiber, require special considerations due to their abrasive nature. These materials can cause increased tool wear and may require the use of carbide or diamond-coated tools.
How does production volume impact the choice of plastic material for CNC machining?
For low production volumes, CNC machining is a cost-effective method for producing plastic parts and is often used for prototyping or pilot productions due to the lack of any requirement for mold or tooling investment. However, for medium to high-volume production, other manufacturing methods such as vacuum casting or injection molding will have a definite cost advantage.
Can recycled materials be used in CNC machining?
Yes, certain recycled materials, such as recycled PET (rPET), can be used in CNC machining. They can offer cost savings and environmental benefits but should be evaluated for consistency and performance compared to virgin materials. In general, plastics with a high (25%+) percentage of recycled content tend to be more brittle and have degraded physical properties.
With 3-axis CNC milling, the cutting tool uses three axes to remove material from a stationary object. These three axes are typically the X, Y, and Z axes. The X-axis is horizontal and runs left to right, the Y-axis is vertical and runs up and down, and the Z-axis is perpendicular to the other two and runs forward and backward.
3-axis milling is ideal for creating complex shapes, holes, and sharp edges in metal, plastic, and wood materials. The aerospace, automotive, and manufacturing industries commonly use 3-axis CNC milling to produce components. This type of milling allows for precise cuts and a high degree of accuracy, making it a popular choice for creating intricate parts. Additionally, 3-axis milling machines are versatile and use these machines for various applications, from prototyping to full-scale production.
4-axis CNC milling is a machining process that involves using a machine tool with four axes that can move simultaneously to produce complex shapes and features. The machine operates on multiple axes, including the X, Y, and Z axes, and an additional rotation around one of the axes known as the A-axis. This extra rotational capability allows the machine to create intricate cut-outs on the side of a workpiece, such as slots, pockets, and other complex shapes. The A-axis can be combined with the other three axes to produce complex 3D shapes that would be difficult or impossible to create using traditional 3-axis milling techniques. Overall, 4-axis milling is a powerful and versatile machining process that allows manufacturers to produce high-quality, complex parts with precision and efficiency.
5-axis milling machines are advanced tools capable of producing complex parts for various industries. These machines incorporate four axes of 4-axis machining, which enable them to move the cutting tool along three-dimensional planes. The fifth axis is rotational (B-axis), allowing the cutting tool to move around the machined part. This additional axis gives 5-axis milling machines a level of flexibility and precision unmatched by other machines. This technology allows manufacturers to produce intricate parts with complex geometries, including parts with undercuts, radii, and steep angles. The 5-axis milling machines are an excellent choice for industries that require high precision and accuracy, such as aerospace, automotive, and medical.
A 9-axis mill-turn is a highly advanced, sophisticated precision engineering and manufacturing tool. It is similar to a 5-axis machine in its basic capabilities but offers much more. In addition to the X, Y, and Z axes, 9-axis mill-turn machines can move the workpiece along the B-axis and use additional tools to create intricate and complex parts.
One of the primary advantages of a 9-axis mill-turn machine is its ability to perform angle milling. This process cuts and shapes a workpiece at an angle, allowing for more intricate and complex designs. The machine’s additional tools, such as drills, taps, and reamers, can also be used to make holes and other features in the workpiece.
Another advantage of a 9-axis mill-turn machine is its ability to perform balance turning. This process involves turning a workpiece while maintaining balance, allowing for more precise and accurate cuts. It is beneficial when working with delicate or complex parts that require a high degree of precision.
A 9-axis mill-turn machine is a versatile and powerful tool for creating complex parts for various industries, including aerospace, automotive, and medical. Its advanced capabilities make it an essential tool for precision engineering and manufacturing.
A CNC router is a highly advanced manufacturing process that uses computer-controlled machines to cut and carve materials such as wood, plastic, and metal into desired shapes. The machines are programmed to read instructions that guide the cutting and shaping process. The CNC machines use rotating cutting tools and precise movements to remove material from the workpiece. The cutting tools are precisely positioned by the computer, ensuring that the material is removed with high accuracy. CNC routers are used in various industries, including woodworking, metalworking, and plastic fabrication. They are handy for creating complex shapes and patterns that would be difficult or impossible to produce with traditional manufacturing methods. CNC routers have revolutionized the manufacturing industry by increasing productivity, reducing waste, and improving the quality of finished products.
Sinker EDM is a manufacturing process that involves submerging a shaped electrode (usually made of graphite or copper) and a workpiece in an electrically conductive fluid. A controlled electrical charge passes between them. As the electrode approaches the workpiece, it creates sparks, melting the material on its surface. The fluid flushes the melted material away, and the electrode contours the shape of the design.
Although the electrical charge used is very high, it only lasts briefly. The process requires precise control since the electrical discharge can damage the workpiece to achieve the desired shape. Sinker EDM creates tools, dies, and molds for the automotive, aeronautical, and medical industries.
Wire EDM is a machining process that utilizes electrical energy to cut through hard materials precisely. It involves a thin, electrically charged wire that creates precise cuts through electrically conductive materials like metals. During the process, an electrical discharge is applied to the wire, creating a spark that melts the workpiece’s surface. A dielectric fluid then flushes away the melted material and circulates the cutting area. The wire electrode continuously moves while producing electrical discharges, creating a path that forms the shape of the desired final component. Its high precision and accuracy make Wire EDM ideal for aerospace, medical, and automotive applications, where tight tolerances are required.
Stainless steel is a type of steel that has undergone a machining process. It is known for its high strength, corrosion resistance, and aesthetic appeal, making it a popular manufacturing choice. However, machining stainless steel can be challenging because of its hardness and rigid properties. The aerospace, automotive, and medical industries typically use stainless steel with grades 304, 316, and 420. Consequently, we machine stainless steel components in various sizes and levels of complexity for use in applications such as surgical instruments, automotive components, and industrial machinery.
Nylon is a thermoplastic material known for its durability, strength, and lightweight properties. Due to these characteristics, it is a popular choice for various applications. It can be easily machined to produce complex shapes and parts of different sizes, making it a versatile material for multiple industries. CNC machining is a process that involves cutting, drilling, and milling nylon to create high-quality finished products with precise specifications. The aerospace, medical, automotive, consumer electronics and industrial industries use nylon because of its excellent resistance to impact, chemicals, and wear. This makes it the perfect material for use in demanding environments.
Polycarbonate is a thermoplastic known for its high strength and durability, making it a popular choice in various industries. Its clear/translucent composition also makes it a sought-after material for applications that require good visibility, such as medical devices, aircraft windows, and machine parts.
Polycarbonate is also lightweight, making it an excellent choice for applications requiring solid materials that do not weigh too much. It is also resistant to impact, making it an ideal material for products prone to rough handling or accidental drops.
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