Being a key component in manufacturing today is Computer Numerically Controlled (CNC) machining. Computer software and controlled machinery can remove layers to create custom parts from blanks or workpieces. It works with a vast range of materials such as glass, foam, metal, wood, plastic, and composites.
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CNC Machining
What does CNC Machining Mean?
A CNC machining process is classified as subtractive manufacturing. In comparison, 3D printing and other types of additive manufacturing create parts by adding. Starting with a solid material block, CNC machining uses automated controls to remove material to create a desired shape, and is based on a digital 3D design.
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Advantages of CNC Machining Services
In comparison to other manufacturing methods, CNC Machining demonstrates higher precision, greater consistency, and a greater ability to create complex designs. In addition to these, the process is scalable, making it ideal for one-off prototypes and large production runs.
Different Kinds of CNC Machine
Although all CNC (Computer Numerical Control) machines automate tasks, they each perform different functions. Here’s a look at a few of the most common types:
-CNC Mills: Work with rotary cutting tools to eliminate materials.
-CNC Lathes: Rotate the workpiece against a still cutting tool to achieve a desired shape.
-CNC Routers: Work like a CNC mill, but they typically work with softer materials like wood or plastic.
-Electrical discharge machines (EDM): Shape materials using computer-controlled electrical sparks to erode material.
Custom CNC Machining Services
Getting To Know Custom CNC Parts
Custom CNC machining means producing parts with specific detail, such as unique specifications, measurements, and drawings. This kind of service fills the need of a great number of industries that require machined parts that are not available on the general market.
What is the process of Custom CNC Machining
Every custom CNC machining process starts with a CAD (Computer-Aided Design) model. This CAD model is converted to a CNC program, also known as G-Code, that tells the machine different instructions and movements. Then the machine is set up with the right tools and material the machining process is started. Once this is complete, the part is thoroughly inspected and finishing touches are applied.
What are some of the applications of Custom CNC Manufacturing
Custom CNC parts are used in a wide range of industries such as Aerospace, Automotive, Medical, and Electronics. Some of the applications include: components of engines and machinery, custom tools, surgical instruments, and electronic enclosures.
CNC Machining Materials
Materials Used in CNC Machining
CNC machines can work with many different types of materials. Some of the most common metals include: steel, aluminum, stainless steel, brass, and even titanium. They can also work with many types of plastics like: ABS, polycncarbonate, nylon, and PEEK.
Plastic vs. Metal for CNC Machining
Metals: They usually have more strength, are more durable, and can withstand more heat. They are more suitable for structural components.
Plastics: Plastics have many advantages like chemical resistance, insulating capability, and they are much more lightweight. It is common to use plastics in prototypes, enclosures, and for many parts that don’t have a lot of load requirements.
Finding the Right Materials for Your Projects.
When choosing a material, that decision will depend on what the part is meant to do. They are considering mechanical strength, the environment ( temperature, chemicals), and the price.
Precision CNC Machining
The Impact of Tolerance in CNC Machining
In any mechanical assembly, tolerance is the most important parameter. It is the range of permissible variation in a particular physical dimension. For any components that are interfacing with one another, they have to have tight tolerances in order to ensure the required functionality of the assembly. In CNC machining, the standard tolerances are around +/- 0.005 inches, and advanced machining can achieve even tighter tolerances.
Achieving Precision Surface Finishes
Before a CNC machine finishes a part, certain secondary processes may include, but are not limited to, anodizing, polishing, or bead blasting. All of these can alter the characteristics of the part and help achieve a surface finish.
Precision CNC Vs. Traditional Machining
Precision CNC machining uses computer programming to dictate the operation of tools, while traditional machining relies on the operator’s skill. Because of the differences, there is more automation, less room for error and greater speed. Identical parts can be created with minimal variance.
CNC Machining Processes
Overview of the CNC Machining Process
Steps include:
Design a CAD model.
Convert the CAD file to a CNC program.
Set up the CNC machine.
Run the machining operation.
CNC Turning and Its Applications
A Cutting tool moves linearly while the workpiece rotates, this is known as CNC turning. It is a necessity for the creation of cylindrical parts which include but are not limited to shafts, bushings, and pulleys.
Sheet Metal Fabrication In CNC Machining
Although it is not like machining blocks, sheet metal fabrication uses CNC technology and is often distinct from it, using equipment like laser cutters or turret punches. Metal sheets are cut and formed into parts such as brackets, panels, and chassis.
Online CNC Machining Services
Advantages of Choosing Online CNC Services
With Online CNC services, there is no need to waste time on procurement. Services include automated design-for-manufacturability feedback, instant quoting, and global partnerships with manufacturers, leading to reduced costs and lead times.
Quote to Delivery Process with Online Services
A customer uploads their CAD file to the online service of their choosing. The service analyzes the requirements of the CAD file and provides the customer with an instant quote. The customer is required to confirm their order before the service will manufacture the part and ship it to them.
Analyzing Online CNC Machining Services
When choosing an online CNC service, consider lead times, the selection of materials, and the quality of certifications (ex. ISO 9001) and production.
