CNC Machining Parts: Features, working, uses

Precision Grinding

• This process cuts materials on the surface of parts with applications of a grinding wheel that make a smooth surface and a highly accurate design.

CNC Tapping

• CNC tapping is a commonly used method employed for the creation of threads. It makes threads in holes drilled with a tap and chamfered for connection screws in the hole. CNC tapping accurately cuts inner threads at certain positions.

Laser Cutting

• Laser cutting uses blowing, vaporizing, or melting through applications of a high-power laser beam that results in accurate cutting in the working component. This method is used for cutting metal, plastic, and other material types.

EDM Machining

• EDM uses electric discharge for material cutting on working components that provide high-accuracy features used for making complex design parts.

Wire Machining

• It is a type of EDM that is a non-connection subtractive process that employs electrically charged thin wires with dielectric fluid for cutting metallic components in different designs.

CNC Manufacturing Process 

• The CNC machining process comes with a combination of different processes that is material removal, for making the design of any part.
• Each process is controlled through a computer, which comes with the movement of tools, providing high accuracy.
• So CNC’s full form is computer numerical control.
• As compared to the 3D printing process, it is a subtractive manufacturing process that needs larger materials at the start, with extra materials slowly removed to make certain designs.

Milling Processes

• In CNC milling, the working material is static, and the cutting tool moves and extracts material like peeling layers.
• This process is good for components that have flat surfaces, pockets, and slots.
• It is also used for designing and making components that need holes, angles, and complicated design shapes.
• CNC milling is an accurate and flexible method that operates by using plastics and some metallic materials.

Turning Processes

• CNC turning follows different methods, like working component rotation and tool operation in static conditions. The tool performs a cutting process over the material’s surface.
• This process is good for making circular-shaped parts such as rods, shafts, and pipes. Turning is a common process as compared to milling and is preferred for making symmetrical designs over the centerline and at high speeds as compared to the milling method.

Hole-Making Processes

• Different process used for making a hole. spinning drill bit used for low- to high-level drilling. For providing high accuracy and good surface finishes, holes are bored and reamed A boring process with increasing size provides a good position, and reaming provides finishes through certain designs and makes the quality a smooth surface.
• All the above processes are applied in combinations for increasing high efficiency for parts.

CNC Milling vs. Turning

• CNC milling and CNC turning are two processes for subtractive manufacturing. These two processes remove material through a solid working component, but both perform different techniques. Milling uses spinning tools and a fixed working component.

Difference

• The basic differences are as
• CNC milling: the cutting tool is part of the moving and working component.
• For CNC turning, the working component moves and the cutting tool remains static.

Which one has the best parts?

• Milling is used for square, flat, or irregular designs through complex designs.
• turning good for round, rotational components and cylindrical layout

working

• CNC milling provides rotary cutting tool movement and fixed components over x, y, and z axes for removing material and design complications.
• In CNC turning, the working component is held in the chuck and moves at a high rotating speed. A static tool moves over the surface to make a cylindrical design.

Advantages of CNC Milling

• Milling machine is a good process that handles complicated designs and components that provide high accuracy.
• It can be operated with different materials like steel, aluminum, and plastic.
• It can easily perform different functions like slotting, contouring, and surface finishing in one configuration.

Disadvantages of CNC Milling

• It is not a good process for rotational components, since it has low efficiency and takes time.
• The tool used for the process gets damaged quickly due to larger surface connection when cut at different axes at different angles, especially for hard metals.
• It also requires CAM programming and setup for advanced components.

Advantages of CNC Turning

• It is good for symmetric components like shafts, rods, and bushings, fast.
• Turning centers are a low-cost and high-speed process for larger-scale manufacturing of cylindrical components.

Tolerances of CNC-machined parts

Tolerance is the allowable deviation from the standard range. For CNC machining, tolerance is the acceptance of deviation from the required dimension that is required for the project’s demand. the degree of variation from a certain dimenoson that accepted

Factors Affecting CNC Tolerances

• Different factors have effects on the tolerance level for CNC machining, which are the materials for machining, the type of machine, working life, and the programming methods.
• Tolerance for different materials and machines can be different; it is important that a good engineer has knowledge of setting and makes sure accurate adjustments are made for each project to provide a certain tolerance.

Importance of Tolerances in CNC Machining

• Tolerance measurement and maintenance are important for the accurate working of projects, and each component can be interchanged.
• So, proper tolerance for CNC machining is important so that parts are reliable and fulfill the required features.
• The knowledge of telerance level make cost-effective CNC machining processes.

JUSTWAY also provided tolerances based on process, material used, and geometry; they also followed the ISO 2768/GB/T1804 CNC machining standard.