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Turned Parts

CNC machining, standing for Computer Numerical Control machining, is the automated removal

of material from raw stock guided by computer-generated instructions.

This process is versatile, compatible with materials ranging from expanded polyurethane foam to

nickel superalloys. Common applications for CNC machining include fabricating various

components, crafting ornamental furniture, and producing turbine blades.

The cost of CNC machining is contingent on factors such as required precision, surface quality,

quantity, material selection, and the overall complexity of the part.

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The primary focus of the CNC machining process revolves around metals, incorporating alloy steel,

carbon steel, cast iron, stainless steel, aluminum, copper, magnesium, and zinc.

Nevertheless, CNC machining extends its capabilities beyond metals to encompass plastic parts

and other materials, including ceramics, composites, thermoplastics, and thermosets.

CNC Machining Tolerances

Typical machining tolerances fall within the range of ± 0.005 inches or 0.13 millimeters.

Tolerances represent the allowable variation for a specific dimension.

For instance, if a CNC machining tool has a tolerance of ± 0.01 millimeters, it means that the tool

can deviate by 0.01 millimeters in each cut.

When provided with a drawing, Our CNC machining service can achieve CNC parts with tolerances

as tight as ± 0.0002 inches.

In the absence of a drawing, all CNC parts are manufactured according to our ISO 2768 medium

standard. We can also work to even tighter tolerances, such as ± 0.025 millimeters or ± 0.001

inches, when an engineering drawing specifies critical features.

Applications of CNC Turning

CNC turning services are indispensable in several key industries, with a significant impact on

transportation sectors like aerospace, automotive, mass transit, rail and locomotive, military,

and trucking.

Within these realms, CNC machines are instrumental in crafting essential transportation

equipment, ranging from headnuts and gear blanks to bearing blocks, levers, axles, and rotors.

In the construction industry, CNC machines are harnessed to produce robust bolts and screws,

crafted from materials like stainless steel and aluminum, crucial for handling heavy-duty applications.

Furthermore, CNC turning services are pivotal in the manufacturing of diverse auto parts,

encompassing engine components like cylinder heads, connecting rods, and camshafts, transmission

parts including shafts and rings, as well as suspension components like sway bars, control arms,

and tie rod ends.

The aviation sector also benefits significantly from CNC turned parts, utilizing them for the

customization and production of probes, joint connectors, fasteners, and engine and aircraft

components, often opting for titanium due to its resilience to extreme temperatures.

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FAQ's

1. A quick guide to CNC machining parameters

Most machining parameters are established by the machine operator during the generation of

G-code.
Build Size of CNC Machines:

CNC machines offer a notably large build area, especially when compared to 3D printers.
CNC milling systems can handle parts with dimensions up to 2,000 x 800 x 100 mm (78” x 32” x 40”).
CNC turning systems can machine parts with a diameter of up to Ø 500 mm (Ø 20’’).

Accuracy and Tolerances:

CNC machining enables the production of parts with high accuracy and tight tolerances.
Tolerances achievable with CNC machines can be less than half the diameter of an average human

hair, reaching ± 0.025 mm or .001’’.

If tolerance is not specified in the technical drawing, the operator typically machines the part with an

accuracy of 0.125 mm (.005’’).

Key Takeaways:

CNC machines excel in both build size and precision, making them suitable for a wide range of

applications.
Operators have the flexibility to set machining parameters based on the specific requirements

of the project.
Understanding the build size and achievable tolerances is crucial for designing parts that meet

precision and accuracy standards.

2. How much do CNC machining materials cost?

CNC machining offers a plethora of material choices, leading to varying costs across different options.

The price range for materials is broad, influenced by factors such as physical properties and specific

characteristics of each material.

For metal parts, Aluminum 6061 stands out as the most economical choice. If cost is a primary

consideration, ABS emerges as the most budget-friendly option.

Additionally, the ease of machining significantly impacts costs, with materials like stainless steel

posing a higher machining difficulty compared to aluminum, thereby contributing to an increased

overall cost.

3. What's the general surface texture of CNC milled and turned parts?

Typically, machined milled parts exhibit a surface roughness of around 3.2μm

(or 1.6μm for newer machines). On the other hand, turned parts can achieve a finer surface with

a roughness of 0.8μm. This indicates that the machining speed does not necessarily need adjustment,

highlighting the precision attainable in turning processes.