What is CNC Turning?
CNC (Computer Numerical Control) turning is a subtractive manufacturing process where a cylindrical workpiece rotates while a cutting tool moves in a linear fashion to remove material, shaping the part. Performed on a CNC lathe controlled by computer-generated codes, it offers high precision and repeatability. Turning is ideal for creating symmetrical parts like shafts, knobs, and pulleys. The integration of computers ensures efficient and consistent production. Common in industries such as automotive and aerospace, CNC turning can work with a diverse range of materials, from metals to plastics, delivering various finishes.
Applications
Metals
Grades Available:
5052, 6061, 7050, 2024-T3
Finishes:
As Machined, Anodized, Hard coat Anodized, Powder coated, Bead Blasted, Vibrate Polished
Description:
Lightweight, corrosion-resistant metal widely used in aerospace and packaging due to its versatility.
Grades Available:
1018, 12L14, 1144
Finishes:
Nickel Plated, Zinc Plated, Powder Coated
Description:
A strong alloy of iron and carbon used in construction, automotive, and various industries.
Grades Available:
303, 304
Finishes:
Nickel Plated, Zinc Plated, Powder Coated
Description:
Corrosion-resistant alloy of iron, chromium, and often nickel, known for durability and shine.
Grades Available:
C360
Finishes:
As Machined
Description:
A yellowish alloy combining copper and zinc, lauded for malleability and decorative applications.
Grades Available:
101, C110
Description:
Reddish-brown metal with excellent conductivity, utilized in electrical and plumbing tasks. applications.
Grades Available:
932
Description:
Copper-tin alloy, recognized for strength and historical use in artifacts and sculptures.
Grades Available:
Grade 2, Grade 5
Description:
Lightweight, strong metal resistant to corrosion, common in aerospace, medical implants, and jewelry.
More materials available upon request
Plastics
Grades Available:
General
Finishes:
As Machined, Bead Blasted
Description:
Durable plastic renowned for strength, impact resistance, used in automotive and consumer goods.
Grades Available:
General
Finishes:
As Machined
Description:
Transparent or coloured thermoplastic with excellent optical clarity, lightweight, weather-resistant, often used in signage, displays, and protective barriers.
Grades Available:
White/Black
Finishes:
As Machined, Bead Blasted
Description:
Rigid plastic with low friction, suitable for mechanical parts and precision components.
Grades Available:
General
Finishes:
As Machined
Description:
Tough, transparent plastic valued for its impact strength, used in eyewear and protective barriers.
Grades Available:
General
Finishes:
As Machined, Bead Blasted
Description:
Ultra High Molecular Weight Polyethylene, a robust, wear-resistant plastic for demanding applications.
Grades Available:
General
Finishes:
As Machined
Description:
High-Density Polyethylene, a strong, chemical-resistant plastic common in packaging and containers.
More materials available upon request
Maximum part size: 16.0″ (406mm) x 10.0″ (254mm) x 10.0″ (254mm)
This is the maximum part size our lathes can accommodate.
Minimum cutting tolerances: 0.001” (0.254mm)
This is the maximum precision of any dimensions on the part.
Design Guidelines
Designing parts for a CNC (Computer Numerical Control) lathe requires a blend of good design practices, an understanding of the machine’s capabilities, and consideration for ease of manufacturing. Here are some tips for designing parts for a CNC lathe:
Simplify Geometries: The simpler the geometry, the easier and quicker it will be to machine. Avoid unnecessary complexities.
Generous Radii: Whenever possible, use larger fillet radii. Smaller radii can require specialized tools that increase machining time.
Limit Deep Recesses: Deep cuts or grooves can lead to tool chatter, reducing surface quality. If necessary, design in stages or steps.
Avoid Undercuts: These can be challenging to machine and might require specialized tooling.
Tolerances: Only specify tight tolerances where necessary. Tighter tolerances can significantly increase production time and costs.
Surface finish: Understand the natural finish the machining process will provide and specify additional finishes only if required.
Tool Access: Ensure all features can be accessed by standard tooling. Avoid deep pockets or areas that are hard to reach.
Part Symmetry: If the part is symmetrical, design it in a way that allows for it to be flipped or rotated easily for machining all features.
Thread Considerations: If threading is required, consider standard thread sizes to avoid the need for custom taps or dies.
Consolidate Features: Reduce the number of operations by consolidating features. For example, if two holes can be combined into a slot, it might simplify the machining process.
Material Selection: Chooser a material that’s not only suitable for your end application but also on that’s easily machinable. Some materials are notorious for being difficult to work with on a lathe.
Stock Size: Design with standard stock sizes in mind. This can reduce material waste and costs.
Remember, while CAD software allows you to create almost any shape, practical considerations for manufacturing can dictate design changes. It’s always beneficial to design with the end manufacturing process in mind.
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