Manufacturers use plastic machining in Atlanta, GA, to produce durable, lightweight parts with properties such as chemical resistance, electrical insulation, and low friction. In the right applications, machined plastics perform practical functions similar to metal components with less weight and potentially lower production costs.
At Roberson Machine Company, we machine plastics for prototypes, replacement parts, high-volume production runs, and components used within larger equipment and assemblies.
Learn More About
- What plastic machining does for parts produced from solid stock
- How heat, workholding, and material behavior affect the machining plan
- Which CNC processes create different plastic parts and features in Atlanta, GA
- Where machined plastic components are used across industrial applications
- How common plastics compare by properties and intended use
- How process planning supports higher quantities and repeat orders
- Practical answers about pricing, materials, and production decisions
For help planning a plastic machining project in Atlanta, GA, contact us online or call 573-646-3996 to review material options, order quantities, and production timing.
What Is Plastic Machining?
Plastic machining creates finished parts by using a subtractive manufacturing process to remove material from solid plastic stock. CNC equipment follows programmed toolpaths based on a drawing or digital model until the part reaches its required geometry and dimensions.
Machined plastic parts may begin as sheets, plates, blocks, rods, or tubes. Machining components from standard stock eliminates dedicated molds, allowing designs to be produced or revised without new molding tools.
What Changes When Machining Plastic Instead of Metal?
Plastic can be machined with many of the same CNC processes used for metal components. The main difference is how the material responds to heat, cutting pressure, workholding, and changing environmental conditions.
Heat Control and Finished Cuts
Most plastics conduct heat less efficiently than metals, which allows heat to build around the tool and cutting area. Excessive heat can affect both finished quality and dimensions by softening or distorting the plastic.
Proper chip evacuation helps protect the quality of the machined surface. Poor chip evacuation may increase local heat and obstruct the cut, contributing to cracks, rough edges, burrs, and similar surface problems.
Workholding Without Part Distortion
The stock must be held firmly enough for machining without pressure that damages or deforms the material. Machining plans may need to consider:
- Flexing in thin walls or features without adequate support
- Bowing in large parts or materials with limited stiffness
- The effects of temperature, moisture absorption, and internal stress on final dimensions
Matching the Process to the Plastic
Tooling and cutting parameters affect acrylic, nylon, acetal, PEEK, PTFE, UHMW, and other plastics in different ways. Machining and inspection plans should reflect the chosen resin and grade as well as the conditions the finished part will encounter.
What CNC Processes Are Used to Machine Plastic Parts in Atlanta, GA?
The component’s geometry, tolerances, features, and starting stock shape the precision CNC machining approach used to produce it.
| CNC Process | Example Plastic Parts | How the Process Is Used |
|---|---|---|
| CNC Milling | Housings, covers, brackets, plates, mounts, manifolds, fixtures, and acrylic instrument parts |
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| CNC Turning | Bushings, sleeves, spacers, rings, pulleys, shafts, pins, and ink rollers |
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| 5-Axis Machining | Contoured housings, complex fixtures, medical components, and multi-sided parts |
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| Multi-Axis Machining | Valve components, sensor hardware, enclosures, tooling components, and parts with features on multiple sides |
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Which Sectors Use Plastic Machining in Atlanta, GA?
Across multiple sectors, Roberson Machine Company’s industrial machining capabilities support plastic parts used in production systems, tooling, finished products, and larger assemblies.
- Aerospace: For parts that do not require metal, machined plastic parts can replace metal components to reduce the weight of fixtures, instrument hardware, insulating components, and similar parts.
- Medical: Manufacturers select clear, nonconductive, or chemically resistant plastics for plastic medical components used in diagnostic systems, fixtures, and parts exposed to repeated cleaning.
- Automotive and EV: Machined plastics support electrical isolation, resistance to automotive fluids, and low-friction movement in vehicles, test systems, and manufacturing equipment.
- Packaging: Plastic machining produces wear-resistant guides, changeover tools, and handling components for packaging equipment operating through repeated cycles.
- Automation and Robotics: Automation systems use plastic tooling to limit moving weight and guides or wear surfaces to reduce friction during continuous operation.
- Oil and Energy: Plastics selected for chemical and corrosion resistance support energy equipment exposed to moisture, fluids, electrical components, and demanding service conditions.
Material selection depends on the component’s load, movement, temperature, chemical exposure, electrical requirements, and service environment.
What Types of Plastic Can Be CNC Machined?
A wide range of thermoplastics and engineering plastics can be CNC machined from common stock forms, including sheet, plate, block, rod, and tube. The right plastic for CNC machining varies by application, although manufacturers regularly use several common material families.
Acetal and Nylon
Acetal combines low friction and wear resistance with limited moisture absorption, supporting parts that need dimensional stability.
Nylon combines durable, abrasion-resistant performance with greater moisture absorption that can affect dimensional stability.
Acrylic and Polycarbonate Materials
Acrylic materials (like plexiglass) combine optical clarity and surface hardness for instruments, windows, covers, and displays. Polycarbonate also provides transparency with greater impact resistance for guards, housings, and frequently handled parts.
PTFE and UHMW
PTFE and UHMW offer low friction for different industrial uses:
PEEK and Other High-Performance Plastics
PEEK combines chemical resistance with useful mechanical performance at demanding temperatures.
The higher cost of PEEK may be justified when standard engineering plastics cannot meet the application’s performance requirements.
Manufacturers may also machine ABS, polypropylene, polyethylene, PVC, and other plastics when their properties match the component requirements. Differences in grade, additives, reinforcement, and stock condition influence both machinability and finished-part performance.
Repeat Production and High-Volume Plastic Machining
High-volume plastic machining in Atlanta, GA, uses consistent CNC methods to support higher-volume releases and recurring orders of machined plastic parts. As a project moves through production ramp-up, the challenge becomes repeating the approved material, setup, dimensions, and finished quality across larger production quantities.
Planning repeat orders and larger production releases may include:
- Material supply: Maintaining the specified resin, grade, stock form, and relevant material documentation across production releases.
- Documented setups: Capturing the workholding method, tooling, machining parameters, and part position for later production runs.
- Tool-life planning: Monitoring tool condition and replacement intervals before wear affects dimensions or finished surfaces.
- Production inspection: Establishing first-piece, in-process, and final inspection requirements based on the part and quantity.
- Revision control: Keeping drawings, programs, inspection records, and approved changes connected to the correct production release.
These controls support consistency and precision in mass-production CNC machining while reducing the need to rebuild the production plan each time an order returns.
FAQs About Atlanta, GA, Plastic Machining
How do manufacturers choose between plastic machining and molding?
CNC machining often makes more sense for prototypes, changing designs, and components with features that do not suit a molded process. Because machining does not require a dedicated mold, production can begin without a separate tooling design and testing stage.
A stable design and sufficiently high order volume may allow molding’s lower per-part cost to justify the initial tooling investment. Larger quantities may remain appropriate for CNC machining when part features or material requirements do not fit a molded process.
What details are needed for a plastic machining quote in Atlanta, GA?
A drawing or digital model provides the clearest starting point for quoting a plastic machining project. Important quoting details include:
- Overall part size and specified features
- Critical dimensions and permitted variation
- Plastic resin and grade
- Initial quantity and expected repeat orders
- Required surface finish and edge condition
- Required threads, inserts, and mating components
- Required inspections and supporting documentation
- Target production and delivery timing
If material selection is part of the project, describe the component’s function, environment, and exposure to chemicals, moisture, electricity, temperature, or mechanical loads.
How are plastic machining costs calculated in Atlanta, GA?
Material choice, stock size, order quantity, setup complexity, machining time, and inspection requirements all affect plastic machining costs. High-performance plastics such as PEEK may also be substantially more expensive than general engineering plastics.
Simple parts made from common stock typically cost less than thin-walled or multi-sided components requiring specialized fixtures, close tolerances, and multiple operations.
How tightly can plastic parts be machined?
Practical machining tolerances vary with the selected plastic, part size, feature thickness, stock condition, and service conditions. Machining and inspection results can be affected by temperature changes, moisture, internal material stress, and the pressure used to hold the part.
Specified tolerances should reflect how the component functions rather than expectations carried over from metal parts. Part drawings should clearly mark the dimensions and features that influence fit, sealing, alignment, motion, or assembly.
How do I choose a plastic for CNC machining?
A material that works well for one CNC project may not suit another. The appropriate choice generally meets the component’s functional requirements without introducing unnecessary performance or material cost.
Stable, low-friction applications frequently use acetal as a practical material option. Parts exposed to abrasion or demanding use may benefit from nylon’s toughness. Acrylic and polycarbonate serve many transparent applications, whereas PTFE, UHMW, and PEEK suit components with more specialized needs. The specific resin grade and included additives also influence material performance.
When can plastic parts replace metal components in Atlanta, GA?
Plastic can replace metal when lower weight, electrical insulation, reduced friction, or resistance to corrosion and chemicals better serves the application. The existing metal design may need to change before it can perform effectively in plastic.
The material substitution should consider:
- Mechanical loads and impact
- Service temperatures and chemical contact
- Friction, wear, and required service life
- Dimensional changes from heat or moisture
- Wall thickness, fastening, and structural support
Rather than copying the metal component directly, the design may need to be revised around the plastic’s properties.
Work With Roberson Machine Company for Plastic Machining in Atlanta, GA
Roberson Machine Company produces plastic components from customer drawings, digital models, and specifications for prototypes, replacement needs, and scheduled production.
- Plastic machining plans reflect the material and intended use, with machining and inspection planned around the resin, stock form, functional features, and expected service conditions.
- The complete component can move through multiple CNC processes when the design combines milled, turned, drilled, threaded, or multi-sided geometry.
- New parts can move from prototype machining into recurring production with setup documentation and inspection planning carrying the approved process into repeat orders.
Provide your drawing, digital model, material requirements, order quantity, and target delivery date. Call 573-646-3996 or contact Roberson Machine Company online to begin a plastic machining project in Atlanta, GA.