Manufacturers use plastic machining in Wausau, WI, to produce durable, lightweight parts with properties such as chemical resistance, electrical insulation, and low friction. Machined plastic components can handle many functions commonly assigned to metal parts while reducing weight and, in suitable applications, production costs.
At Roberson Machine Company, we produce plastic parts for prototype development, component replacement, recurring high-volume orders, and integration into larger equipment.
Learn More About
- What plastic machining does for parts produced from solid stock
- How heat, workholding, and material behavior shape the machining plan
- Which CNC processes create different plastic parts and features in Wausau, WI
- Where machined plastic components are used across industrial operations
- How common plastics compare by material properties and applications
- How process planning supports higher quantities and repeat orders
- Common questions about pricing, materials, and production decisions
For precision plastic machining in Wausau, WI, contact us online or call 573-646-3996 to discuss the part requirements and planned production schedule.
Understanding the Plastic Machining Process
Plastic machining is a subtractive manufacturing process that removes material from solid plastic stock to produce a finished component. Based on a drawing or digital model, CNC equipment follows programmed cutting paths until the component reaches its required shape and dimensions.
Machined plastic parts may begin as sheets, plates, blocks, rods, or tubes. Direct machining avoids dedicated molding tools and allows manufacturers to revise part designs without creating a new mold.
How Is Machining Plastic Different From Machining Metal?
Many CNC processes used to machine metal components can also produce plastic parts. The materials differ primarily in their responses to heat, cutting forces, workholding pressure, and environmental changes.
Managing Heat During Plastic Machining
Most plastics conduct heat less efficiently than metals, so temperatures may increase quickly near the cutting tool. Excessive heat can damage the material through melting, burning, softening, or dimensional distortion.
Proper chip evacuation helps protect the quality of the machined surface. Chips that remain around the tool can trap heat and disrupt cutting, leading to burrs, fuzzy edges, cracks, or other defects.
Workholding Without Part Distortion
The stock must be held firmly enough for machining without pressure that damages or deforms the material. The machining approach may need to address:
- Movement in thin walls and unsupported features during cutting
- Large or low-stiffness parts that may bow under pressure
- Material movement related to temperature changes, moisture absorption, and internal stresses
Matching the Process to the Plastic
Tooling and cutting parameters affect acrylic, nylon, acetal, PEEK, PTFE, UHMW, and other plastics in different ways. The specific resin, material grade, and intended operating environment guide both machining and inspection decisions.
What CNC Processes Are Used to Machine Plastic Parts in Wausau, WI?
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 Industries Use Machined Plastic Parts in Wausau, WI?
Through its industrial machining capabilities, Roberson Machine Company produces plastic components for production equipment, tooling, products, and assemblies serving several industries.
- Aerospace: In suitable applications, machined plastic parts can replace metal components in fixtures, instrument hardware, insulators, and other parts where reduced weight matters.
- Medical: Diagnostic equipment, specialized fixtures, and repeatedly cleaned applications may use plastic medical components selected for clarity, electrical insulation, or resistance to chemicals.
- Automotive and EV: Within vehicles, testing systems, and production equipment, plastic parts can isolate electrical components, resist fluids, and reduce friction between moving surfaces.
- 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: Oil and energy equipment uses machined plastics where corrosion resistance, chemical compatibility, or electrical insulation affects material performance.
Operating loads and movement help define material requirements along with temperature, chemical exposure, electrical properties, and the broader service environment.
Which Plastics Can Be CNC Machined?
Sheet, plate, block, rod, and tube stock provide machinable forms for many thermoplastics and engineering plastics. Choosing the best plastic for CNC machining depends on the application, though several material groups are common in industrial parts.
Acetal and Nylon Materials
Acetal absorbs relatively little moisture and offers low friction and wear resistance, making it useful for parts that must maintain stable dimensions.
Nylon provides toughness and abrasion resistance but generally absorbs more moisture, which can affect dimensional stability.
Acrylic and Polycarbonate
The optical clarity and surface hardness of acrylics (like plexiglass) support instruments, protective covers, windows, and display parts. Polycarbonate provides clear visibility and increased impact resistance for guards, housings, and components used or handled repeatedly.
PTFE and UHMW Materials
These low-friction materials suit different industrial applications:
PEEK and High-Performance Plastics
PEEK combines chemical resistance with useful mechanical performance at demanding temperatures.
Its higher material cost generally makes sense when the application requires performance that standard engineering plastics cannot provide.
ABS, polypropylene, polyethylene, PVC, and other plastics may also be machined when their properties suit the component. Machining behavior and in-service performance may change with the resin grade, additives, reinforcement, and condition of the stock.
High-Volume Plastic Machining for Repeat Production
High-volume plastic machining in Wausau, WI, produces larger part quantities and repeat orders from plastic stock through controlled CNC processes. As a project moves through production ramp-up, attention expands beyond the initial part to maintaining material, setup, dimensional, and finish consistency at greater volumes.
Preparing for larger quantities and recurring orders may involve:
- Material supply: Keeping the specified resin, grade, stock form, and supporting material documentation consistent between production releases.
- Documented setups: Capturing the workholding method, tooling, machining parameters, and part position for later production runs.
- Tool-life planning: Replacing tools at planned intervals before wear creates dimensional changes or finish defects.
- Production inspection: Using the part requirements and quantity to determine appropriate first-piece, in-process, and final inspections.
- Revision control: Confirming that production uses the correct drawings, programs, inspection records, and authorized changes.
These controls support consistency and precision in mass-production CNC machining by maintaining an established production approach across recurring orders and larger releases.
FAQs About Wausau, WI, Plastic Machining
Which plastic parts are better suited to CNC machining than molding?
CNC machining often makes more sense for prototypes, changing designs, and components with features that do not suit a molded process. Manufacturers can produce the part without first investing time and money in mold design, manufacturing, and testing.
Larger production quantities can make molding more economical once the design is stable and lower unit costs recover the initial tooling expense. Higher-volume parts may still require CNC machining because of their geometry, material, tolerances, or required secondary features.
How do I request a quote for a machined plastic part in Wausau, WI?
Quoting begins most clearly with a drawing or digital model of the plastic component. Additional project details include:
- Overall dimensions and required features
- Key dimensions and allowable tolerances
- Plastic resin and grade
- Starting quantity and anticipated repeat orders
- Finish requirements and acceptable edge condition
- Required threads, inserts, and mating components
- Inspection and documentation needs
- Requested delivery schedule
If the material has not been selected, describe the part’s function, service conditions, and exposure to chemicals, moisture, or electrical systems.
How are plastic machining costs calculated in Wausau, WI?
The cost of plastic machining reflects the selected material, stock dimensions, quantity, setup requirements, machining time, and inspection plan. PEEK and similar high-performance plastics generally cost more than standard engineering materials.
Parts become more expensive as thin walls, multiple sides, precise dimensions, and specialized workholding add complexity to the machining process.
What affects achievable tolerances in plastic machining?
The plastic grade, part dimensions, wall thickness, starting stock, and operating environment all influence practical tolerance limits. Machining and inspection results can be affected by temperature changes, moisture, internal material stress, and the pressure used to hold the part.
Functional requirements should guide tolerance selection because values used for metal parts may not suit plastic components. The drawing should distinguish the features and dimensions that directly control fit, sealing, alignment, movement, and assembly.
How do I choose a plastic for CNC machining?
No one plastic provides the best option for every CNC machining project. Material selection should match the part’s required performance while avoiding capabilities and costs that provide no benefit to the application.
For stable parts with low-friction requirements, acetal often provides a balanced material choice. Nylon may better suit parts that need toughness and abrasion resistance. Acrylic and polycarbonate provide options for clear components. PTFE, UHMW, and PEEK support more specialized operating requirements. Performance may vary based on the selected grade, reinforcement, fillers, or other additives.
Can Wausau, WI, machined plastic parts replace metal components?
A machined plastic component may replace metal when its lower weight, insulating properties, friction characteristics, or corrosion resistance offer an advantage. The plastic version may not use the same design as the original metal component.
Important replacement-design factors include:
- Applied loads and potential impact
- Service temperatures and chemical contact
- Friction, wear, and required service life
- Changes caused by heat or moisture
- Wall thickness, fastening, and structural support
A successful replacement may depend on adapting the original geometry to the behavior of the selected plastic.
Request Plastic Machining Support in Wausau, WI
Roberson Machine Company works from customer drawings, digital models, and part specifications to produce plastic components for prototypes, replacement applications, and recurring production.
- The selected plastic and intended use guide production planning, accounting for how material grade, stock geometry, important features, and service conditions influence production and inspection.
- Complex plastic parts may require several CNC operations when a single part includes features that require different machining operations.
- New parts can move from prototype machining into recurring production with documented setups and inspection plans supporting future orders.
Share the component drawing or model, specified plastic, required quantity, and production schedule with our team. For plastic machining support in Wausau, WI, call 573-646-3996 or send Roberson Machine Company a message online.