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Custom Engineering Plastic Machining: Services, Capabilities & Lead Times
Types of Custom Machining Services
CNC Milling
CNC milling is the most common method for machining engineering plastics. It’s ideal for producing flat surfaces, pockets, slots, and complex 2.5D geometries from PEEK sheets or blocks.
Capabilities:
3-axis, 4-axis, and 5-axis milling
Tolerances: ±0.05mm (standard), ±0.02mm (precision)
Surface finish: Ra 0.8-3.2μm (material-dependent)
Maximum part size: 600mm × 400mm × 300mm (typical)
CNC Turning
CNC turning produces cylindrical parts from plastic rods, including bushings, sleeves, seals, and precision spacers.
Capabilities:
· Tolerances: ±0.03mm (standard), ±0.01mm (precision)
· Surface finish: Ra 0.4-1.6μm
· Maximum diameter: 300mm
· Maximum length: 500mm
Waterjet Cutting
Waterjet cutting is ideal for cutting complex 2D profiles from sheets without inducing thermal stress — critical for heat-sensitive materials like PEEK and POM.
· Tolerance: ±0.15mm
· No heat-affected zone
· Material thickness: up to 100mm
· Ideal for prototypes and low-volume production
Material-Specific Machining Considerations
PEEK Machining
PEEK CNC machining requires sharp carbide tools, controlled feed rates, and effective cooling. PEEK‘s high melting point (343°C) means it can tolerate higher cutting speeds than other engineering plastics, but thermal expansion must be managed for tight tolerances.
POM Machining
POM is one of the easiest engineering plastics to machine. It produces clean chips, achieves excellent surface finishes, and tolerates a wide range of cutting parameters. POM is ideal for high-volume machined parts.
PPS Machining
Glass-filled PPS (PPS GF40) is abrasive and requires carbide or diamond-coated tools. Tool wear is significantly higher than unfilled grades. Expect 30-50% shorter tool life.
PEI Machining
PEI (ULTEM) machines similarly to PEEK but is slightly more brittle. Sharp tools and conservative feed rates prevent chipping and delamination.
Lead Times for Custom Machined Parts
Complexity | Typical Lead Time | Notes |
Simple (1-2 features) | 5-7 business days | From stock material |
Moderate (multiple features) | 7-14 business days | Common for most parts |
Complex (5-axis, tight tolerance) | 14-21 business days | May require special tooling |
High-volume (100+ pieces) | 3-6 weeks | Batch processing |
Lead times assume material is in stock. For exotic grades or large sizes, add material procurement time of 1-3 weeks.
Cost Factors for Custom Machining
1. Material cost: The raw stock shape price (see PEEK cost factors)
2. Machining time: Charged per hour, typically USD 40-80/hour in China
3. Setup cost: One-time charge for programming and fixturing
4. Tooling: Special tools for abrasive materials like PPS GF40
5. Finishing: Polishing, deburring, or special surface treatments
6. Inspection: CMM measurement, dimensional reports, material certificates
How to Request a Custom Machining Quote
To get an accurate quote quickly, provide:
7. 3D CAD model (STEP, IGES, or STL format)
8. 2D drawing with tolerances and surface finish callouts
9. Material specification (grade, color, certification)
10. Annual quantity estimate
11. Any special requirements (sterilization, traceability, packaging)
See our guide on how to request a quote for engineering plastic materials for a step-by-step process.
FAQ
Q1: What tolerances can be achieved with CNC machining of engineering plastics?
Standard CNC milling achieves ±0.05mm, precision ±0.02mm. CNC turning achieves ±0.03mm standard, ±0.01mm precision.
Q2: How long does custom plastic machining take?
Lead times range from 5-7 days for simple parts to 14-21 days for complex parts. High-volume orders require 3-6 weeks.
Q3: Which engineering plastics are easiest to machine?
POM is the easiest. PEEK and PEI machine well with proper parameters. Glass-filled PPS is the most challenging.
Ready to source quality engineering plastics? Contact NAGOMER today for a free quote, or browse our PEEK sheets, POM rods, and ESD materials.
NAGOMER — Professional Engineering Plastics Solutions
www.nagomer.com | info@nagomer.com