CNC Milling (3-, 4-, 5-Axis)

Multi-axis CNC milling handles complex contours, pockets and sculptured surfaces in PEEK. 3-axis work holds ±0.01 mm on simple planar features; 5-axis simultaneous machining achieves ±0.005 mm on turbine vanes, impellers and medical housings by eliminating multiple setups.

Part envelopes range from 10 mm cubes to 500+ mm enclosures. Ideal for prototypes, low-volume tooling inserts and aerospace brackets where undercuts and compound angles dominate.

Precision Turning and Swiss-Type Machining

CNC turning produces micro-shafts, pins and bushings with diameters from 0.5 mm to 200 mm, holding ±0.005 mm on length and ±0.003 mm on diameter. Swiss-type lathes excel at Ø < 20 mm parts requiring ±0.002 mm positional accuracy — common in micro-connector terminals and medical catheter components.

EDM Wire-Cutting and Surface Finishing

Slow-wire EDM cuts intricate PEEK profiles — slots, keyways, gear teeth — without mechanical stress, achieving ±0.002 mm positioning and corner radii ≤ R0.015 mm. Precision grinding and lapping deliver Ra < 0.2 µm mirror finishes on sealing faces, optical mounts and sliding bearings, critical for fluid-handling and cleanroom assemblies.

How Filler Content Affects Tool Wear and Finish

Glass and carbon fibers increase abrasiveness by 200–300%, accelerating carbide insert wear and raising tool-change frequency. Unfilled PEEK 450G machines cleanly at Ra ≤0.4 µm with standard tooling, while 30% glass-filled grades demand coated carbide or PCD inserts to maintain Ra ≤0.8 µm over production runs.

PTFE and graphite fillers act as internal lubricants, reducing cutting forces by ~15% and enabling faster feeds without compromising surface integrity. XUXIANG’s ZEISS MICURA CMM verifies dimensional hold across all grades to ±0.001 mm, compensating for filler-induced thermal expansion during high-speed CNC cycles.

Laser Marking for Traceability

Laser marking etches serial numbers, lot codes, 2D DataMatrix and company logos directly onto PEEK surfaces without chemical residue. Medical-device and aerospace customers rely on permanent, high-contrast marks that survive autoclaving, gamma sterilization and thermal cycling.

XUXIANG’s fiber-laser marking achieves 0.02 mm character height with minimal heat-affected zones, preserving PEEK’s mechanical properties and meeting FDA UDI and aerospace AS9100 traceability mandates.

Plasma Coating and Surface Treatments

PEEK’s inherent chemical inertness hinders adhesive bonding and overmolding. Plasma surface treatment oxidizes the top 5–10 nm, raising surface energy from ~40 mN/m to >60 mN/m and enabling reliable epoxy, silicone or polyurethane bonds.

Plasma activation adds 1–2 days to lead time and approximately 5–8 % to part cost, yet it is essential for hybrid assemblies in catheter hubs, sensor housings and sealed enclosures.

Ultrasonic Cleaning and Assembly

Ultrasonic cleaning in deionized water or isopropanol removes sub-micron machining oils, chips and particulates to ISO Class 7 cleanroom standards. Medical implants and semiconductor jigs require validated cleaning with certificates of cleanliness.

Press-fit brass inserts, adhesive bonding and sub-assembly services consolidate your supply chain. XUXIANG provides FAI documentation, material certificates and traceability labels in one package, reducing your inbound inspection overhead by an estimated 30 %.

Incoming Material Certification and Traceability

Every PEEK resin lot arrives with a mill certificate documenting melt-flow index, moisture content (≤0.02% before machining) and glass-transition temperature. XUXIANG logs resin lot numbers against job travelers so that any dimensional anomaly can be traced back to raw-material variance, not process drift.

Climate-Controlled Machining Environment

PEEK expands ~47 µm/m/°C; a 2°C shop-floor swing moves a 100 mm feature by nearly 10 µm. ISO-class temperature control at 20 ± 1°C holds thermal expansion below measurement noise, letting ZEISS MICURA CMM readings reflect true geometry rather than ambient drift.

In-Process CMM and Tool-Wear Monitoring

GD&T verification occurs mid-cycle on ZEISS or Nikon coordinate measuring machines calibrated to 0.7 µm resolution. Simultaneously, tool-wear logs flag insert degradation before edge radius grows beyond the ±0.002 mm slow-wire window, preventing tolerance creep across multi-hundred-piece runs.

Sharp Tooling and Reduced Feed Rates

PEEK’s thermal insulation traps cutting heat at the tool-chip interface; dull edges or aggressive feeds melt the resin rather than shearing it, causing delamination and micro-voids. Sharp carbide inserts, flood coolant and feed rates 30–50% slower than aluminum preserve surface integrity and hold corner radii ≤ R0.015 mm without thermal damage.

Equipment and PEEK-Specific Machining Experience

Confirm the shop operates 5-axis CNC and Swiss-type lathes capable of holding ±0.005 mm or tighter on PEEK; general 3-axis mills cannot achieve the geometric complexity medical and aerospace parts demand. Ask how many years they have machined PEEK specifically — tooling wear rates, feed speeds and coolant strategies differ sharply from commodity plastics.

Certifications and Industry Compliance

Request ISO 9001:2015 as baseline, ISO 13485 for medical devices and AS9100 for aerospace applications. These standards govern traceability, material certificates and process validation — non-negotiable for regulated end markets.

In-House Metrology and Engineering Support

Verify CMM (ZEISS or equivalent) and optical comparator access for first-article inspection. Evaluate whether the provider offers DFM reviews, material-grade substitution advice and tolerance optimization — engineering collaboration reduces costly redesigns and shortens lead times by 20–30 percent.

Specifying Tighter Tolerances Than Functionally Necessary

Calling out ±0.005 mm when ±0.02 mm will perform identically raises machining cost by 40–70 percent and extends lead time by one to two weeks. Over-tolerance forces slow-wire EDM or multi-pass grinding where standard CNC would suffice.

XUXIANG’s DFM team reviews every drawing before quoting, flagging non-critical dimensions that can relax without compromising fit or function. Accepting those recommendations typically cuts piece price by 20–35 percent while preserving delivery speed.

Ignoring Material Anisotropy from Extrusion Direction

PEEK rod and plate are extruded, yielding 5–10 percent higher tensile strength parallel to flow versus perpendicular. Buyers who omit grain-direction callouts risk warpage under thermal cycling or premature crack propagation in high-stress zones.

XUXIANG orients critical features along the extrusion axis and documents grain direction on inspection reports, ensuring dimensional stability across temperature swings common in automotive and medical applications.

Failing to Define Surface-Finish Requirements

Print notes reading ‘smooth finish’ leave Ra interpretation to the shop, causing reject loops when delivered parts measure Ra 0.8 µm but the assembly needs Ra 0.4 µm for sealing. Rz peak-valley specs matter equally for O-ring grooves and bearing surfaces.

XUXIANG requests explicit Ra and Rz values during quote review. Mirror-grade EDM achieves Ra 0.1 µm; precision grinding delivers Ra 0.2–0.4 µm; standard CNC yields Ra 0.8–1.6 µm — each with corresponding cost and cycle-time implications.

Underestimating Lead Time for First-Article Inspection

ZEISS CMM validation, material spectral analysis and full-dimensional FAI reports require three to five working days beyond machining. Buyers who compress schedules skip verification, shipping non-conforming parts that fail at the customer’s incoming QC.

XUXIANG builds FAI into every new-part timeline, issuing certificates traceable to ISO 9001:2015 procedures and enabling design iteration before volume release.

Choosing the Lowest Bidder Without Validating Process Controls

A 15 percent price advantage disappears when scrap rates climb above 8 percent or when rework delays assembly by two weeks. Shops lacking CMM capability, documented tool-change intervals or environmental controls cannot hold PEEK’s tight tolerances consistently.

XUXIANG publishes equipment lists — Sodick EDM, ZEISS MICURA CMM, Nikon microscopes — and invites factory audits, ensuring buyers see calibration records and five-step QC workflows before placing orders.

Concept and Material Feasibility Study

Confirm PEEK grade compatibility with thermal, chemical and mechanical requirements. XUXIANG’s engineering team reviews application environment, operating temperature range and regulatory constraints (FDA, UL94, biocompatibility) to recommend virgin, glass-filled or carbon-reinforced variants. Typical duration: 3–5 days.

3D CAD and Tolerance Stack-Up Analysis

Submit STEP or IGES files for DFM review by 10+ engineering experts. Stack-up analysis identifies critical dimensions, fits and GD&T callouts that drive machining strategy. Early collaboration flags cost drivers — thin walls, deep pockets, tight corner radii — before toolpath programming begins. Timeline: 5–7 days.

Prototype Machining and Dimensional Validation

Machine 1–3 prototypes on Sodick or Fanuc CNC centers, then validate on ZEISS MICURA CMM (0.7 µm resolution). Dimensional reports confirm ±0.001 mm achievability and surface finish meets Ra specifications. Typical lead time: 7–10 days for complex geometries.

First-Article Inspection and Material Testing

FAI documentation includes full CMM reports, material certificates and spectral analysis. Optional third-party testing (tensile, flexural, flammability) adds 10–15 days but de-risks regulatory submissions for medical and automotive applications.

Pilot Run and Process Optimization

Produce 10–50 pieces to validate repeatability, tool wear and cycle time. SPC data collection begins; process parameters are locked. Duration: 10–14 days, depending on part complexity and secondary operations.

Full Production Release with Ongoing SPC

Launch volume production with in-process monitoring and periodic CMM audits. XUXIANG’s five-step QC flow — material check, in-process tolerance, CMM verification, surface integrity, final FAI — ensures sustained micron-stable precision. Lead time typically 30% faster than industry average.