High-Precision Copper CNC Machined Parts Supplier
Overview
Precision copper machining is difficult because large flat surfaces distort easily, contact-face roughness must be graded by function, and pure copper tends to smear under cutting pressure.
XCM CNC works under ISO 9001 and IATF 16949 systems and uses equipment such as DMG 80mono and Matsuura MX-520 to control flatness around 0.02 mm and selected critical dimensions around +/-0.003 mm. MOQ can start from 1 piece and standard lead time is commonly reviewed in the 10-15 day range. For copper base plates, heat sinks, electrodes, and waveguide structures, GD&T datums, roughness grades, and reinspection before and after surface treatment are defined before machining starts.
Key Capabilities
Machining Parameters and Tolerances
- Materials: C101 (oxygen-free copper), C102 (oxygen-free copper), C110 (electrolytic tough pitch copper)
- Tolerance: +/-0.003 mm (+/-0.00012 inch), IT5 or IT6 accuracy, +/-0.01 mm shaft/bore fits; h6/H7 available
- Surface Finish: Ra 3.2 um milled faces, Ra 1.6 um contact surfaces, Ra 0.8 um turned OD, Ra 0.4 um ground datum faces
- GD&T: Coaxiality 0.012 mm, runout 0.01 mm, flatness 0.02 mm, position 0.015 mm, cylindricity 0.011 mm
- Max Size: 3-axis milling travel 3000 x 1600 x 1400 mm; turning diameter 1250 x length 2000 mm
- Surface Treatment: Anti-oxidation protection, nickel plating, tin plating, passivation by order review
- Thread: Internal M1.4-M220, external M2.0-M220, depth 4xD; NPT / BSP / G / PT pipe threads
- Precision Limit: Flatness 0.02 mm on 1030 x 1030 mm area, roundness 0.006 mm, position 0.015 mm (specific features, by drawing review)
Flatness and Parallelism Limits for Large Heat Sink Surfaces
Large copper base plates are limited by area, thickness, and clamping strategy. XCM CNC can review flatness around 0.02 mm and parallelism around 0.03 mm over a 1030 mm datum length on parts up to about 1030 x 1030 mm when the structure supports it. Thin-wall heat-spreader sections near 0.5 mm still need deformation review, and the real tolerance window is confirmed part by part against area and wall condition.
Full GD&T Control for Terminals, Shafts, and Electrode Features
Precision copper parts can be reviewed for coaxiality around 0.012 mm, circular runout around 0.01 mm, grouped-hole position around 0.015 mm, and roundness around 0.006 mm. Shaft fits can follow h6 around +/-0.005 mm and bores can follow H7 around +/-0.006 mm. Because pure copper is prone to smearing, the finish route and tool condition are managed closely so contact faces do not get damaged before GD&T inspection.
Surface Roughness Grading for Contact, Datum, and General Machined Faces
Roughness must be assigned by function rather than one level for the entire part. General milled faces can stay at Ra 3.2 um, contact and installation faces can move to Ra 1.6 um, ground datum faces can reach Ra 0.4 um, and turned outer diameters can reach Ra 0.8 um. RF cavities and precision contact faces are called out separately so unnecessary finish time is avoided on non-critical regions.
Precision Inspection with CMM, Vision Systems, and Roughness Testing
Inspection can cover size, GD&T, and surface state together using Hexagon CMM, a WanHao VMS vision system, a TRIMOS height gauge, and a roughness tester. Flatness and position are checked on CMM, bores can be verified with gauges, and roughness is measured instrumentally instead of by visual comparison. Key dimensions are checked both before and after anti-oxidation treatment or plating when required.
Specifications
| Product Name | High-Precision Copper CNC Machined Parts |
|---|---|
| Manufacturer | XCM CNC |
| Factory Location | Shenzhen, Guangdong, China |
| Quality System | ISO 9001, ISO 13485, IATF 16949, GJB9001C |
| Machining Process | Precision CNC milling, CNC turning, drilling, boring, grinding, finish machining |
| Material | Copper |
| Material Grade | C101, C102, C110 selected by conductivity, thermal transfer, and anti-oxidation requirement |
| Tolerance | +/-0.03 mm standard CNC tolerance, critical dimensions by drawing review |
| Precision Tolerance | +/-0.003 mm for selected contact features after review |
| Surface Roughness | Ra 1.6 um contact surfaces, Ra 0.4 um ground flat faces, Ra 0.8 um turned outer diameters |
| Surface Treatment | Anti-oxidation protection or plating after precision machining by order review |
| Inspection | Hexagon CMM, WanHao VMS-3020G, TRIMOS 600L, and roughness tester by order requirement |
| Application | Heat sink bases, waveguide cavities, terminals, electrodes, and conductive connection blocks |
| Key Features | Large flat faces, contact surfaces, terminal holes, waveguide cavities, and copper-smearing control |
| Critical QC Requirements | Flatness, roughness, hole inspection, post-treatment recheck, and CMM reporting |
| Batch Range | Prototype to repeat precision batches by drawing review |
| MOQ | 1 Piece |
| Typical Lead Time | 10-15 business days after drawing review |
| Drawing Formats | STEP, IGS, DWG, PDF, X_T |
| Critical Tolerance Control | Contact faces and large flat datum surfaces reviewed before surface protection |
Applications
High-Precision Thermal Bases, Copper Plates, and Heat Spreaders
Typical Parts: Thermal base, copper base plate, heat spreader
Precision copper thermal parts focus on large-face flatness and contact-surface roughness. Flatness can be reviewed around 0.02 mm over large areas, contact faces can be milled to Ra 1.6 um, and clamping deformation is managed through staged machining and stress review.
RF Connectors, Waveguide Cavities, and Conductive Structures
Typical Parts: RF connector, waveguide cavity, high-frequency conductive block
Waveguide cavities and RF connectors focus on cavity profile and contact-face condition rather than a default RF performance claim. Profile around 0.02 mm, key-surface roughness around Ra 0.8 um, and connector-hole position around 0.015 mm can all be validated before the production route is released.
High-Conductivity Terminals, Busbar Connectors, and Electrodes
Typical Parts: High-conductivity terminal, busbar connector, copper electrode
These parts need controlled fit grades and conductive-face geometry. Bores can be reviewed to H7 around +/-0.006 mm, contact features to around +/-0.003 mm, and coaxiality to around 0.012 mm, with CMM and gauge checks on the same critical features after machining.
Slip Rings, Electrodes, and Thermal Components for Automation
Typical Parts: Conductive slip ring, automation electrode, thermal component
Automation copper parts often combine conductivity and heat-transfer requirements, which means assembly bores, contact faces, and outer-diameter geometry all need coordinated control. Circular runout around 0.01 mm and h6 shaft fits can be reviewed, with key dimensions rechecked again after anti-oxidation treatment.
Why Choose Us
Certified Systems and Equipment Coverage
The factory works under ISO 9001, ISO 13485, IATF 16949, and GJB9001C quality systems and uses DMG, Mazak, Matsuura, Brother, and other machines to cover pure copper, oxygen-free copper, and conductive structural parts. Drawing review can confirm contact faces, flatness, and anti-oxidation requirements in one flow.
Broad Size Coverage
The machining range covers both connector-scale parts and larger copper base plates or structures. Three-axis travel reaches 3000 x 1600 x 1400 mm and turning diameter reaches 1250 mm, while the final route still depends on fixturing, purity level, and surface-state requirements.
Tiered Equipment Strategy for Cost and Quality
XCM CNC uses a mix of mainland China, Taiwan, Japan, and Europe or US sourced CNC machines. Lower-tolerance copper operations can run on domestic or Taiwan equipment, while tighter contact faces and fit features can move to imported machines such as DMG or Mazak.
Inspection Methods Configured Before Cutting Starts
Contact faces, H7 or H8 bores, and other key copper features need their inspection method defined before machining starts. Flatness and position are assigned to CMM, smaller contours to the 2.5D vision system, and height dimensions to the TRIMOS gauge, then that route is written into the process file rather than decided after machining.
Two-Stage Reinspection Before and After Surface Treatment
Anti-oxidation protection and plating change the state of copper contact faces and fit dimensions, so XCM CNC checks the critical geometry once after precision machining and again after surface treatment. The comparison between those two inspections confirms whether the treatment route has shifted the part out of tolerance.
FAQ
What precision tolerance can you achieve on copper CNC parts?
Selected small critical features under 100 mm can reach around +/-0.003 mm, fit bores can follow H7 around +/-0.006 mm, and shaft fits can follow h6 around +/-0.005 mm. Larger copper parts above 500 mm usually move to a wider standard window and still need structure and fixturing review.
Why is pure copper harder to machine than brass?
Pure copper is more likely to smear on the cutting edge, distort under clamping, and mark sensitive contact faces, so the process route is usually more conservative than brass. Extra stock and staged cutting are reviewed according to part size, flat faces, and hole requirements.
What GD&T parameters can you control on copper precision parts?
Typical values include coaxiality around 0.012 mm, circular runout around 0.01 mm, position around 0.015 mm, flatness around 0.02 mm, roundness around 0.006 mm, and cylindricity around 0.011 mm. Whether a specific value applies still depends on size, datum strategy, and inspection route.
What inspection equipment do you use for precision copper parts?
The main inspection set can include Hexagon Inspector Classic 06.08.06 CMM, WanHao Rational VMS-3020G 2.5D vision inspection, TRIMOS 600L height gauges, and roughness testers. Flatness and position are checked by CMM, bores by gauges, and roughness by instrument measurement.
Can you control flatness and roughness on copper heat-sink or contact faces?
Yes. Flatness can be reviewed around 0.02 mm on large areas up to about 1030 x 1030 mm, ground datum faces can reach Ra 0.4 um, and contact faces can be milled to Ra 1.6 um. The actual result still depends on area, thickness, and clamping strategy.
How do you recheck precision copper parts after anti-oxidation or plating?
Critical contact faces and fit dimensions are checked once after precision machining and again after surface treatment, with both data sets compared to confirm that the treatment route did not move the part out of tolerance. Report format can follow the customer template.
Request a CNC Machining Quote from XCM CNC
Send us your drawings. Our team will review the file and reply with a machining quote. MOQ: 1 piece, with competitive low-cost pricing.
Email: [email protected] | WhatsApp: +8618638951317
