High-Precision Aluminum CNC Machined Parts Supplier
Overview
XCM CNC provides high-precision aluminum CNC machining focused on dimensional control, fixturing strategy, and inspection discipline for parts that require accurate heat transfer faces, thin-wall cavities, hole pattern location, and precision assembly datums.
Aluminum offers heat dissipation, low weight, and anodizing advantages, but thermal distortion and coating thickness compensation must be reviewed early. We use CMM, vision inspection, height gauges, and roughness testing to confirm whether critical dimensions stay within tolerance and whether post-treatment features need reinspection. XCM CNC is certified to ISO 9001, ISO 13485, IATF 16949, and GJB9001C, with MOQ from 1 piece.
Key Capabilities
Machining Parameters and Tolerances
- Materials: 6061-T6/T651, 7075-T6/T651, 5052-H32, 6063-T5, with temper and stress condition confirmed by drawing
- Tolerance: +/-0.003 mm (+/-0.00012 inch), IT5 or IT6 accuracy, +/-0.01 mm shaft and bore fits, with h6 and H7 available
- Surface Finish: Ra 3.2 um milled, Ra 1.6 um precision milled, Ra 0.8 um turned or bored, Ra 0.4 um ground, Ra 0.2 um polished
- GD&T: Flatness 0.02 mm, parallelism 0.03 mm/1030 mm, perpendicularity 0.02 mm/1000 mm, position 0.015 mm, concentricity 0.012 mm, roundness 0.006 mm, cylindricity 0.011 mm, profile 0.02 mm
- Max Size: Milling 3000 x 1600 x 1400 mm, turning diameter 1200 x 2500 mm, five-axis 800 x 600 x 900 mm
- Surface Treatment: Clear anodizing 8-15 um, hard anodizing 25-60 um, bead blasting 80#-220#, brushing, powder coating, with masking and allowance control available
- Thread: Internal M1.4-M220, external M2.0-M220, depth 4xD, NPT/BSP/G/PT, with go and no-go gauge inspection
- Inspection Equipment: Hexagon CMM, Leader NCA8106, WanHao VMS-3020G 2.5D vision system, TRIMOS 600L height gauge, roughness tester, and profile projector
Precision Tolerance Limits for Aluminum Features
Selected small precision features can be controlled to +/-0.003 mm, typically on features below 100 mm after review. Shaft diameters can follow h6 (+/-0.005 mm), mating bores can follow H7 (+/-0.006 mm), and fit surfaces at +/-0.003 mm need roughness and flatness to be reviewed together. Roundness of 0.006 mm can apply to bearing seats, while cylindricity of 0.011 mm/1030 mm suits guide parts and hydraulic bores.
Full GD&T Control for Precision Aluminum Parts
Geometric control can cover a full GD&T review for precision aluminum parts. Typical values include flatness 0.02 mm on areas up to 1030 x 1030 mm, parallelism 0.03 mm/1030 mm, perpendicularity 0.02 mm/1000 mm, position 0.015 mm, concentricity 0.012 mm, and profile 0.02 mm. Straightness of 0.01 mm/1030 mm can be used on long guide faces, while symmetry of 0.02 mm can apply to keyways and centered structures.
Surface Roughness Grading for Functional Faces
Surface roughness is controlled by function. Standard milled faces can be Ra 3.2 um, precision milled mounting faces can be Ra 1.6 um, turned outer diameters and bored holes can be Ra 0.8 um, ground sealing faces can be Ra 0.4 um, and polished cosmetic faces can be Ra 0.2 um. Roughness can be checked with a tester or comparison blocks, with sampling position and direction confirmed to the drawing.
Inspection Equipment and Measurement Planning
Precision aluminum parts can be inspected on a Hexagon CMM for position, flatness, and profile; a WanHao VMS-3020G 2.5D system for small part contours and hole locations; and a TRIMOS 600L height gauge for step faces and parallelism. Roughness testing confirms Ra values, and CMM or FAI report formats can be matched to the order requirement.
Specifications
| Product Name | High-Precision Aluminum 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, boring, reaming, multi-side machining |
| Material | Aluminum |
| Material Grade | 6061-T651, 7075-T651 with stress state and temper confirmed by drawing |
| Precision Tolerance | +/-0.003 mm for selected small precision features after review |
| Surface Roughness | Ra 1.6 um milled surfaces, Ra 0.8 um bores or sealing faces, Ra 0.4 um ground surfaces by requirement |
| Surface Treatment | Hard anodizing, clear anodizing, precision milled finish, masked or allowance-controlled surfaces |
| Inspection | CMM, 3D scan, profile inspection, height gauge, roughness tester by order requirement |
| Application | Heat sink contact plates, precision optical brackets, automation locating fixtures, sensor seats |
| Key Features | Flatness control, hole position control, H7/H8 locating bores, thin walls, anodizing allowance |
| Critical QC Requirements | CMM datum setup, roughness verification, coating allowance review, post-anodizing dimension recheck |
| MOQ | 1 Piece |
| Typical Lead Time | 10-15 business days after drawing review |
| Drawing Formats | STEP, IGS, DWG, PDF, X_T |
| Critical Tolerance Control | Flatness 0.02 mm and hole position 0.01 mm require size, datum, and fixturing review |
Applications
High-Flatness Heat Spreader Plates for Electronics
Typical Parts: Heat spreader plate, server heat sink base
Heat transfer efficiency depends directly on contact face flatness and roughness. Excess flatness deviation increases thermal resistance, so machining needs to control clamping stress and cutting heat on the plate surface. A common route is rough milling, stress release, and then finish milling. Requirements such as flatness 0.02 mm, Ra 1.6 um, and post-anodizing reinspection should be confirmed against part size and drawing requirements.
Precision Optical Instrument Brackets
Typical Parts: Optical lens bracket, optical mounting block
Aluminum optical brackets help reduce system weight while maintaining coaxiality, perpendicularity, and assembly positioning through stable datum faces. Key control points include datum transfer, stress release in thin walls, and protection of fit surfaces. Critical dimensions can be checked by CMM to the drawing requirement.
Automation Locating Fixtures and Sensor Mounts
Typical Parts: Positioning fixture base, sensor mount
Locating fixtures and sensor mounts demand tight hole position control because repeat assembly accuracy affects equipment setup efficiency. Hole position of 0.01 mm or H7 and H8 fit bores require clearly defined datums and inspection planning, and hole location can be verified one by one on the CMM after reaming.
Geometric Control for Precision Aluminum Cavities
Typical Parts: Precision aluminum cavity, instrument shielding shell
Precision aluminum cavities need inner dimensions, wall thickness uniformity, and opening flatness to be controlled together, and machining sequence directly affects the final geometry. After finish milling the cavity, wall thickness distribution can be measured to check whether fixturing caused one side to run thin. Critical sections can be compared on the CMM between inner and outer profiles to verify wall thickness consistency against the drawing.
Why Choose Us
Certified Quality Systems and Imported Equipment
XCM CNC is certified to ISO 9001, ISO 13485, IATF 16949, and GJB9001C, covering quality management requirements for medical, automotive, and military projects. Production uses DMG, Mazak, Matsuura, Brother, and other machining centers, supported by Hexagon CMM and 2.5D vision inspection equipment.
Machining Range from Micro Connectors to Large Structures
XCM CNC covers parts from miniature connectors and sensor housings to large structural components. Three-axis milling travel reaches 3000 x 1600 x 1400 mm, and turning capacity reaches diameter 1250 mm. That range supports parts from small precision connectors to mechanical assemblies longer than 2 meters.
Datum Alignment Before Machining Starts
Before machining high-precision aluminum parts, we confirm whether the design datum, machining datum, and inspection datum are aligned. If the drawing datum cannot be established directly in real fixturing, we raise an alternative proposal during quotation and confirm it with the customer before machining to avoid inspection results that do not match the design intent.
Inspection Reports Configured to the Order
CMM reports, vision inspection data, and roughness records can be configured according to order requirements. The report can state datum setup, measurement temperature, and probe information so the customer can align reinspection conditions. Report format and coverage are confirmed at the order stage rather than assumed for every non-critical size.
Transport Protection for Precision Parts
High-flatness heat spreader plates, precision brackets, and aluminum cavities need protection for datum faces and fit faces during shipping. Thin plate parts are packed flat with rigid support to reduce warping under their own weight, while cavities are filled and fixed to prevent internal wall damage during vibration.
Consistency from First Article to Batch Production
After the first article passes full CMM inspection, batch production can follow defined sampling frequency and SPC monitoring for critical dimensions. If dimensional drift appears during the batch, tool wear or fixture loosening can be traced and corrected before production continues. Consistency for precision aluminum parts depends on process control as much as on final inspection.
Dimensional Closure Before and After Surface Treatment
For precision aluminum parts that need anodizing, bare part dimensions are checked and recorded before treatment, then critical fit features are remeasured after anodizing. Comparing those two data sets confirms whether coating thickness stayed within the reserved allowance, and any out-of-tolerance result can be reported before shipment for disposition.
FAQ
What tolerance can you hold for high-precision aluminum CNC parts?
Selected small precision features can be controlled to +/-0.003 mm after review, while regular dimensions follow the drawing requirement. The achievable tolerance depends on part size, wall thickness, fixturing method, post-treatment, and inspection method, so the tightest figure should not be treated as the default for an entire part.
How do you define datum points before inspecting precision aluminum parts?
We confirm design datums, machining datums, and inspection datums from the drawing, and when needed we discuss the CMM measurement plan before ordering. For multi-face hole patterns, heat transfer faces, and fit bores, the datum definition directly affects both report values and acceptance decisions.
Can you inspect aluminum parts with CMM reports?
Yes. Critical aluminum features can be inspected by CMM, vision system, or height gauge according to the order requirement. CMM reports can include datum setup and measurement conditions so the customer can compare reinspection results. Report format and measurement points should be confirmed together with the drawing.
How do you calculate anodizing allowance for precision aluminum bores?
Hard anodizing grows inward and outward by about 50 percent of the coating thickness, so a 50 um coating can reduce bore size by about 50 um. During machining, the target size offset is reserved against the expected coating thickness, then the bore is rechecked after anodizing. Masking or allowance strategy is confirmed from the drawing tolerance and fit requirement.
What is the minimum wall thickness for precision aluminum parts?
Metal thin walls can be reviewed from 0.5 mm as a starting point, and fins can be reviewed around 0.8 mm thickness with 1.0 mm spacing. Actual feasibility depends on wall height ratio, material condition, and fixturing method, and deformation after unclamping still needs to be measured on the real part.
How do you verify flatness on aluminum heat sink contact surfaces?
Flatness can be checked by flatness measuring equipment or by CMM scanning, then judged from the maximum deviation after multi-point fitting. For large heat spreader plates, the measurement setup has to account for part support and self-weight deformation. Flatness 0.02 mm is only meaningful when the measurement area, support points, and ambient temperature are defined together.
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.
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