High-Precision Magnesium CNC Machined Parts Supplier
Overview
XCM CNC supports precision magnesium machining with critical tolerances down to +/-0.003 mm and roundness to 0.006 mm, with MOQ from 1 piece, standard lead time of 10-15 days, and quality systems aligned with ISO 9001 and IATF 16949.
Using equipment from brands such as DMG and Matsuura together with CMM inspection, we evaluate thin-wall housings, grounding faces, and hole patterns around fixture datums, GD&T verification, and room-temperature reinspection. That helps control dimensional stability on high-CTE magnesium parts before and after flame-safe machining and surface treatment.
Key Capabilities
Machining Parameters
- Materials: AZ31B, AZ91D, project grades by drawing review
- 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 machined, Ra 0.8 um turned or bored
- GD&T: Coaxiality 0.012 mm, runout 0.01 mm, cylindricity 0.011 mm
- Max Size: Milling 3000 x 1600 x 1400 mm, turning diameter 1250 x 2000 mm
- Surface Treatment: Chromate conversion, micro-arc oxidation, e-coat, spray coating by drawing review
- Thread: M1.4-M220, NPT, BSP, G, PT
- Precision Limit: +/-0.003 mm tolerance, 0.006 mm roundness, 0.01 mm hole position on selected features by drawing review
Datum and Flatness Verification for Precision Magnesium Parts
Precision magnesium datums can be verified to 0.02 mm flatness and 0.015 mm position tolerance with CMM inspection before assembly release. Critical datum faces and mounting holes are machined in controlled setups, while 0.02 mm perpendicularity and 0.01 mm straightness are checked against the drawing datum system.
Single-Setup Control for Hole Position and Coaxiality
Magnesium hole patterns machined in a single setup can target 0.01 mm hole position and 0.012 mm coaxiality on thin-wall housings. H7 holes and h6 shaft positions on walls near 0.5 mm can use the same setup to reduce relocation error, while roundness to 0.006 mm and cylindricity to 0.011 mm are controlled by the boring or turning route.
Surface Roughness Grading for Functional Fits
Magnesium functional fits can combine Ra 1.6 um precision milled faces with Ra 0.8 um turned or bored surfaces on the same part. Standard milled faces stay at Ra 3.2 um without extra finishing, while sealing faces and bearing bores are assigned the tighter roughness grades only where the drawing requires them.
Room-Temperature Reinspection After Surface Treatment
After chromate conversion or micro-arc oxidation, magnesium parts can be reinspected to +/-0.003 mm on critical features using the same CMM datum plan. High-CTE parts are checked again after they return to room temperature, and any shift in 0.02 mm flatness or 0.015 mm position tolerance is captured in the report.
Specifications
| Product Name | High-Precision Magnesium CNC Machined Parts Supplier |
|---|---|
| Manufacturer | XCM CNC |
| Factory Location | Shenzhen, Guangdong, China |
| Quality System | ISO 9001, ISO 13485, IATF 16949, GJB9001C |
| Machining Process | CNC machining |
| Material | Magnesium |
| Material Grade | AZ31B, AZ91D, project grades by drawing review |
| Tolerance | +/-0.03 mm standard CNC machining tolerance |
| Precision Tolerance | +/-0.003 mm for selected critical features by drawing review |
| Surface Roughness | Ra 3.2 um milled, Ra 1.6 um precision, Ra 0.8 um turned or bored |
| Surface Treatment | Chromate conversion, micro-arc oxidation, e-coat, spray coating by drawing review |
| Max Part Size | Milling 3000 x 1600 x 1400 mm / Turning diameter 1250 x 2000 mm |
| Inspection | Hexagon CMM, WanHao VMS-3020G 2.5D video measurement, TRIMOS 600L height gauge, roughness tester, thread gauges |
| Application | Robot mounting plates, optical platform parts, EMI shield cavities |
| Typical Application | Thin-wall magnesium precision parts |
| Key Features | Ultra-lightweight structure, room-temperature review, GD&T control, datum-based inspection |
| Critical QC Requirements | Flame-safe machining control, distortion review, room-temperature reinspection, coating review, moisture protection |
| Batch Range | Prototype to precision repeat orders |
| MOQ | 1 Piece |
| Typical Lead Time | 10-15 business days after drawing review |
| Drawing Formats | STEP, IGS, DWG, PDF, X_T |
| Secondary Process | Deburring, chromate conversion, micro-arc oxidation, e-coat, moisture-protection packaging |
| Material Certificate | Material certificate by order requirements |
| Material Feature | Ultra-lightweight structure, damping behavior, EMI shielding, flame-safe machining review |
| Critical Tolerance Control | Flatness 0.02 mm, position tolerance 0.015 mm, hole position 0.01 mm by drawing review |
Applications
Thin-Wall Shield Covers and Portable Housing Mating Faces
Typical Parts: RF module housing, laser heat-sink base, test fixture body
Magnesium is useful for portable housings, shielding covers, and test-equipment bodies when low weight and EMI shielding are both required. Grounding faces on thin-wall housings can be inspected to 0.02 mm flatness, mounting-hole position to 0.015 mm, and mating-surface roughness to Ra 1.6 um.
Optical Focus-Ring Brackets and Filter Holders
Typical Parts: Lens bracket, filter holder, stabilizer structure
Magnesium brackets help reduce inertia in lens and stabilizer systems and improve response to small vibration. Concentric holes can be controlled to 0.012 mm coaxiality and 0.006 mm roundness, while the mounting datums and filter-seat faces can be accepted at Ra 0.8 um where the drawing requires it.
Control Box Mounting Faces and Instrument Support Parts
Typical Parts: End-effector housing, sensor mounting arm, lightweight guard cover
Ultra-lightweight magnesium can reduce the structural load on robot end-effectors, portable devices, and compact instruments while preserving assembly stiffness. H7 insert holes and 0.01 mm positional features can be completed in a single setup, while the CMM reports the flatness and perpendicularity of the key datum faces.
Gimbal Pivot Seats and Quick-Release Datum Parts
Typical Parts: Low-inertia bracket, quick-release frame, gimbal mount
Low inertia and damping behavior make magnesium suitable for dynamic structures in drones and action-camera gimbals. Pivot-hole cylindricity to 0.011 mm and runout to 0.01 mm can be controlled by the turning route, while quick-release datums can be delivered with 0.02 mm flatness and Ra 1.6 um precision-milled faces.
Why Choose Us
Qualified Systems and Equipment Coverage
XCM CNC organizes magnesium projects under ISO 9001, ISO 13485, IATF 16949, and GJB9001C aligned quality systems, while using equipment from brands such as DMG, Mazak, Matsuura, and Brother to cover housings, brackets, and lightweight structural components. For AZ31B and AZ91D programs, we review flame-safe machining, thin-wall fixturing, and surface protection requirements during the drawing review stage.
Broad Size Range for Lightweight Magnesium Parts
We support magnesium machining from small connector-scale parts to larger structural components, including thin-wall housings, brackets, shielding covers, larger control boxes, and lightweight plates. Three-axis travel reaches 3000 x 1600 x 1400 mm and turning capacity reaches diameter 1250 x 2000 mm, while the final process plan still follows fixturing, flame-safe machining, and surface-protection needs.
Tiered Equipment Strategy for Cost and Quality
XCM CNC uses domestic, Taiwan, Japanese, and Europe or US sourced equipment so standard faces do not occupy imported-machine hours. For magnesium parts, domestic or Taiwan machines can cover regular surfaces, while critical fits and key holes move to DMG and Mazak class machines when +/-0.003 mm features or 0.006 mm roundness are required.
Precision Inspection Coverage and GD&T Verification
XCM CNC uses CMM inspection, WanHao 2.5D video measurement, and TRIMOS height-gauge checks to cover flatness, position, coaxiality, roundness, and related geometric tolerances. Critical magnesium features are reported directly against the drawing GD&T callouts, with tight-tolerance and standard-tolerance dimensions separated for easier customer review.
Room-Temperature and Stage-by-Stage Reinspection
High-CTE magnesium parts are measured again after they return to room temperature instead of relying only on machine-side readings. When surface protection is applied near critical features, we add a staged reinspection sequence and record any dimensional shift before the final acceptance release.
FAQ
What safety measures are used when machining magnesium parts?
Magnesium parts are planned around flame-safe machining, chip control, and the required surface-protection route instead of using the same process rhythm as standard aluminum jobs. The exact method, such as dry cutting or minimum-quantity lubrication, is selected from the grade, geometry, and project environment during review.
What GD&T features can you verify on magnesium precision parts?
CMM inspection can verify flatness to 0.02 mm, position tolerance to 0.015 mm, coaxiality to 0.012 mm, roundness to 0.006 mm, and runout to 0.01 mm. The exact inspection list follows the drawing GD&T callouts, and tight-tolerance dimensions are reported separately from standard dimensions.
What inspection equipment do you use for magnesium tight-tolerance features?
Critical geometric tolerances are checked on the Hexagon CMM, small features and hole positions can be verified on the WanHao VMS-3020G 2.5D video-measurement system, height dimensions can be checked on the TRIMOS 600L height gauge, and surface finish is verified with a roughness tester. Threads are checked with go and no-go gauges.
How do you manage thin-wall distortion when machining magnesium to tight tolerances?
Thin-wall magnesium parts can use staged roughing, low-cutting-force parameters, and a controlled fixture sequence to reduce distortion. Stress-relief preparation can be added before machining when needed, and the key dimensions are checked again after the part returns to room temperature and before or after surface treatment.
Can you control flatness, position, and thin-wall accuracy on magnesium parts?
Typical capability targets include 0.02 mm flatness, 0.015 mm position tolerance, 0.01 mm hole position, and thin walls down to about 0.5 mm. The final feasibility still depends on wall thickness, room-temperature condition, and the inspection plan reviewed against the drawing.
How do you control dimension drift after magnesium parts return to room temperature?
High-CTE magnesium parts include room-temperature reinspection in the process plan rather than relying only on in-machine measurements. Thin-wall housings, grounding faces, and fit-critical holes are rechecked on the CMM after stabilization, and critical areas are checked again after surface protection when required.
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
