Overview
XCM CNC supports magnesium machining with ISO 9001 and IATF 16949 aligned systems, MOQ from 1 piece, standard lead time of 10-15 days, and a tiered equipment mix from imported machines down to lower-hour domestic resources.
On magnesium parts, cost control depends on tolerance grading, roughness grading, and selective protection planning. Standard +/-0.03 mm dimensions and Ra 3.2 um milled faces stay inside the base route, while tight-tolerance features and advanced protection steps are reviewed separately from the drawing.
Cheap cnc machining services from a direct factory supplier. 
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
- Cost Note: Standard +/-0.03 mm and Ra 3.2 um are included in the base machining route, while tighter targets are priced separately
Base-Cost Tolerance Coverage for Cost Planning
Magnesium standard dimensions at +/-0.03 mm can stay inside the base machining route without extra setup or inspection cost. Functional holes at 0.015 mm position tolerance are treated as targeted precision operations, while non-critical outer features remain on the standard route so the whole part does not inherit tight-tolerance cost.
Surface Finish Grading to Reduce Machining Hours
Magnesium faces can stay at Ra 3.2 um on regular milled surfaces while Ra 1.6 um or Ra 0.8 um is reserved only for mating faces and turned bores. Non-appearance and non-assembly faces do not automatically receive extra finish passes, which helps remove unnecessary machine time from the quotation.
Standard Equipment Coverage for Regular Features
Regular magnesium features inside +/-0.03 mm and Ra 3.2 um can run on domestic or Taiwan-made equipment with lower hourly cost. Thin-wall precision areas and H7 holes can move to imported machines such as DMG and Mazak, while CMM inspection is focused on the critical dimensions rather than the entire part.
Selective Coating Zones to Control Protection Cost
Selective chromate conversion or micro-arc oxidation can be applied only where functional or grounding faces need it, while protected internal cavities and non-contact zones stay on the standard route. That avoids putting full-part premium coating cost onto features that do not affect function.
Specifications
| Product Name | Cheap 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 | Lightweight electronics housings, portable mounting plates, non-sealed automotive brackets |
| Typical Application | Cost-balanced magnesium machining |
| Key Features | Ultra-lightweight structure, tolerance grading, finish-level planning, coating-level selection |
| Critical QC Requirements | Flame-safe machining control, distortion review, room-temperature reinspection, coating review, moisture protection |
| Batch Range | 1 piece to planned repeat batches |
| 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
Portable Instrument Brackets and Module Mounts
Typical Parts: Collaborative robot arm housing, servo motor end cap, AGV battery carrier
Ultra-lightweight magnesium can reduce the structural load on robot end-effectors, portable devices, and compact instruments while keeping assembly stiffness. Insert holes and location faces can receive H7-level attention, while the remaining mounting faces and connection holes stay on the +/-0.03 mm route to avoid unnecessary precision cost across the full part.
Lightweight Equipment Housings and Control-Box Panels
Typical Parts: 5G base station heat-sink enclosure, LiDAR housing, RF shielding can
Magnesium is attractive for portable housings, shielding covers, and test-equipment enclosures when weight and EMI shielding both matter. Grounding faces and RF-contact zones can receive micro-arc oxidation or chromate conversion where required, while internal cavities and non-exposed faces stay on the standard route to avoid full-part premium coating cost.
Low-Inertia Brackets and Drone Mounts
Typical Parts: Low-inertia bracket, quick-release frame, gimbal mount
Low inertia and damping behavior make magnesium useful for dynamic structures in drones and action cameras. Pivot holes can receive Ra 0.8 um boring only where function requires it, while weight-reduction pockets and outer faces remain at Ra 3.2 um to reduce machine hours that do not improve performance.
Vehicle Interior Lightweight Brackets and Module Seats
Typical Parts: Transmission housing cover, instrument panel bracket, lightweight chassis mounting bracket
For interior lightweight structures, magnesium can reduce inertia and installation weight as long as the service condition avoids aggressive corrosion exposure. Domestic equipment can cover standard mounting points and connection holes, while imported machines and CMM checks are focused only on the faces and holes that directly control assembly.
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 mainland China, Taiwan, Japan, and Europe or US sourced equipment as a tiered manufacturing pool. Regular magnesium faces and non-critical structures can run on lower-hour machines, while imported machines are reserved for +/-0.003 mm precision features and H7 holes. That keeps the premium machine time concentrated only where the drawing requires it.
Functional Surface Grading for Better Cost Control
Grounding faces, fit-critical holes, and defined appearance surfaces keep the required accuracy and roughness, while ordinary structure faces stay on the +/-0.03 mm and Ra 3.2 um route. The result is that labor, inspection, and machine time stay focused on the features that affect assembly instead of the entire part.
Protection Plans Chosen Only Where Needed
Micro-arc oxidation, chromate conversion, e-coat, and spray coating can add very different cost levels to magnesium projects. During DFM, we define which faces actually need the premium route and which internal or non-exposed areas can stay on the standard plan, so protection cost follows real coverage instead of a blanket full-part assumption.
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.
How does tolerance grading affect the price of magnesium CNC parts?
Standard +/-0.03 mm tolerance and Ra 3.2 um milled faces stay inside the base machining quotation, while +/-0.003 mm precision features, H7 holes, and Ra 0.8 um functional bores need extra process and inspection steps. When the drawing clearly separates critical dimensions from standard dimensions, the total part price is usually easier to control.
Is standard +/-0.03 mm tolerance included in your base magnesium machining cost?
Yes. +/-0.03 mm dimensions and Ra 3.2 um standard milled faces are treated as normal CNC output and stay inside the base route. Standard threads, common chamfers, and deburring can also stay inside the normal process, while tight geometric tolerances and special roughness targets are quoted separately from the drawing.
How can I reduce surface treatment cost on magnesium parts?
The most direct approach is to mark which faces truly need micro-arc oxidation or chromate conversion and which faces can remain in the machined state. The cost difference between full-part coating and local coating can be significant, and internal or non-exposed areas often do not need the premium route.
Which features usually add the most cost on magnesium CNC parts?
Thin-wall deep cavities, full-part premium protection, strict appearance surfaces, and complex flame-safe machining controls usually add more cost than standard outer geometry. Separating critical functional areas from ordinary structure is one of the simplest ways to keep the total project cost under control.
How do you lower magnesium part cost without losing lightweight benefits?
We reduce cost by grading functional faces, planning stock allowance carefully, applying protection only where it is needed, and limiting advanced inspection to the real assembly features. That keeps the lightweight and EMI shielding advantages of magnesium while removing extra work from non-critical areas.
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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