Aluminum CNC Machining: A Practical Guide to Tolerance Control
Based on experience with 72 CNC machines, we analyze root causes of aluminum tolerance issues. Covers material selection and DFA for precise control.
Steady 3-axis milling — efficiency and precision together, faster batch delivery
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Steady 3-axis milling — efficiency and precision together, faster batch delivery
ShowyMetal operates more than 40 CNC machining centers, delivering professional and efficient 3-axis CNC machining services. 3-axis CNC machining is the most versatile and cost-effective CNC machining method, ideal for precision machining of planar, slotted, and hole-system features. Whether for prototyping or volume production, we deliver consistent and reliable machining quality.
Planar parts: base plates, panels, covers, heat sinks
Slotted parts: guide rails, sliders, fixture bases
Hole-system parts: mounting plates, connection plates, flanges
Simple-profile parts: brackets, supports, housings (without side holes or side slots)
| Parameter | Specification |
|---|---|
| Max machining size | 1200mm x 600mm x 400mm |
| Min machining size | 5mm x 5mm x 2mm |
| Standard tolerance | ±0.05mm (ISO 2768-m) |
| Precision tolerance | ±0.01mm (per engineering drawing) |
| Surface roughness | Ra 1.6μm (standard) / Ra 0.8μm (fine finish) / Ra 0.4μm (ultra-fine finish) |
| Min wall thickness | 0.5mm (aluminum) / 1.0mm (steel) |
| Spindle speed | up to 12,000 RPM |
| Tool magazine capacity | 24 tools |
| Standard lead time | 3-7 working days |
| Minimum order quantity | 1 piece |
ShowyMetal processes a wide range of materials on 3-axis mills, including aluminum alloys (6061, 7075, 2024), stainless steel (303, 304, 316, 17-4 PH), carbon steel, tool steel, brass, copper, titanium alloys, and engineering plastics such as POM, PEEK, nylon, ABS and polycarbonate. Optimal cutting tools and parameters are selected for each material to ensure surface quality and dimensional accuracy.
Anodizing (Type II / Type III) for aluminum parts
Electroplating: zinc, nickel, chrome plating
Powder coating and wet painting
Sandblasting / bead blasting for a uniform matte finish
Polishing and brushing for decorative surfaces
Passivation for stainless steel parts
3-axis CNC machining is widely used across industries. In consumer electronics it produces housings, frames and heat-dissipation components. In industrial automation it machines fixture bases, guide rails and mounting plates. In the automotive sector it supports prototyping of brackets, sensor housings and structural components. The flexibility and cost efficiency of 3-axis machining make it the preferred choice for most general-purpose precision parts.
40+ CNC machining centers with 24/7 production capacity
Tolerance down to ±0.01mm with ISO 2768-m compliance
Fast turnaround: 3-7 working days, 1-piece minimum order
Free DFM analysis and engineering support before production
Full material traceability and ISO 9001 quality system
One-stop service from machining to surface treatment and assembly
A selection of parts produced with this machining process.
Custom Precision Components for Aerospace
Aluminum Structural Parts for Aerospace
CNC Machined Housings for Aerospace
We deliver custom online CNC machining services from rapid machining to high-volume production, manufactured in and shipped worldwide from our 3 self-owned factories in Dongguan. With 70+ CNC machines covering milling, turning, swiss, EDM and drilling. As a self-owned factory there is no middleman markup, so lead time and quality are better guaranteed.
Professional 3-axis CNC machining for aluminum, stainless steel and titanium, with tolerances down to ±0.01 mm for precision parts.
Learn MoreProfessional 4-axis CNC machining that machines multiple faces in a single setup, cutting setup error and boosting efficiency and accuracy.
Learn MoreProfessional 5-axis CNC machining for complex curved surfaces in one pass — ideal for aerospace and medical parts.
Learn MoreProfessional CNC turning for rotational parts, supporting inner and outer diameters, threads and grooving.
Learn MoreProfessional Swiss-type machining for slender shafts and micro precision parts, ideal for medical catheters and electronic connectors.
Learn MoreProfessional mill-turn machining that completes turning, milling and drilling in a single setup for highly complex parts.
Learn MoreProfessional injection molding services for ABS, PC, POM, PA and other engineering plastics, from rapid tooling to mass production.
Learn MoreProfessional sheet metal fabrication services — laser cutting, CNC bending, welding and finishing for enclosures, brackets and chassis
Learn MoreFull material coverage: browse our complete CNC machining material library.
Light, strong and finish-friendly — the first choice for appearance parts
| Color | silver |
|---|---|
| Subtypes | 6061, 6061-T6, 2024, 5052, 5083, 6063, 6082, 7075, 7075-T6, ADC12 (A380) |
| Available Finish | As machined, Anodizing, Powder coating, Electroplating, Painting, Sand blasting, Polishing |
| Price | $ |
| Lead Time | 15-25 days (batch) |
Corrosion-resistant and high-strength — reliable in harsh conditions
| Color | silver |
|---|---|
| Subtypes | 304, 316, 316L, 303, 17-4PH, 2205 |
| Available Finish | As machined, Passivation, Electropolishing, Bead blasting, Powder coating |
| Price | $$ |
| Lead Time | 15-25 days (batch) |
The lightest yet the strongest — cut weight without losing performance
| Color | gray |
|---|---|
| Subtypes | Grade 2, Grade 5 (Ti-6Al-4V), Grade 1 |
| Available Finish | As machined, Anodizing, Polishing, Bead blasting |
| Price | $$$ |
| Lead Time | 15-25 days (batch) |
The reliable choice balancing strength and cost
| Color | gray |
|---|---|
| Subtypes | 1018, 1020, 1045, A36, A572, Q235, Q345 |
| Available Finish | As machined, Black oxide, Powder coating, Zinc plating, Painting, Sand blasting |
| Price | $ |
| Lead Time | 15-25 days (batch) |
Excellent electrical and thermal conductivity — ideal for precision parts
| Color | copper |
|---|---|
| Subtypes | C110 (Copper), C360 (Brass), C260 (Cartridge brass), C464 (Naval brass), C932 (Bearing bronze) |
| Available Finish | As machined, Polishing, Patina, Lacquering, Powder coating |
| Price | $$ |
| Lead Time | 15-25 days (batch) |
Impact-resistant general engineering plastic with great value
| Color | white |
|---|---|
| Subtypes | Natural, Black, Flame Retardant (FR) |
| Available Finish | As machined, Painting, Silk screening, Pad printing |
| Price | $ |
| Lead Time | 15-25 days (batch) |
High-impact transparent engineering plastic — tough and crystal-clear
| Color | clear |
|---|---|
| Subtypes | General purpose, Optical grade |
| Available Finish | As machined, Polishing, Painting |
| Price | $$ |
| Lead Time | 15-25 days (batch) |
Dimensionally stable and low-friction — the pick for gears and bearings
| Color | white |
|---|---|
| Subtypes | POM-H (Homopolymer), POM-C (Copolymer) |
| Available Finish | As machined |
| Price | $$ |
| Lead Time | 15-25 days (batch) |
High-temperature specialty engineering plastic for extreme duty
| Color | tan |
|---|---|
| Subtypes | Virgin PEEK, Glass-filled, Carbon-filled |
| Available Finish | As machined |
| Price | $$$ |
| Lead Time | 15-25 days (batch) |
Tough and wear-resistant — ready for friction and impact
| Color | natural |
|---|---|
| Subtypes | PA6, PA66, PA12, Glass-filled Nylon |
| Available Finish | As machined |
| Price | $$ |
| Lead Time | 15-25 days (batch) |
Mirror-grade transparency — a crystal-clear visual choice
| Color | Clear |
|---|---|
| Subtypes | Cast, Extruded, UV resistant, Colored, Frosted, Mirror polished |
| Available Finish | As machined, Diamond mirror cutting, Flame polishing, Bead blasting, Silk screening |
| Price | $$ |
| Lead Time | 15-25 days (batch) |
Corrosion-proof and low-friction — the guardian of extreme environments
| Color | White |
|---|---|
| Subtypes | Virgin, Glass filled, Carbon filled, Bronze filled, Graphite filled, Modified |
| Available Finish | As machined, Annealing, Mirror turning |
| Price | $$$ |
| Lead Time | 15-25 days (batch) |
High-strength, heat-resistant and inherently flame-retardant
| Color | Amber |
|---|---|
| Subtypes | Ultem 1000, Glass filled, Carbon filled, Medical grade, Food grade, Wear grade |
| Available Finish | As machined, Stress-relief annealing, Polishing |
| Price | $$$$ |
| Lead Time | 15-25 days (batch) |
Heat- and chemical-resistant — steady in harsh environments
| Color | Beige / Black |
|---|---|
| Subtypes | Virgin, Glass filled GF40, Carbon filled, Wear resistant, Conductive, Food grade |
| Available Finish | As machined, Annealing |
| Price | $$$ |
| Lead Time | 15-25 days (batch) |
Light and chemical-resistant — the value performer
| Color | Natural / White / Black |
|---|---|
| Subtypes | Homopolymer, Copolymer, Glass filled, Flame retardant, Food grade, UV resistant |
| Available Finish | As machined |
| Price | $ |
| Lead Time | 15-25 days (batch) |
Wear-resistant and self-lubricating — composed even in the cold
| Color | Natural / White / Black |
|---|---|
| Subtypes | HDPE, UHMW-PE, LDPE, Food grade, UV resistant, Conductive |
| Available Finish | As machined |
| Price | $ |
| Lead Time | 15-25 days (batch) |
Inherently flame-retardant and corrosion-resistant — economical and durable
| Color | Dark grey / White / Clear |
|---|---|
| Subtypes | Rigid PVC (UPVC), CPVC, Clear PVC, Flame retardant, Food grade, UV resistant |
| Available Finish | As machined, Polishing, Welding |
| Price | $ |
| Lead Time | 15-25 days (batch) |
Hydrolysis-resistant and repeatably sterilizable — trusted for medical and baby products
| Color | Amber transparent |
|---|---|
| Subtypes | PSU, PPSU, Glass filled PSU, Medical grade, Food grade, Wear grade |
| Available Finish | As machined, Stress-relief annealing, Polishing |
| Price | $$$ |
| Lead Time | 15-25 days (batch) |
Explore our full range of post-processing and surface finishing services.
Aluminum Type II anodizing in 50+ colors, decorative and corrosion resistant.
| Color | Clear, Black, Gold, Red, Blue |
|---|---|
| Applicable Materials | Aluminum, Titanium |
| Thickness | 5-25 μm |
| Price | $$ |
| Lead Time | About 3 business days |
Aluminum Type III anodizing, thick wear-resistant insulating layer.
| Color | Gray, Black |
|---|---|
| Applicable Materials | Aluminum |
| Thickness | 25-150 μm (Type III) |
| Price | $$$ |
| Lead Time | About 5 business days |
Surface Treatment
Aluminum chromate conversion coating, corrosion resistant and conductive.
| Color | Gold, Clear |
|---|---|
| Applicable Materials | Aluminum |
| Thickness | 0.5-3 μm |
| Price | $ |
| Lead Time | About 2 business days |
Electroless nickel, uniform deposit, corrosion and wear resistant.
| Color | Silver |
|---|---|
| Applicable Materials | Steel, Copper, Aluminum |
| Thickness | 5-25 μm |
| Price | $$ |
| Lead Time | About 4 business days |
Zinc plating for steel, clear/yellow/black passivation, cost effective.
| Color | Silver, Yellow, Black |
|---|---|
| Applicable Materials | Steel, Iron |
| Thickness | 5-25 μm |
| Price | $ |
| Lead Time | About 3 business days |
Chrome plating, decorative and hard, boosts hardness and appearance.
| Color | Silver (bright) |
|---|---|
| Applicable Materials | Steel, Brass, Copper |
| Thickness | 0.25-1 μm |
| Price | $$$ |
| Lead Time | About 5 business days |
Stainless steel passivation removes free iron, ASTM A967 compliant.
| Color | — |
|---|---|
| Applicable Materials | Stainless Steel |
| Thickness | — |
| Price | $ |
| Lead Time | About 2 business days |
Powder coating, durable UV and chemical resistant, rich colors.
| Color | Various (RAL/Pantone) |
|---|---|
| Applicable Materials | All metals |
| Thickness | 60-120 μm |
| Price | $$ |
| Lead Time | About 4 business days |
Surface Treatment
Wet painting with custom colors, epoxy/polyurethane/enamel systems.
| Color | Various (RAL/Pantone) |
|---|---|
| Applicable Materials | All metals and plastics |
| Thickness | 20-35 μm |
| Price | $$ |
| Lead Time | About 4 business days |
Surface Treatment
Bead blasting for uniform matte finish, removes marks and burrs.
| Color | Matte Silver |
|---|---|
| Applicable Materials | All metals |
| Thickness | — |
| Price | $ |
| Lead Time | About 2 business days |
Polishing to mirror or near-mirror finish, refined and clean.
| Color | Mirror finish |
|---|---|
| Applicable Materials | All metals |
| Thickness | Ra 0.2-0.8 μm |
| Price | $$ |
| Lead Time | About 3 business days |
Surface Treatment
Brushing for consistent straight grain, premium satin look.
| Color | Satin finish |
|---|---|
| Applicable Materials | All metals |
| Thickness | — |
| Price | $ |
| Lead Time | About 2 business days |
Silk screening on plastic/metal, clear durable single or multi-color.
| Color | Single / multi colour (Pantone) |
|---|---|
| Applicable Materials | ABS, PC, PMMA, PET and other plastics |
| Thickness | 5-20 μm |
| Price | $ |
| Lead Time | About 2 business days |
Laser engraving, non-contact permanent marks, precise and traceable.
| Color | Light grey / dark (depends on material) |
|---|---|
| Applicable Materials | ABS, PC, POM, PEEK, Nylon |
| Thickness | 0.05-0.5 mm |
| Price | $$ |
| Lead Time | About 2 business days |
Vacuum metallizing for metallic look, dense and wear resistant.
| Color | Silver, gold, chrome |
|---|---|
| Applicable Materials | ABS, PC, PMMA |
| Thickness | 0.5-2 μm |
| Price | $$$ |
| Lead Time | About 4 business days |
Plastic painting hides base color, matte/gloss, brand-color custom.
| Color | Various colours (matte / gloss) |
|---|---|
| Applicable Materials | ABS, PC, PMMA, PA and other plastics |
| Thickness | 20-40 μm |
| Price | $$ |
| Lead Time | About 3 business days |
Whether you require rapid machining, small-batch machining or high-volume manufacturing, we offer CNC machining solutions that scale with your project, maintaining quality, precision and fast turnaround times.
Explore Our ServicesWe operate 3 self-owned factories in Dongguan, where our in-house CNC capacity enables 1-day lead times. Equipped with standard CNC machines, including grinders, wire cutters and EDM machines, as well as automated production lines. As a self-owned factory there is no middleman markup, so lead time and quality are better guaranteed. We provide precision manufacturing, smooth communication and reliable global logistics for prototype and production orders.
One-stop in-house capacity across CNC machining, sheet metal, injection molding and surface treatment — no middlemen, you keep control of both lead time and quality.
Founded in 2005, focused on demanding metal parts machining, serving 20,000+ customers worldwide.
3-axis, 4-axis and 5-axis machining centers plus mill-turn cells — flexible for any volume.
High-speed centers with in-line gauging hold critical tolerances within ±0.01mm.
Prototypes in as fast as 2-3 days, production in 7-15 days — lead times written into the contract.
Mirror-grade finish and micron-level precision, with 100% inspection before shipment.
Mirror-grade polishing delivers a bright, smooth, high-gloss surface.
Soft fixturing and fully protected handling eliminate clamp marks and scratches.
100% outgoing inspection with CMM verification against your 3D model.
Batch-controlled anodizing and coating keeps color within ΔE consistency.
With strict adherence to industry tolerances, our CNC machining services ensure consistent accuracy for all machined parts, allowing each component to integrate perfectly.
Optimize your parts for cost-effective CNC manufacturing with our design guidelines. Our engineers provide design-for-manufacturability (DFM) feedback before production, helping you move smoothly from prototyping to production.
Your success depends on reliable parts. Our CNC machining services provide precision machining with a 90% first-pass yield, delivering quality machined parts for both prototypes and production runs.
Our ISO 9001 certified CNC machining facilities, together with ISO 14001 and IATF 16949, meet the highest international standards for quality and compliance.
We have more than 30 quality engineers and over 20 advanced inspection tools, including CMMs, 2D measuring systems and XRF analyzers, ensuring accurate dimensions and consistent performance in every project.
Each stage, from raw material to final inspection, follows strict quality control procedures, with full inspection reports and material certificates available.
Related to 3-Axis CNC Machining
Yes. We specialize in mass production with a 100-piece MOQ and can handle batches of 100,000+ units. Volume-based tiered discounts apply.
Although the hourly machine rate is slightly higher, 4-axis machining typically reduces total costs by minimizing the number of setups. For complex multi-sided parts, 4-axis machining is often more cost-effective than multiple 3-axis setups.
In 3-axis CNC machining, the tool moves along straight X, Y, and Z axes. In 4-axis machining, a rotary A-axis is added, allowing the workpiece to rotate. This enables the machining of complex features on multiple sides without re-fixturing.
Standard machined surface roughness is 125 Ra (3.2 µm); finish machining achieves 63 Ra (1.6 µm). Post-processing such as sandblasting or polishing can further improve surface quality.
Choose 5-axis machining for complex 3D surfaces, deep cavities with small radii, undercuts, or when the highest precision is needed on multi-feature parts. 5-axis excels on impellers, turbine blades, sculptured surfaces, and any geometry requiring simultaneous rotary and linear axis movement.
4-axis machining adds rotational capability, allowing features on multiple faces to be machined in a single setup. This reduces clamping time, improves accuracy between faces, and enables the production of cylindrical profiles and continuous spiral geometries.
5-axis simultaneous motion means all five axes move during cutting, enabling complex 3D contour machining. 5-axis positioning (3+2) locks rotary axes at specific angles, then uses standard 3-axis movement. Continuous 5-axis suits complex profiles; positioning 5-axis is better for multi-face prismatic parts.
Yes, our 5-axis equipment is specifically designed for difficult-to-machine materials. We have extensive experience machining Inconel, titanium alloys, Hastelloy, and other superalloys commonly used in the aerospace and energy industries.
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