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{"title":"Precision CNC Mechanical Parts for CNC Machining Overall Dimensions According To","imgUrl":"https:\/\/img.chinax.com\/nimg\/e3\/b7\/faaa27862d11890a56f17ded28d8-200x200-1\/precision_cnc_mechanical_parts_for_cnc_machining_overall_dimensions_according_to_customer_27s_drawing.jpg","attrs":{"Brand Name":"SINBO","Applications":"Automation Industry, Electron Industry","Processing":"CNC Machining,CNC Milling,CNC Turning","Surface":"Painting, Anodized, PVDF"}}
7075 aluminum is the material everyone reaches for when they hear "aerospace bracket." And most of the time, they're right — the stuff is strong. T6 temper gives you 572 MPa yield strength, which puts it in the same ballpark as some low-alloy steels at less than half the weight. But here's what the data sheet doesn't tell you: 7075 has almost zero corrosion resistance without a protective coating, and it's one of the more difficult aluminum alloys to weld. For a structural bracket that's going to be anodized, bolted in place, and never see a welding torch? Perfect material.
The bracket geometry is where most designs run into machining trouble. Thin ribs — anything below 1.5mm wall — will chatter and flex under cutting forces, especially on 7075 which is harder than 6061. We use climb milling with a high feed rate and light depth of cut to manage the deflection. On complex brackets with multiple thin walls, we'll rough the entire profile first, then do a spring pass (light finish cut with no material removal) before the final finish pass. That spring pass takes the residual stress out of the thin wall so the finish cut holds the dimension.
Key Features
7075-T6 High Strength: 572 MPa yield strength, 620 MPa ultimate tensile — handles structural loads that 6061 simply can't, at 2.81 g/cm³ density
Thin Wall Machining Capability: Walls down to 0.8mm achievable with spring-pass protocol — no chatter marks, no waviness, just flat clean surfaces
Integrated Machined Features: Mounting holes, lightening pockets, stiffening ribs, and alignment features all from one billet — no welding, no assembly
Datum-Hole Positioning: Pin holes for assembly alignment held to ±0.01mm true position relative to mounting surface, ensuring bolt-up without reaming
Weight Reduction Through Pocketing: Up to 40% weight reduction vs solid bracket through strategic CNC pocketing without sacrificing stiffness
±0.01mm (standard), ±0.005mm (mounting holes, datum features, thin walls)
Surface Treatment
Hard Anodize Type III (standard), Chromate conversion (for paint adhesion), Nickel acetate seal
Certifications
ISO 9001:2015, IATF 16949, RoHS, CE, REACH
Lead Time - Prototype
3-5 days
Lead Time - Production
7-10 days (50-200 pcs), 10-15 days (200-1000 pcs)
MOQ
1 piece (prototype), 50+ (production)
Origin
Dongguan, China
Applications
Aerospace Airframe: Wing ribs, fuselage frames, engine mount brackets, and structural support brackets where strength-to-weight ratio is the primary design driver
Satellite and Spacecraft: Deployment mechanism brackets, solar array hinges, and antenna mount brackets that need to survive vibration testing and thermal cycling in vacuum
Robotics: High-load joint brackets for industrial robots, collaborative robots, and exoskeleton frames where 7075's stiffness-to-weight ratio beats 6061 by 30%+
Racing and Motorsport: Suspension mounting brackets, roll cage fittings, and chassis reinforcement brackets for Formula and GT racing teams
Recreational Equipment: Mountain bike frame linkage brackets, climbing equipment fittings, and high-performance sports equipment where weight matters and strength is non-negotiable
Testing and Fixturing: Structural test fixtures, load frames, and rig brackets that need to be strong and light enough to not influence the test results
Why Choose Sinbo Precision
50+ CNC centers including 5-axis: Complex bracket geometry with features on 5 faces? We don't need to flip the part four times. 5-axis simultaneous machining means fewer setups, tighter tolerances, and better surface finish on angled features
Spring-pass thin wall protocol: Our proprietary rough-spring-finish sequence eliminates chatter on walls down to 0.8mm. Most shops can't reliably go below 2mm on 7075 without surface quality issues
7075 experience from multiple industries: We've done 7075 brackets for unmanned aerial vehicle frames, robot joints, satellite components, and racing suspension — the machining strategy is different for each. We know which approach works for your application
In-house hard anodize: Type III hard anodize adds 25-50μm and significantly improves 7075's poor corrosion resistance. We control the entire process — no outsourcing, no excuses
First article in 3 days: Your prototype bracket ships fast so you can do the structural test and finalize the design before committing to production tooling
Material certification on every order: Mill certificates for every billet, heat lot traceability, and mechanical test reports available on request
Manufacturing Process
Design Review & FEA Support: We review your bracket design for machining feasibility — thin walls, deep pockets, tool access, and datum selection. If you need FEA validation, we can coordinate with your engineering team
Material Procurement: 7075-T6 plate or block per ASTM B209, with mill certification and heat lot traceability. Custom tempers (T73) available on request
CNC Machining (3/4/5-axis): Rough profile, rough pockets, spring pass on thin walls, finish all surfaces, drill and ream mounting holes — setup count depends on geometry complexity
Deburring & Edge Break: All sharp edges broken to 0.2mm radius minimum (0.5mm for aerospace applications). Thin walls deburred by hand to avoid distortion
Hard Anodize (Type III): Rack-plated in-house, 25-50μm coating thickness, sealed in nickel acetate. Color options: black, natural, olive drab
Final Inspection & Packaging: CMM inspection on all critical dimensions, first-article report with full GD&T evaluation, individually wrapped and boxed
Frequently Asked Questions
Q: 7075 or 6061 for my structural bracket — which should I actually use?
A: It depends on the loading. If your bracket sees predominantly tensile and compressive loads with a decent safety factor (>2x), 6061 is probably fine and it's cheaper and easier to machine. If you're pushing the design limits — thin walls, high loads, fatigue cycling — 7075 is worth the cost premium. Don't specify 7075 just because it sounds cooler. Do the math first.
Q: Can you hold ±0.005mm on a 200mm bracket?
A: On specific features — datum holes, critical bores, mounting faces — yes. On the overall length of a 200mm bracket? That's pushing it for 7075, which moves about 23 microns per 10°C temperature change. We machine in a temperature-controlled environment and measure at 20°C, but if your assembly facility is at 25°C, that bracket is going to be 11 microns longer. Design your tolerances around thermal reality, not just what's on paper.
Q: Why can't 7075 be welded?
A: It can be welded, but poorly. The T6 heat treatment is what gives 7075 its strength, and welding destroys that in the heat-affected zone. You end up with a joint that's 40-50% of the parent material strength. For a structural bracket, that defeats the purpose. Bolted or riveted joints are the standard approach for 7075 assemblies.
Q: What's the minimum fillet radius you can cut on internal corners?
A: With a standard 6mm ball end mill, 3mm fillet radius. With a 3mm ball, 1.5mm. Below that we're looking at chamfering the corner with a smaller tool and then doing a manual blend. Internal sharp corners are a stress concentrator anyway — your engineer probably wants a fillet there.
Q: Do you offer stress corrosion cracking resistant temper (T73)?
A: Yes — 7075-T73 is available on request. It trades about 10% of the T6 strength for dramatically improved resistance to stress corrosion cracking in humid and salt-laden environments. The tradeoff is worth it for brackets that live outside or in marine service. Lead time adds 2-3 days for the temper verification.
