The single-pass heavy cut suddenly relieves residual stresses causing bending of thin walls that cannot be rectified. The procedure of removing materials in symmetrical and alternate layers followed by the stress-relief annealing cycle is employed by LS Manufacturing. A custom aluminum CNC machining technique utilizing this procedure does not distort and does not elongate the cycle time excessively.
Engineers who use layering of roughing with stress relief relieve 14.2 percent of scrapped metal pieces to 1.8 percent. Thermal-stable CNC machining helps in dimensional uniformity in the whole production run.
High-Speed Low-Depth Finishing
Finishing cuts at Vc=450 m/min and low depths-of-cut reduce the cutting forces in thin walls of 0.8 mm thickness. High spindle speed eliminates heat buildup in the thin part before it gets transferred into the thin wall. Lightweight structural CNC parts utilizing this parameter combination are capable of maintaining flatness and parallelism up to ±0.008 mm in the entire area.
Approval of light finish passes on thin-wall components results in designs that bypass the 14.2% failure rate of traditional practices.
Dynamic Flexible Fixturing
Conventional clamping systems cause stress concentration at contact points, resulting in deformation of thin walls during machining. LS Manufacturing adopts dynamic flexible fixturing systems that hold the workpiece along its entire shape. The precision aluminum parts manufacturer with low-deflection CNC machining capabilities achieves smooth finishes and uniform wall thickness throughout the manufacturing process.
The procurement team receives parts that have been approved by the CMM without going through any cycles of rejections and delays due to rework.
Data Source: ASME Y14.5 geometric dimensioning and tolerancing standard and LS internal process test logs.
LS Manufacturing Custom Aluminum CNC Machining Service For Aerospace Lightweight Structural Bracket: High Precision & Anodizing Integration
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Lightweight aircraft structure bracket made from AL 7075-T651 with 0.8 mm wall thickness had 14.2% rejection due to the problem of residual stress distortion. The current supplier could not control ±0.050 mm concentricity and outsourced anodizing process causing delay of 18 days at $184 per part. The5-axis CNC machining was determined to be the solution.
Client Challenge
Stresses within the 0.8 mm thin-wall configuration were released with each machining operation, causing bends outside the ±0.050 mm tolerance range. Out-sourced Type III anodizing required 5 transit days, raising lead time to 18 days. The scrap rate of 14.2% affected the assembly process of the customer, making the cost per unit to increase to $184.
Engineers trying to procure thin-wall 7075 components without stress-relief procedures should expect distortion of an unforeseen magnitude.
LS 制造解决方案
Roughing process leaving 0.5 mm stock thickness, followed by stress relief annealing. The finishing process involved use of a five axis turning and milling machine with speed Vc = 450 m/min under vacuum fixture clamping. Micro-vibrations on the 0.8 mm wall were overcome by reducing the tool overhang by 15% and adjustment of feed rate. In-house Type III anodizing to give a thickness of 50 μm without any other intermediate processes. Vacuum-fixture CNC machining kept the thin wall undistorted through both cutting and coating stages.
Design teams using stress-relief annealing during the process between roughing and finishing address distortion directly and prevent it rather than fixing it later.
结果和价值
Critical mating tolerances were brought down to ±0.008 mm, an improvement of 6x. The defect rate was lowered from 14.2% to 1.8%. Per-piece costs came down from $184 to $131.5, a decrease of 28.5%. Lead times were reduced from 18 days to 11 days, a 38.9% improvement. All pieces were able to pass ISO 286 tolerances verification and ASTM B117 salt spray test for 1,000 hours. Stress-relief CNC machining protocols are now mandatory for all thin-wall 7075 programs.
Purchasing departments get a one-stop-shop providing guaranteed thin-wall parts in 39% less time at 29% lower price with AS9100D traceability.
Data Source: LS Manufacturing Project #AERO-2026-8942 tracking log, sample size 250 pieces.
From 14.2% scrap and 18-day lead time to 1.8% defects and 11-day delivery — on your thin-wall 7075 bracket. Get a CNC machining quote with in-house anodizing and 28.5% cost savings.
FAQs
1. What tolerances can LS Manufacturing achieve for aluminum parts?
LS manufacturing can deliver standard feature tolerances at 0.015 mm and can consistently maintain precision mating holes and slender wall geometries at 0.008 mm throughout every batch of production, documentable with Zeiss CMM full dimensional inspection report for each feature before shipment.
Data Source: Zeiss CMM inspection report
2. How does anodizing thickness impact precision aluminum dimensions?
Type II Anodizing deposits an average thickness of 12 μm; Type III hard coat deposits up to 50 μm on exposed features. LS Manufacturing pre-compensates this coating thickness as part of CNC programming so that the desired dimensions are achieved after hard coat application and no post-coat rework is necessary.
Data Source: MIL-A-8625 standard
3. How fast can I receive an aluminum CNC machining quote?
Once you submit your 3D CAD in STEP or IGES (with materials and counts) the new DFM team at LS Manufacturing will then provide a detailed quotation with manufacturability analysis, tool path strategy, and cycle time estimates in just a few hours to quickly review and evaluate your project.
4. Which aluminum alloy works best for lightweight structures?
7075-T651 possesses an outstanding strength to weight ratio with yield strength of 503 MPa, and is thus suitable for use in highly loaded structures in aerospace industry; 6061-T6 has great machinability and economical characteristics for general purpose lightweight construction.
5. Does LS Manufacturing provide in-house CNC anodizing services?
Yes, LS Manufacturing has an in-house capability to offer a single stop service from 5-axis CNC machining to Type II decorative or Type III hard anodizing process that will prevent tolerance stack-up due to outsourcing finishing process to various vendors.
6. How do you eliminate thin-wall deformation during aluminum milling?
LS Manufacturing avoids thin wall deformation through symmetric layer-by-layer cutting, using high spindle speed with low feed rate (Vc = 450 m/min), and workpieces are held using vacuum fixtures that evenly distribute clamping force around the whole surface of workpiece without creating any stress concentrations.
Data Source: LS Manufacturing internal testing data
7. What is the thinnest wall LS Manufacturing can reliably machine?
LS Manufacturing can accurately machine local wall thicknesses on aluminum structural components as thin as 0.8 mm without experiencing vibration, chatter or distortion, with precision tolerances of 0.008 mm, using optimized toolpath strategies together with a rigid fixturing system.
8. What standards verify the quality of hard-anodized aluminum parts?
All parts listed are subjected to 1,000 hour salt spray test using ASTM B117 measurements and 100% dimensioning of the part verifying proper coating, wear resistance, and total tolerance requirements for high precision and demanding applications.
Data Source: ASTM B117 salt spray test standard
Summary
The ideal blend of precision aluminum CNC machining and subsequent anodization treatment is critical to producing strong yet lightweight structural parts. Through the utilization of state-of-the-art 5-axis machining centers, comprehensive DFM analysis, and ISO 9001/AS9100D quality systems certification, LS Manufacturing has successfully assisted international clients in overcoming obstacles associated with thin-wall distortion and dimensional tolerance problems, resulting in 28.5% savings in total manufacturing costs.
Are you having any problems with tolerance and secondary operations with your lightweight structural part design? Simply click on the “request a quote” button below to upload your 2D/3D CAD files, and the expert engineers at LS Manufacturing will offer a FREE DFM (Design for Manufacturing) analysis along with a quote in just two hours!
The contents of this page are for informational purposes only.LS Manufacturing servicesThere are no representations or warranties, express or implied, as to the accuracy, completeness or validity of the information. It should not be inferred that a third-party supplier or manufacturer will provide performance parameters, geometric tolerances, specific design characteristics, material quality and type or workmanship through the LS Manufacturing network. It's the buyer's responsibility.Require partsquotation Identify specific requirements for these sections.Please contact us for more information.
LS Manufacturing Team
LS Manufacturing is an industry-leading company.专注于定制制造解决方案。 We have over 15 years of experience with over 5,000 customers, and we focus on high precision CNC machining,Sheet metal manufacturing, 3D printing,Injection molding.Metal stamping,and other one-stop manufacturing services. Our factory is equipped with over 100 state-of-the-art 5-axis machining centers, ISO 9001:2015 certified. We provide fast, efficient and high-quality manufacturing solutions to customers in more than 150 countries around the world. Whether it is small volume production or large-scale customization, we can meet your needs with the fastest delivery within 24 hours. choose LS Manufacturing.这意味着选择效率、质量和专业性。 要了解更多信息，请访问我们的网站：www.lsrpf.com
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