Case Study: CNC Machining Cost Reduction Project

In manufacturing, cost reduction is not just about saving money—it directly determines profit margins and competitiveness. For OEM buyers, even a small reduction in unit cost can translate into significant annual savings and a more agile response to market shifts. However, the true challenge lies in reducing costs without sacrificing the structural integrity or precision that high-end industrial systems demand.

As a specialized CNC machining partner focused on cost optimization, Lebometal helps OEMs reduce manufacturing costs through engineering-driven solutions. We believe that the most effective way to lower prices is not through cutting corners, but through “Efficiency by Design.” This case study explores how our team assisted an industrial automation client in reclaiming their margins by identifying hidden waste and re-engineering a high-cost component for volume production.

2. Customer Background

The Client: Nexus Assembly Systems (NAS), a Tier-1 OEM specializing in high-speed modular robotic cells for the electronics and medical device assembly sectors.

The Application: A critical “Actuator Mounting Base.” This part interfaces a high-speed servo motor with a robotic frame, requiring extreme rigidity and precise alignment for belt-drive longevity.

The Project: NAS was facing intense pressure from competitors to lower their total system price. The mounting base was identified as a high-cost outlier in their Bill of Materials (BOM).

• Original Unit Cost: $45.50

• Annual Volume: 12,000 units

• Material: 6061-T6 Aluminum

3. Challenges Faced: The Hidden Costs of Complexity

Initial cost analysis revealed several non-functional features that significantly increased machining time and material waste. NAS was essentially paying for “over-engineering” that didn’t improve performance.

3.1 High Production Cost and Setup Time

The previous supplier was using a three-setup process on a standard 3-axis machine. This meant an operator had to manually move the part three times, increasing labor costs and the risk of setup-related dimensional drift.

3.2 Excessive Material Waste

The part’s original geometry required a large raw material block relative to the finished part size. With a material utilization rate of only 35%, most of the expensive aluminum was being turned into scrap chips.

3.3 Long Cycle Times

Several deep, narrow pockets required small, fragile cutting tools. To avoid tool breakage, the previous shop had to run at extremely slow feed rates, resulting in an 18-minute cycle time—far too slow for a 12,000-unit annual contract.

3.4 High Defect and Rework Rates

The complexity of the manual setups led to a 4% rejection rate. In a high-volume project, this rework and scrap added thousands of dollars to the total project cost every quarter.

4. Our Engineering Solution: Designing for Efficiency

Lebometal’s engineering team performed a top-to-bottom audit to reduce machining cost for the OEM by optimizing the design and the process simultaneously.

4.1 Design for Manufacturability (DFM) Optimization

We proposed several geometric changes to simplify production. This ensured cost reduction through design optimization rather than compromising quality.

• Radius Rationalization: We increased internal pocket radii from 1.5 mm to 4 mm. This allowed us to use larger, more rigid roughing tools that could remove material five times faster than the previous tools.

• Blind to Through-Hole Conversion: We converted blind-tapped holes into through-holes where possible, allowing for faster chip evacuation and higher tapping speeds.

4.2 Process Optimization: The Move to 4-Axis

To eliminate the high labor cost of multiple setups, we moved production to a 4-axis Horizontal Machining Center (HMC) with a “tombstone” fixture. This allowed us to access five sides of the part in a single clamping, reducing setup error and labor costs by over 60%.

4.3 Material Efficiency and Nesting

By adjusting the orientation of the part within the raw material block, we implemented a nesting strategy. We were able to cut four parts from a single block with minimal spacing, increasing material utilization from 35% to 58%.

4.4 Real-World Example: The “Step-Down” Pocket

One specific feature—a deep, narrow slot—was the primary driver of the long cycle time.

• The Solution: We proposed a “Step-Down” design where the top half of the slot was widened to allow a rigid tool to remove the bulk of the material, leaving only a small portion for the specialized narrow tool.

• The Result: This single change reduced the cycle time for that specific feature by 68%.

5. Results Delivered: A New Benchmark for Efficiency

The project delivered measurable financial and operational improvements that far exceeded the client’s initial expectations.

Transforming Competitive Advantage

For the client, this was not just a cost reduction project—it transformed their pricing strategy and competitiveness. They were able to:

• Improve profit margins across their entire robotic cell product line.

• Offer more competitive pricing to end customers, winning two major contracts that had previously stalled due to budget constraints.

• Strengthen their position in a price-sensitive market, allowing for more aggressive marketing of their high-speed automation solutions.

This established Lebometal as a long-term partner for cost optimization and manufacturing efficiency.

6. Why This Matters for OEM Buyers

In a competitive market, being able to reduce manufacturing costs without losing a micron of precision is a massive strategic advantage.

• Protect Your Margins: Engineering-driven cost reduction allows you to maintain healthy profits even when material prices or labor costs rise.

• Accelerated Time-to-Market: By reducing cycle times and eliminating setups, we help you get your final machines to the customer faster.

• Reduced Total Cost of Ownership (TCO): A part that is optimized for manufacturing is naturally more stable and has fewer defects, saving you money on re-inspection and warranty claims.

7. Conclusion: Turn Your Costs into Profits

In the world of CNC machining cost reduction, the biggest savings are rarely found by searching for cheaper labor. They are found by applying engineering expertise to the design itself. This case study demonstrates that by combining DFM principles with advanced 4-axis machining, Lebometal can deliver significant savings while simultaneously improving part consistency.

Discover Your Manufacturing Savings Today

Are you facing high production costs, long cycle times, or excessive material waste in your CNC projects? Don’t settle for “standard” pricing when an optimized solution is possible.

Send us your drawings or technical requirements today. Our engineering team at Lebometal will help you:

• ✔ Reduce machining cost without compromising quality through DFM.

• ✔ Optimize design for better manufacturability and tool accessibility.

• ✔ Improve production efficiency and reduce cycle time with advanced toolpaths.

• ✔ Increase your profit margin through engineering solutions tailored to your project.

Get a fast quotation within 24 hours and discover how much you can save. Let us help you turn your precision components into a more profitable reality.

📩 Contact Sherry at Lebometal.com today.

Precision is our foundation. Efficiency is our result.