Cost-Optimization Checklist: How to Reduce CNC Machining Expenses

Jan 12, 2026
Tags: Professional precision metal parts forging + CNC machining + polishing, etc.Aerospace-grade aluminum 70756061 aluminum alloy304 stainless steel

In custom manufacturing, the difference between a cost-effective project and an over-budget one often lies in the Design for Manufacturing (DFM) phase. At Zhuoguan Metal, we believe you shouldn't have to sacrifice precision for price. Here is our expert checklist to help you optimize your next production run.


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Part 1: The Design Efficiency Audit

1. Avoid Deep, Narrow Cavities

Features with a depth-to-diameter ratio greater than 6:1 require specialized tooling and slower feed rates, which drastically increase machine time.

Cost Impact: High (+20-30%)

Zhuoguan Advice: Limit hole depth to 4x the diameter whenever possible to allow for standard end mills.


2. Standardize Your Internal Radii

Designing sharp internal corners or non-standard radii forces the machine to stop or use expensive EDM (Electrical Discharge Machining) processes.

Cost Impact: Moderate

Zhuoguan Advice: Ensure internal corner radii are at least 110% of the milling tool's radius to allow for high-speed circular interpolation.


3. Simplify Surface Finish Requirements

Does every surface need a mirror polish (Ra < 0.4)? Over-specifying surface roughness on non-critical faces is a primary driver of wasted budget.

Cost Impact: Variable

Zhuoguan Advice: Specify "As-Machined" (Ra 3.2) for non-functional surfaces and only apply high-precision finishes (Ra 0.8) where strictly necessary.


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Part 2: Material and Quantity Strategy

Material selection isn't just about the raw cost per kilogram; it’s about Machinability.

Material GroupMachinability RatingCost Optimization Strategy
Aluminum (6061-T6)ExcellentBest for prototypes and light-weight parts.
Stainless Steel (304)ModerateAvoid tight tolerances on small features to prevent tool breakage.
Titanium (Grade 5)LowUse only for critical aerospace/medical components; design for minimal material removal.




Part 3: The Advantage of Volume Scaling

The "First Part" is always the most expensive due to CAD/CAM programming and machine setup. At Zhuoguan Metal, we offer tiered pricing to help you scale:

  • Prototyping (1-10 units): Focused on speed and design verification.

  • Bridge Production (50-500 units): Optimizing jigs and fixtures to lower per-unit costs.

  • Mass Production (1000+ units): Leveraging automated processes for the most competitive global pricing.


Get a Free DFM Cost Analysis

Ready to see how much you can save on your next project? Zhuoguan Metal provides more than just a quote—we provide a path to better manufacturing.

  • Step 1: Upload your 3D files (STEP, SolidWorks).

  • Step 2: Our engineers perform a "Cost-Drivers" audit.

  • Step 3: Receive a detailed quote with optimization suggestions.

Optimize Your Costs Now: www.zhuoguanmetal.com, E-mail: gavinlee@zhuoguanmetal.com

ZG Metal focuses on the research and development and production of precision parts for various industries. We supply forgings and CNC machined parts using various casting processes.
Copyright © Zhuo Guan Metal Co., Ltd. All Rights Reserved.

Phone&WhatsApp:+86 13410452313

Email:gavinlee@zhuoguanmetal.com

Address: Room 805-1, Building A, Block 1, Xingzhan Plaza, No. 446, Shajing Nanhuan Road, Shatou Community, Shajing Street, Bao'an District, Shenzhen, Guangdong, China 518104