Every CNC project has a target budget, and there are proven ways to reduce machining cost without sacrificing quality. Here are 7 practical tips we share with clients during DFM (Design for Manufacturing) review.
## 1. Relax Tolerances on Non-Critical Surfaces
The single biggest cost driver is over-tolerance. If a dimension doesn’t affect assembly or function, loosen it from ±0.01 mm to ±0.05 mm. This can cut machining time by 20-30%.
## 2. Design for Standard Tooling
Deep narrow slots (<3mm wide), tiny internal corners (
## 3. Choose the Right Material
Premium materials like 7075 aluminum, titanium, and PEEK cost 2-5x more than standard options. Only use high-performance alloys where the application demands it.
## 4. Optimize Part Geometry
Sharp internal corners require EDM or small end mills. Generous corner radii (R1 or larger) allow faster machining with standard tools.
## 5. Increase Batch Size
Setup time is a fixed cost per batch. A 10-piece run and a 100-piece run have the same setup cost, making per-unit cost much lower at higher volumes.
## 6. Avoid Secondary Operations
Anodizing, plating, and painting add lead time and cost. If a clear or bead-blasted finish is acceptable, skip coating and save both time and money.
## 7. Prototype First, Then Production
Test your design with a 5-10 piece prototype run before committing to full production. Catching design issues early avoids expensive rework at scale.
At Legend Precision, our engineers review every drawing before quoting and suggest these cost-saving optimizations. Get a free DFM review with your next quote.