CNC Design Guidelines & Resources
Practical CNC design guidelines to improve manufacturability, part quality, lead time, and machining cost.
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DESIGN RESOURCES
Design Topics
Explore key CNC design considerations for more manufacturable and cost-effective parts.
Wall Thickness
Holes & Threads
Internal Corners & Radii
Undercuts
Tolerances
Surface Finish
DESIGN REFERENCE
Quick CNC Design Reference
General design recommendations to improve CNC machinability, part quality, and production efficiency.
Feature
Recommendation
Design Note
Minimum Wall Thickness
≥ 1.0 mm
Thicker walls improve rigidity.
Internal Corner Radius
≥ 0.5 mm
Larger radii improve tool access.
Hole Diameter
≥ 0.5 mm
Smaller holes require review.
Hole Depth
≤ 4 × Diameter
Deep holes increase tool deflection.
Thread Depth
≤ 1.5 × Diameter
Avoid unnecessary thread depth.
General Machining Tolerance
±0.05 mm typical
Tighter tolerances available for critical features.
Surface Finish (Ra)
Ra 3.2 μm typical
Finer finishes available if required.
These are general design recommendations. Final manufacturability depends on material, part geometry, feature size, and drawing requirements.
DESIGN BENEFITS
Why Follow Design Guidelines?
Good design decisions can improve machining consistency, reduce unnecessary complexity, and support more efficient production.
Better Part Performance
Reduce the risk of deformation, weak features, and functional issues.
More Consistent Machining
Design stable and accessible features for more consistent machining results.
Shorter Lead Time
Reduce unnecessary setups, tool changes, and machining complexity.
Lower Overall Cost
Avoid overengineering and reduce machining time, tooling, and production waste.
DESIGN GUIDES
All Design Guides
Explore practical CNC design guidelines for common features, tolerances, surface requirements, and machining considerations.
Wall Thickness Guidelines
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Hole & Thread Design
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Internal Corners & Radii
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Undercuts & Tool Access
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Tolerance Design
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Surface Finish Guidelines
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Design for 5-Axis Machining
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CNC Cost Optimization
Read More →Need a Design Review?
Send us your drawings or CAD files for a DFM review. Our engineering team can review key machining features and provide practical feedback.
FAQ
Design Guidelines FAQs
Find answers to common questions about CNC part design, tolerances, wall thickness, tool access, and DFM review.
What is the recommended minimum wall thickness for CNC machining?
A wall thickness of around 1.0 mm is a common starting point. Final recommendations depend on material, part size, geometry, and machining requirements.
How should I design internal corners for CNC machining?
Internal corners should include a radius whenever possible. Larger radii improve tool access, reduce machining time, and help avoid unnecessary small-diameter cutters.
How should I specify tolerances on my drawing?
Apply tighter tolerances only to critical functional and mating features. General dimensions should use practical tolerances to avoid unnecessary machining and inspection cost.
Can you review my design before machining?
Yes. Our engineering team can review your CAD files and drawings and provide DFM feedback based on machining access, feature geometry, tolerances, and production requirements.