CNC Milling Design Guide
BoValley evaluates part geometry, material, tolerances, surface finish, and quantity to support a practical machining plan.
Get the Guide With Your QuoteCustom CNC Milling for Precision Parts
BoValley provides custom CNC milling services for metal and plastic components, from functional prototypes to low-volume and production parts. We machine precision features such as pockets, slots, holes, contours, and mounting surfaces to meet your design and functional requirements.
Project Review
- Drawing Review
- Material Grade Review
- Datum and Tolerance Planning
- Inspection Requirements
- Part Geometry
- Pockets, slots & contours
- Setup Planning
- Tool access review
- Stock Type
- Metals & engineering plastics
Overview
What is CNC Milling?
CNC milling uses rotating cutting tools to remove material from a workpiece, creating flat surfaces, pockets, slots, holes, contours, and other engineered features.
It is well suited to components that require defined geometry, accurate mounting interfaces, and consistent dimensional relationships. Depending on the part design, milling can be combined with drilling, tapping, boring, and other machining operations.
CNC Milling Capabilities
Review cutter access, pocket depth, corner radii and workholding against the drawing. Identify mating surfaces and other features that need dimensional or finish control.
3-Axis CNC Milling
- Produces flat surfaces, pockets, slots, and common prismatic features.
- Supports machining around multiple sides of a part with rotary positioning.
- Helps manufacture complex geometries and features at multiple orientations.
- Focuses on drawing-defined dimensions, critical features, and surface finish.
4-Axis CNC Milling
- Produces flat surfaces, pockets, slots, and common prismatic features.
- Supports machining around multiple sides of a part with rotary positioning.
- Helps manufacture complex geometries and features at multiple orientations.
- Focuses on drawing-defined dimensions, critical features, and surface finish.
5-Axis CNC Milling
- Produces flat surfaces, pockets, slots, and common prismatic features.
- Supports machining around multiple sides of a part with rotary positioning.
- Helps manufacture complex geometries and features at multiple orientations.
- Focuses on drawing-defined dimensions, critical features, and surface finish.
Production CNC Milling
- Produces flat surfaces, pockets, slots, and common prismatic features.
- Supports machining around multiple sides of a part with rotary positioning.
- Helps manufacture complex geometries and features at multiple orientations.
- Focuses on drawing-defined dimensions, critical features, and surface finish.
Materials & Part Geometry
- Produces flat surfaces, pockets, slots, and common prismatic features.
- Supports machining around multiple sides of a part with rotary positioning.
- Helps manufacture complex geometries and features at multiple orientations.
- Focuses on drawing-defined dimensions, critical features, and surface finish.
Tolerances & Finishes
- Produces flat surfaces, pockets, slots, and common prismatic features.
- Supports machining around multiple sides of a part with rotary positioning.
- Helps manufacture complex geometries and features at multiple orientations.
- Focuses on drawing-defined dimensions, critical features, and surface finish.
MaterialsMaterials
CNC Milling Materials
Select a metal or engineering plastic based on part function, cutter access, and the required surface finish. Confirm the grade and stock form during review.
- Aluminum
- Stainless Steel
- Carbon Steel
- Brass
- Copper
- Aluminum 6061
- Aluminum 7075
- Stainless Steel 304
- Stainless Steel 316
- POM (Acetal)
- Pocket depth and tool access
- Internal corner radii
- Flatness after material removal
- Clamping allowance
- Alloy and temper
- Strength in service
- Wear at mating surfaces
- Corrosion resistance
- Electrical isolation
- Heat exposure
- Dimensional stability
- Stock availability
- Grain or fiber direction
- Machinability
Surface Finish Options
Choose suitable surface finishes to meet your part’s appearance, durability, corrosion resistance, and functional requirements.
| Parameter | Project Considerations |
|---|---|
| Part geometry | Pockets, slots, holes, contours, and complex features |
| Material | Aluminum, steel, brass, copper, and engineering plastics |
| Tolerances | Based on engineering drawings and part requirements |
| Surface finish | As-machined or specified finishing |
| Quantity | Prototypes, low-volume orders, and production parts |
| Inspection | Critical dimensions and agreed inspection documentation |
The Process
How Does CNC Milling Work?
From CAD review and DFM planning to CNC machining, inspection, surface finishing, and delivery, each step supports efficient, precision part manufacturing.
The advantages
- Complex Features:• Machine pockets, slots, holes and detailed contours from engineering drawings.
- Functional Interfaces:• Focus on mounting surfaces, hole patterns and mating features that affect assembly.
- Material Flexibility:• Select metals and engineering plastics based on functional and environmental needs.
The challenges
- Prototype to Production:• Support design validation, functional samples and suitable repeat orders.
- Finishing Options:• Consider anodizing, blasting, painting and other compatible finishing processes.
QualityApplications for CNC Milling
The examples below show where this process may fit. Material, geometry, and the intended use determine the right approach for each part.
Automotive Components
Brackets, housings, and mechanical components.
Robotics
Mounting plates, supports, and structural components.
Aerospace Prototypes
Custom components subject to project specifications.
Optical Equipment
Instrument housings and precision mounting parts.
Electronics & Telecommunications
Precision CNC machined housings, heat sinks, and electronic components.
Industrial Machinery
Custom machined parts for automation systems and industrial equipment.
| Types of Parts | Function |
|---|---|
| Mounting plates | Locate holes and datums for repeatable installation. |
| Housings and pockets | Provide space for components and controlled mating features. |
| Machining fixtures | Create locating faces, slots, and threaded mounting features. |
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