3-Axis Milling
3-axis milling for plates, brackets, pockets, housings and fixtures
PRECISION CNC MILLING SERVICES
CNC Milling
Custom CNC milling services for precision metal and plastic parts, from one-off prototypes to repeat production. Mockup reviews the model, drawing, material, tolerance, surface finish and inspection plan before selecting 3-axis, indexed 3+2, 4-axis or simultaneous 5-axis machining.
- 3 / 3+2 / 5 — AXIS STRATEGIES
- ±0.005 mm — SELECTED FEATURES / REVIEW
- CMM — DRAWING-LED INSPECTION
STEP, STP, X_T, SLDPRT, IGES, PDF and ZIP · Confidential handling
AXIS STRATEGIES3 / 3+2 / 5Confirmed against geometry, material, setup and inspection requirements.
3 / 3+2 / 5AXIS STRATEGIES
±0.005 mmSELECTED FEATURES / REVIEW
CMMDRAWING-LED INSPECTION
CNC MILLING PROCESS
What Is CNC Milling?
CNC milling is a subtractive manufacturing process that uses computer-controlled rotating cutting tools to remove material from a solid workpiece. The process creates precision features including flat surfaces, pockets, slots, holes, threads, contours and complex three-dimensional geometries. CNC milling is commonly used when parts require high accuracy, repeatability and flexible feature creation.
ROTATING CUTTING TOOLS / CONTROLLED MATERIAL REMOVALCNC MILLING CAPABILITIES
CNC Milling Services: 3-Axis, 3+2, 4-Axis and 5-Axis Machining
CNC milling removes material with rotating cutting tools while the workpiece is held in a controlled fixture. The correct axis strategy is the simplest route that reaches every feature, preserves critical datum relationships and leaves a practical inspection path.
Indexed 3+2 / 4-Axis
Indexed 3+2 or 4-axis machining for features distributed across multiple faces
Simultaneous 5-Axis
Simultaneous 5-axis milling for changing tool vectors, compound surfaces and difficult access
Integrated Operations
Drilling, boring, reaming, tapping, thread milling and secondary machining in the planned route
CUSTOM MILLED PARTS
CNC Milled Parts, Features and Engineering Applications
Milling is best suited to parts defined by faces, pockets, slots, bores, hole patterns, sealing surfaces and contoured profiles. Part category alone does not select the process; tool access, workholding and relationships between features determine the route.
01 / LIGHTWEIGHT
Aerospace
Structural brackets, fixtures and lightweight components where multi-face relationships and traceable inspection matter.
- TYPICAL PARTS
- Brackets · fixtures · structural parts
ONLINE CNC MILLING QUOTE
Get an Online CNC Milling Quote
From CAD upload to manufacturing quote in minutes. The digital workflow connects project configuration with engineering review for tight tolerances, GD&T, thin walls, deep cavities, difficult access, specialty materials and advanced multi-axis machining.
Upload CAD & Drawings
Send the 3D model, controlled drawing and revision so geometry and requirements stay connected.
Configure Requirements
Select material, quantity, finishing, inspection documentation and target timing.
Engineering Review & Quote
Manufacturing engineers review process fit, tolerances, access, workholding and project risk before release.
Manufacturing to Delivery
Approved projects move through machining, inspection, protected packaging and delivery in one workflow.
CNC MILLING TOLERANCES
CNC Milling Tolerances, Accuracy and Surface Roughness
A blanket machine accuracy is not a finished-part promise. Achievable tolerance depends on feature size, material, wall stiffness, tool reach, workholding, setup transfers, thermal stability, finishing and measurement uncertainty. The approved drawing controls acceptance.
- ✓Selected linear features may be reviewed down to ±0
Selected linear features may be reviewed down to ±0.005 mm when geometry and inspection support it
- ✓Position, profile, flatness and perpendicularity are evaluated from the stated datum reference frame
Position, profile, flatness and perpendicularity are evaluated from the stated datum reference frame
- ✓Bores, threads and fits require the callout, mating function and inspection method
Bores, threads and fits require the callout, mating function and inspection method
- ✓Surface roughness should be specified only where sealing, sliding, fatigue, optical or cosmetic function requires it
Surface roughness should be specified only where sealing, sliding, fatigue, optical or cosmetic function requires it
PART SIZE & WORKHOLDING
CNC Milling Part Size, Machine Envelope and Setup Planning
Maximum travel is not the same as usable part capacity. Fixtures, rotary tables, tool holders, probing clearance and the need to reach multiple sides reduce the working envelope. Mockup checks stock size, finished dimensions, weight, tool access and inspection access before confirming a machine route.
- 01
Provide the overall stock and finished-part dimensions
- 02
Identify faces that cannot carry clamp marks or sacrificial stock
- 03
Show critical relationships that should remain in one setup
- 04
Large, thin or tall parts require a specific distortion and support plan
CNC MILLING MATERIALS
Metals and Plastics for CNC Milling
Material grade, temper, stock form and condition affect cutting force, heat, chip control, tool wear, burr formation and dimensional movement. Substitutions are not made from a family name alone.
LIGHTWEIGHT METAL
Aluminum
Strong machinability and broad finishing options for housings, brackets, heat sinks and structural parts.
- GRADES / OPTIONS
- 6061-T6 · 7075-T6 · 2024
- FINISH / NOTES
- Anodizing · chem film · bead blast
SURFACE FINISHING
Surface Finishes for CNC Milled Parts
Finishing must be planned before machining because coating thickness, masking, edge condition and cosmetic preparation can change fit and final dimensions. Critical interfaces are evaluated in the delivered condition.
IMAGEFINISHAPPLICABLE MATERIALSCOLOR / APPEARANCEPROCESS NOTES
Aluminum
Clear, black or specified colors
Corrosion protection and appearance; allow for buildup
Aluminum
Durable technical finish
Improved wear resistance; masking may be required
Aluminum
Clear to gold
Conversion coating for corrosion protection and conductivity
Stainless steel
Natural metallic finish
Corrosion resistance or smoother surface by specification
Compatible metals
Matte or directional texture
Define cosmetic zones and protect functional surfaces
Process-compatible materials
Specified color or cosmetic finish
Mask fits, threads and electrical contact areas
CNC MILLING DFM
CNC Milling Design Guidelines for Lower Cost and Better Stability
The most effective milling DFM reduces long-reach cutting, weak walls, unnecessary setups and inspection ambiguity without changing functional interfaces.
Use the largest practical internal corner radius and avoid deep narrow pockets
Use the largest practical internal corner radius and avoid deep narrow pockets
Keep wall thickness and unsupported height appropriate to the material
Keep wall thickness and unsupported height appropriate to the material
Use standard hole, reamer and thread sizes with adequate tool access
Use standard hole, reamer and thread sizes with adequate tool access
Apply tight tolerances and fine surface finish only to functional features
Apply tight tolerances and fine surface finish only to functional features
Dimension critical features from datums that manufacturing and inspection can reproduce
Dimension critical features from datums that manufacturing and inspection can reproduce
CNC MILLING QUALITY
CNC Milling Quality Control and Inspection Reports
Inspection planning begins with drawing reconciliation. The model defines nominal geometry; the drawing defines datums, tolerances, threads, finishes and reporting requirements. Measurement equipment is selected for the feature and uncertainty required.
- ✓Revision, units, material and finish reconciliation before release
- ✓In-process checks for tool wear, offsets and setup transfer
- ✓Final dimensional and visual inspection against the approved drawing
- ✓CMM data, first-article reports and certificates when included in the quotation
PROTOTYPE TO PRODUCTION
Prototype, Low-Volume and Production CNC Milling
Prototype machining proves geometry and assembly fit; production machining must also control repeatability, tool life, fixture loading, inspection sampling and revision history. Approved process learning should carry into repeat orders.
One-off engineering prototypes and functional validation parts
One-off engineering prototypes and functional validation parts
First articles and pilot quantities before production release
First articles and pilot quantities before production release
Dedicated workholding and tool-life controls when volume justifies them
Dedicated workholding and tool-life controls when volume justifies them
Controlled revisions, deviations and inspection expectations for reorders
Controlled revisions, deviations and inspection expectations for reorders
CNC MILLING RFQ
What to Include in a CNC Milling Request for Quote
A complete RFQ lets engineering choose the axis strategy, stock, fixture, finishing and inspection route without hiding assumptions in the price.
Get an online CNC milling quote↗STEP / STP / PARASOLID + PDF DRAWING RECOMMENDEDCNC Milling FAQs
What is the difference between 3-axis and 5-axis CNC milling?+
Three-axis milling cuts with X, Y and Z motion and is efficient for accessible prismatic geometry. Indexed 3+2 reorients the part between cuts. Simultaneous five-axis coordinates rotary and linear motion for continuously changing tool orientation or difficult access.
What tolerances can CNC milling achieve?+
Tolerance is feature-specific. Selected features may be reviewed down to ±0.005 mm, but the result depends on geometry, material, workholding, tool reach, setup count, finishing and inspection method. The approved quotation and drawing control.
Which file formats should I send?+
Send a STEP, STP or Parasolid solid model and a PDF drawing defining datums, tolerances, GD&T, threads, material, finish and inspection requirements.
Can you mill both metals and plastics?+
Yes. Common materials include aluminum, steels, stainless steel, titanium, copper alloys and rigid engineering plastics. Exact grade, temper and stock form are confirmed during review.
How do I reduce CNC milling cost?+
Increase internal radii, reduce unnecessary pocket depth, keep features accessible, use standard holes and threads, limit tight tolerances to functional interfaces and identify only the surfaces that require cosmetic finishing.
Can prototype milling scale to repeat production?+
Yes. The program, workholding, tool list, approved revision and inspection results can be retained and refined for pilot and repeat orders.