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Custom CNC Milling Solutions

Built around the features that matter.

GPT Precision provides custom CNC milling services for metal and engineering-plastic components, from prototypes to repeat orders.

We review part geometry, critical features and finished-part requirements together to help align manufacturing, finishing and inspection with your assembly needs.

Conceptual milled housing with functional featuresAn illustrative housing highlighting a pocket, a hole pattern and a reference face. Not a customer part or capability specification.Pocket accessHole patternReference face
Pocket access · Hole pattern · Reference faceConcept illustration · functional features shown for discussion

Start with how your part fits and functions.

CNC milling produces the faces, profiles, slots, pockets and holes that help components fit, align and function within an assembly.

Understanding which features matter most helps guide manufacturing decisions and inspection priorities.

Mounting Plates & Brackets

Equipment mounting plates, sensor brackets and adapter components often depend on accurate relationships between mounting faces, hole patterns and locating features.

Identify the reference surfaces and dimensions that control positioning and alignment.

Carcasas & Pocketed Components

Machined housings, enclosures and pocketed blocks may combine internal cavities, mounting features and functional surfaces.

Pocket depth, internal radii, wall thickness and tool access should be reviewed alongside clearance, sealing and assembly requirements.

Multi-Face Components

Components with features on several faces require attention to how those features relate to one another.

Defined datums and critical feature relationships help guide workholding, machining setups and final inspection.

These examples illustrate typical component categories. The appropriate manufacturing approach is determined by the complete drawing and project requirements.

Review the part as a whole.

Geometry, material condition, workholding and the sequence of operations can influence one another.

Reviewing these requirements together helps identify potential manufacturing constraints and clarify the scope before production begins.

Function & Geometry

Understand the features that control fit.

Share the current drawing revision, the part's intended function and its critical dimensions.

Deep pockets, thin walls, internal corners and restricted tool access may influence tool selection, workholding and machining sequence.

Material & Finished Condition

Consider the part beyond the milling operation.

Material grade, supplied condition and subsequent treatments can influence machining decisions and dimensional stability.

Identify surfaces requiring grinding, coating or other operations, especially where final fits or surface conditions are critical.

Inspección & Repeat Orders

Establish clear requirements for acceptance.

Define the critical feature relationships, inspection requirements and documentation needed for the project.

For repeat orders, maintain clear reference to approved drawing revisions and communicate changes to geometry, material, finish or acceptance requirements.

Select the machining approach for the part.

Different geometries may call for different milling strategies.

  • 3-Axis Milling: Suitable for many accessible faces, pockets, slots and hole patterns using appropriate setups.
  • Indexed or 3+2 Machining: May help machine features at different orientations by repositioning the workpiece or tool axis between operations.
  • Simultaneous 5-Axis Machining: May be considered for complex surfaces or features requiring coordinated changes in tool orientation during cutting.

The suitable approach depends on geometry, tool access, workholding, setup requirements and the relationships between critical features.

Where turning, grinding or other secondary operations are needed, these requirements are considered as part of the overall manufacturing scope.

MATERIALS & FINISHING

Define the part as it will be delivered.

Material grade, supplied condition and finishing requirements all contribute to the finished component.

Specify the applicable material standard, operating environment and any restrictions on substitutions. Identify which surfaces are functional, which are cosmetic and which require additional processing.

Final dimensional and surface requirements should account for the agreed manufacturing and finishing sequence.

Requirements to Identify

  • Material: Grade, applicable standard and supplied condition.
  • Functional surfaces: Mating faces, critical fits and contact areas.
  • Surface requirements: Surface texture, appearance and edge condition.
  • Further processing: Grinding, coatings or treatments, including areas requiring masking.
  • Final dimensions: Features that must meet specifications after finishing.

Materials for CNC Milling Projects

Material selection depends on the component's function, operating environment, geometry and finished-part requirements.

Representative grades and material families for project discussion include:

Aluminum Alloys

6061, 7075, 2024, 5052 and 6082.

Stainless Steels

303, 304/304L, 316/316L and 17-4PH.

Tool & Engineering Steels

P20, H13, 40Cr, GCr15 and other grades specified for the application.

Titanium Alloys

Ti-6Al-4V and commercially pure titanium grades.

Copper & Copper Alloys

C1100, C3604 and specified brass or bronze grades.

Engineering Plastics

POM, PEEK, PC, PA66, PTFE and other specified engineering thermoplastics.

These are representative materials for discussion, not a statement of current stock availability. Exact designations, normas, material condition and sourcing requirements are confirmed during project review.

Coordinate milling, grinding and finishing.

Some components need more than CNC milling to achieve their required dimensions, surface condition or assembly fit.

Where grinding, coating or other finishing operations are specified, we review how these processes relate to the machined features and final acceptance requirements.

Identify critical mating faces, sealing surfaces and finished dimensions early so the processing sequence can be considered as a whole.

QUALITY & INSPECTION

Inspect what matters to the assembly.

For milled components, dimensional verification should focus on the features that influence fit, alignment and function.

Reference faces, hole locations, pocket dimensions and geometric relationships between surfaces may all require particular attention.

Inspection priorities, methods and documentation are agreed according to the drawing and project requirements.

Incoming Requirements

Review the specified material grade, supplied condition and supporting documentation required for the project.

In-Process Checks

Identify critical dimensions and related features that should be verified during machining, particularly where later operations may affect access or dimensional relationships.

Finished-Part Acceptance

Confirm the approved drawing revision, required finished condition, acceptance criteria and agreed inspection records before delivery.

Explore Quality & Inspection ↗

Questions before you send your drawing.

Can one component require both CNC milling and turning?

Yes. A component may combine milled surfaces, pockets and mounting features with cylindrical geometry.

Share the complete drawing or model so the manufacturing sequence and relationships between features can be reviewed together.

Is 3-axis milling sufficient for my part?

Often, yes. Many components with multiple machined faces can be produced using suitable setups and workholding arrangements.

Multi-face geometry does not automatically require simultaneous 5-axis machining.

Tool access, feature relationships, setup requirements and inspection needs help determine whether 3-axis, indexed or 5-axis machining is appropriate.

What should I specify for internal corners and edges?

Define mating-part clearances, acceptable internal radii and functional edge requirements.

Internal corners produced by rotating milling cutters generally retain a radius. If a sharp internal corner is essential, identify it for review of an alternative design or secondary operation.

Include deburring and edge-break requirements where they affect assembly, handling or performance.

Can prototype and repeat-production requirements be reviewed together?

Yes. Share the initial quantity, expected repeat demand and any anticipated design or material changes.

This helps establish the manufacturing and inspection requirements for the prototype while identifying considerations for subsequent orders.

YOUR NEXT COMPONENT

Share your drawing. Define the next step.

Tell us what your component needs to do and which features matter most.

Send the current drawing or 3D model, material specification, cantidad y fecha de entrega prevista. Include critical dimensions, finishing requirements, inspection documentation and any special packaging needs.

GPT Precision can review the information, identify questions requiring clarification and discuss the manufacturing scope before quotation.

Drawings & Revisions

Current 2D drawing, available 3D model and revision information.

Material & Quantity

Specified material and condition, initial quantity and anticipated repeat demand.

Acceptance & Delivery

Critical features, finishing requirements, inspection records, packaging and target timing.

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