Precision CNC Machining, From Prototype to Production

Some projects need a functional prototype; others need a precise mold component or a repeat batch of finished parts. Hexamold’s CNC machining services support these needs with custom metal and engineering-plastic components made from your CAD files. Milling, turning, finishing, and dimensional inspection are coordinated around the features and tolerances that matter to your application.

Machining Planned Around Your Critical Features

Material, geometry, and tolerances determine how a component should be machined—not every feature needs the same level of precision. We review your CAD model and technical drawing to plan machining operations, workholding, and finishing around functional requirements. Dimensional inspection checks specified features, while early feedback can identify adjustments that simplify production without compromising the part’s intended use.

High-precision vertical CNC milling machine fabricating custom steel mold components at the Hexamold manufacturing facility.

CNC Machining Processes and Capabilities

Hexamold selects the appropriate CNC manufacturing method according to each part’s geometry, material, tolerance, surface finish, and production volume. Our capabilities support functional prototypes, mold components, jigs, fixtures, and precision end-use parts for OEM and B2B manufacturing programs.

CNC milling machine producing a precision plastic prototype component
Precision CNC milling of an engineering plastic prototype for dimensional and functional validation.

CNC milling uses rotating cutting tools and controlled movement of the tool or workpiece to produce pockets, holes, contours, and other precision features. Three-, four-, and five-axis configurations provide different levels of access to complex geometry.

Typical applications: Mold components, industrial enclosures, manifolds, structural parts, and precision plastic prototypes.

CNC turning rotates the workpiece against a controlled cutting tool to produce cylindrical, threaded, tapered, and concentric features efficiently.

Typical applications: Shafts, bushings, spacers, threaded components, fittings, and valve parts.

Computer-controlled drilling produces holes with specified diameters, depths, locations, and finishes. Reaming, tapping, and boring may be added when tighter fits or threads are required.

Typical applications: Assembly holes, threaded features, cooling channels, mounting patterns, and fluid passages.

CNC routing uses high-speed cutting tools to machine large sheets and panels, particularly in plastics, composites, foam, and other relatively soft materials.

Typical applications: Equipment panels, plastic housings, templates, signage, gaskets, and large-format components.

Laser and waterjet systems cut detailed two-dimensional profiles from sheet materials. The best process depends on material type, thickness, edge-quality requirements, and sensitivity to heat.

Typical applications: Sheet-metal profiles, flat gaskets, brackets, panels, and acrylic components.

CNC grinding removes small amounts of material to achieve tight dimensional control and fine surface finishes, particularly on hardened metals and critical mating surfaces.

Typical applications: Mold inserts, bearing surfaces, sealing faces, precision gauges, and hardened tooling components.

Three-, Four-, and Five-Axis CNC Milling Capabilities

Hexamold selects three-, four-, or five-axis CNC milling according to the part geometry, feature accessibility, tolerance requirements, surface finish, material, and production volume. The right machine configuration can reduce setups, improve dimensional consistency, and efficiently produce complex custom parts from CAD data.

Three-axis CNC milling moves the cutting tool along the X, Y, and Z axes. It provides an efficient, cost-effective solution for parts with accessible features on a limited number of faces.

Typical applications: Plates, brackets, pockets, slots, equipment panels, jigs, fixtures, mold plates, and straightforward prototype components.

Four-axis CNC milling adds controlled rotation around one axis, allowing multiple sides or features around a part to be machined with fewer manual repositioning steps.

Typical applications: Components with indexed holes, curved profiles, cylindrical features, side details, mold components, and parts requiring improved alignment between multiple faces.

Five-axis CNC milling coordinates movement across three linear axes and two rotational axes. It enables the cutting tool to approach complex surfaces from multiple directions, reducing setups and improving access to difficult features.

Typical applications: Complex mold inserts, impellers, contoured surfaces, aerospace-style components, medical-device parts, precision prototypes, and components with compound angles or features on several faces.

CNC Machining Materials and Performance

Selecting the right CNC machining material affects part strength, weight, corrosion resistance, temperature performance, surface finish, machinability, and cost. Hexamold machines common metals and engineering plastics for prototypes, mold components, fixtures, and production parts. Final material selection should reflect the application, operating environment, tolerances, production volume, and compliance requirements.

Precision CNC-machined aluminum parts for custom industrial components
Precision CNC machined aluminum parts manufactured for custom prototypes, tooling, and low-volume production applications.

Key properties: Lightweight, corrosion-resistant, thermally conductive, and highly machinable.

Typical applications: Equipment housings, heat sinks, structural components, brackets, and prototype parts.

Common grades: 6061-T6 and 7075.

Key properties: High strength, corrosion resistance, durability, and cleanability.

Typical applications: Medical equipment components, food-processing parts, marine hardware, fittings, and industrial assemblies.

Common grades: 304 and 316L.

Key properties: Low weight, chemical resistance, electrical insulation, low friction, and application-specific thermal performance.

Typical applications: Bushings, insulators, fluid manifolds, wear components, and equipment housings.

Common materials: PEEK, POM/Acetal and PTFE.

Key properties: High hardness, wear resistance, dimensional stability, and suitability for heat treatment.

Typical applications: Injection-mold inserts, dies, fixtures, punches, and long-life tooling components.

Common grades: D2 and P20.

Key properties: High electrical or thermal conductivity, corrosion resistance, and good machinability depending on the alloy.

Typical applications: Electrical connectors, electrodes, busbars, heat-transfer components, fittings, and valves.

Common grades: C110 copper and C360 brass.

CNC Surface Finishing and Post-Processing

CNC-machined parts may require additional finishing to improve appearance, corrosion resistance, hardness, cleanability, or functional performance. Hexamold coordinates surface treatments according to the part material, application, tolerance, and cosmetic requirements.

Parts retain visible machining marks and can be supplied with a specified surface-roughness requirement. A typical standard finish may be approximately Ra 3.2 μm, depending on the material and machining process.

Suitable for: Internal components, prototypes, fixtures, and parts without special cosmetic requirements.

Fine abrasive media creates a consistent, non-reflective matte texture and reduces the appearance of light machining marks.

Suitable for: Housings, panels, consumer-facing components, and parts requiring a uniform cosmetic finish.

Type II anodizing improves the corrosion resistance and appearance of aluminum, while Type III hard anodizing provides greater surface hardness and wear resistance. Color options depend on the alloy and specification.

Suitable for: Aluminum housings, brackets, equipment components, and wear-resistant parts.

A controlled chemical treatment removes free iron and surface contaminants from stainless steel, helping restore its corrosion-resistant passive layer.

Suitable for: Stainless-steel medical, food-processing, marine, and industrial components.

Electrochemical finishing removes microscopic surface irregularities to improve smoothness, cleanability, corrosion resistance, and reflectivity.

Suitable for: Medical equipment, laboratory components, food-contact hardware, and precision stainless-steel parts.

Design Guidelines for CNC-Machined Parts

CNC DFM reduces machining time, cost, and quality risks. Final dimensions should be reviewed against the material, geometry, tolerance, and application.

  • Internal Radii: Use generous corner radii because round milling tools cannot produce sharp internal corners. This improves tool access and may avoid EDM.
  • Standard Features: Choose standard hole, drill, and thread sizes to reduce tool changes, cost, and lead time.
  • Cavity Depth: Avoid deep, narrow pockets that can cause tool deflection and chatter. A depth-to-width ratio near 4:1 is a useful starting point.
  • Wall Thickness: Thin walls may deform during machining. Consider at least 0.8 mm for plastics and 0.5 mm for metals, subject to engineering review.
  • Threads: Define thread size, pitch, depth, tolerance class, and whether each hole is blind or through.
  • Tolerances: Apply tight tolerances only to function-critical features to control machining and inspection costs.For drawings that use geometric dimensioning and tolerancing, engineering teams may reference ASME Y14.5, which defines widely used GD&T symbols, rules, and drawing practices.

Information Needed for a CNC Machining Quote

To prepare an accurate CNC machining quote, provide the information below. These details help Hexamold evaluate manufacturability, select suitable tools, plan inspection, and calculate cost and lead time.

  • CAD Files and Drawings: Submit STEP or IGES files with 2D drawings showing critical dimensions, tolerances, threads, and hole depths.
  • Material: Specify the required metal or plastic grade, such as 6061 aluminum, 304 stainless steel, POM, or PEEK.
  • Surface Finish: Define the required surface roughness and treatments, including anodizing, bead blasting, passivation, or electropolishing. Surface-texture requirements should be clearly specified on the engineering drawing using applicable parameters and measurement methods, such as those defined in ISO 21920-2.
  • Critical Requirements: Identify precision fits, cosmetic surfaces, inspection standards, and application-specific quality or compliance requirements.
  • Order Details: Provide prototype or production quantities, annual demand, target delivery date, and shipping destination.

CNC Machining FAQs

Hexamold provides CNC milling, turning, drilling, routing, precision grinding, and coordinated surface finishing for custom metal and plastic parts, prototypes, mold components, jigs, fixtures, and production components. CNC machining processes and selection criteria

We machine aluminum, stainless steel, tool steel, copper, brass, and engineering plastics such as POM, PTFE, PEEK, and nylon. Material selection depends on strength, temperature, chemical exposure, weight, compliance, and cost requirements.

Achievable tolerances depend on the material, geometry, feature size, machine setup, and inspection method. Specify critical tolerances on a 2D drawing so our engineers can evaluate manufacturability and provide realistic requirements.

Yes. CNC machining supports one-off functional prototypes, design-validation parts, bridge production, replacement components, and repeat production orders without requiring a dedicated production mold.

Provide a STEP or IGES model and a 2D PDF drawing showing critical dimensions, tolerances, threads, hole depths, materials, finishes, quantities, and inspection requirements.

Available options include as-machined, bead-blasted, anodized, passivated, electropolished, plated, painted, and powder-coated finishes. Compatibility depends on the part material and application.

Inspection can include dimensional measurement, visual checks, gauges, and coordinate measuring equipment according to the drawing and quality plan. Inspection reports and material documentation can be discussed during quotation.

Hexamold provides custom CNC machining from its facility in Zhangjiagang, Suzhou, Jiangsu, China, supporting OEM and B2B customers with prototypes, tooling components, production parts, inspection, finishing, packaging, and global delivery.

CNC machining cost depends on material, geometry, machining time, tolerances, surface finish, setup requirements, inspection, and order quantity. Sending complete CAD files and specifications allows Hexamold to prepare an accurate quotation. CNC machining quotations and part costs

Share your CAD files, drawings, material grade, tolerances, finish, and order quantity with Hexamold. Our engineering team will review your requirements and provide a tailored CNC machining strategy and quotation.

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