CNC Drilling

Custom CNC Drilling Services

Drilling involves using drill bits (multi-point cutting tools) to produce cylindrical holes in solid materials. Furthermore, drill bits used for this procedure feature two spiral channels. These channels, also known as flutes, evacuate the swarf or chips out of the hole as the drill bit progresses into the material.

Spot Drilling

Spot drilling is the initial step in many CNC drilling processes to establish a "point" or guide for subsequent drilling operations. This operation requires creating a small indentation in the workpiece surface to ensure that the drill bit is accurately positioned during the main drilling operation.

Drilling

At the heart of CNC drilling operations is drilling itself, the process of creating cylindrical holes in a workpiece using a rotating drill bit. This operation can be performed on various materials, including metals, plastics, and composites, with precision and speed.

GM-PRE CNC Drilling services include specialized Deep Hole Drilling for applications requiring high aspect ratio holes (length-to-diameter ratio up to 20:1). Using advanced drilling techniques and precision equipment, we ensure accurate hole alignment and surface finish, even in challenging materials.

CNC Drilling With GM-PRE

CNC (Computer Numerical Control) drilling services are at the forefront of precision engineering. The process offers tailor-made solutions to meet the demanding needs of different industries. CNC drilling is characterized by precision and customization. It ensures that every hole drilled meets the strictest tolerances and specifications. Whether the task is a single prototype or a large-scale production run, the CNC drilling process guarantees accuracy every step of the way.

We offer CNC drilling services for small and high volume parts of all levels of complexity. We use many types of drilling machines, suitable for a variety of different metal materials, according to your needs, for you to customize simple or complex pattern drilling.

For complex components, we offer integrated solutions like Investment Casting → 5-Axis CNC → EDM Hole Drilling. Investment casting provides near-net-shape preforms, which are then precision-machined using 5-axis CNC for complex geometries. EDM hole drilling adds micron-level precision for intricate holes, ensuring compatibility with tight-tolerance assemblies. This multi-step process is perfect for medical implants, aerospace fasteners, and high-precision tooling, delivering parts with superior accuracy and mechanical properties.

CNC Materials

Materials Available at Guanmei PRE

Available Surface Treatment

Anodizing/Hard Anodizing

Mainly used for aluminum alloy parts, it forms an oxide film through electrolysis to improve corrosion resistance, surface hardness and aesthetics.

Hard Anodizing is a thickened version with higher wear resistance and insulation, suitable for mechanical friction parts.

Nickel Plating

A layer of nickel metal is deposited on the surface of CNC metal parts to enhance corrosion resistance, wear resistance and appearance brightness.

It is divided into chemical nickel plating (electroless nickel plating) and electrolytic nickel plating. The former is suitable for high-requirement precision parts.

Zinc Plating

A layer of zinc is plated on the surface of steel parts to form an anode protection to prevent rust.

You can choose different appearances such as colored zinc, white zinc, and black zinc.

Black Oxide

A black oxide film is formed on the surface of steel or stainless steel, mainly providing mild rust prevention, anti-light reflection, and aesthetics.

It does not significantly change the size of the parts and is suitable for parts that require both appearance and rust prevention.

Electropolishing

Use electrochemical methods to dissolve small amounts of stainless steel or titanium alloy parts, making the surface smoother, cleaner and free of microburrs.

Improves corrosion resistance and cleanliness, commonly used in the medical, food, and electronics industries.

Blasting

Cleaning or roughening of surfaces with high-pressure blasting of sand/glass beads/ceramic particles, removal of burrs, scale or preparation of adhesion layers.

Suitable for surface pretreatment or matte effects.

Polishing

Grind and polish the metal surface by mechanical means to obtain a high-gloss, mirror-like or delicate surface.

It is mostly used for part appearance processing, decorative processing or surface roughness control.

Passivation

Mainly used for stainless steel, it removes free iron and impurities through chemical treatment, forms a more stable passivation film, and improves corrosion resistance.

It does not change the size, but can significantly extend the service life of parts.

Dacromet

It is a zinc-chromium coating that provides strong anti-corrosion protection on the surface of steel parts, especially suitable for salt spray environment.

It does not contain heavy metals, is more environmentally friendly, and is often used to replace electrogalvanizing.

Powder Coating

The dry powder is attached to the surface of the parts through electrostatic spraying, and then baked to form a strong, wear-resistant and corrosion-resistant coating.

It has various colors, is environmentally friendly and solvent-free, and is not easy to peel off.

Painting

Traditional surface coating method, you can choose different colors and paint types (such as anti-corrosion paint, high temperature resistant paint).

Used for aesthetics, identification, and basic protection purposes.

PVD

A very hard, thin, wear-resistant ceramic coating (such as TiN, CrN) is physically deposited on the metal surface.

It not only improves the surface hardness, but also achieves a metallic luster or black gold appearance.

MIL-A-8625F Type II anodizing improves corrosion resistance and can serve as a base for paint and other surface finish treatments.
Note: The anodizing effect may vary depending on the material.
Additional notes:
Dyes can be used to affect the surface color of the parts.
Type II coatings are prone to wear and may bleach or fade after prolonged exposure to direct sunlight.
Custom colors are available (Pantone).

Applications of CNC Drilling

Aerospace Components

CNC drilling technology is used to create precision holes in aircraft structures, including wings and fuselages, as well as engine components such as turbine blades and jet engine casings. It excels in the use of advanced composite materials and lightweight alloys, which are essential to improving fuel efficiency and reducing the overall weight of aircraft.

Automotive Parts

CNC drilling is widely used in the automotive industry to manufacture critical components such as engine blocks, transmission components, brake systems; Cooling holes & bolt holes in automobile engine cylinder blocks. CNC drilling technology is used to ensure that holes in engine components are precisely aligned, ensuring optimal functionality and reliability in the vehicle.

Electronics industry

In the world of electronics manufacturing, CNC drilling is used to create precise holes in printed circuit boards (PCBs). These holes are critical to component assembly, allowing for the precise placement of electronic parts. As demand for miniaturization in electronic devices continues to grow, CNC drilling technology can create complex and fine holes with extreme precision.

Advantages of CNC Drilling

CNC drilling offers high precision, repeatability, and efficiency for producing complex parts from a wide range of materials.

Tool&Equipment

CNC Drilling Machines: We utilize high-precision CNC drilling machines with multi-axis capabilities, enabling simultaneous machining of complex hole patterns. These machines are equipped with automatic tool changers and real-time monitoring, ensuring consistent quality across large production runs.

Specialized Drill Bits: Our inventory includes CNC drill bits tailored for various materials. For aluminum, we use CNC drill bits for aluminum with optimized cutting edges to reduce heat generation and improve chip evacuation, resulting in cleaner holes and extended tool life. Additionally, CNC machine drill bits for stainless steel, brass, and composites ensure efficient material removal and precise hole formation, even in hard-to-machine alloys.

Disadvantages of CNC Drilling

While CNC drilling has various advantages, it also has some significant limitations and disadvantages

1. High equipment cost

CNC drilling machines are expensive, especially high-precision, multi-axis machines with automatic tool changing systems.
The initial investment is large, which puts a lot of financial pressure on small and medium-sized enterprises.

2. High requirements for operation

Professional technicians are required to program and debug, and beginners are slow to get started.
Unskilled operation may lead to processing errors, equipment damage or safety accidents.

3. Processing speed is limited

Small holes and high-precision holes (such as PCB microvias) have a slow drilling speed, which limits the production cycle.
For hard materials or multi-layer composite materials, the processing time is longer and the tool wears faster.

4. Limited geometry

Only “circular holes” or holes at specific angles can be processed, and complex special-shaped holes cannot be easily achieved like laser cutting.
If special-shaped holes are required, subsequent milling processes are required.

Why Choose GM-PRE For Custom Drilling

Material Versatility

GM-PRE masters the machining of 40+ materials, from aerospace-grade titanium (Ti-6Al-4V) to medical high-temperature Inconel. Whether you need lightweight aluminum for automotive chassis, biocompatible stainless steel (316L) for surgical tools, our expertise ensures optimal material performance.

Cross-Industry Expertise

With 15+ years of experience, GM-PRE delivers precision-milled components for aerospace, medical, automotive, and other sectors. We can craft titanium engine mounts for supersonic drones and micro heat sinks for AI servers, our engineers understand industry-specific challenges.

Quality Assurance & Certifications

Every GM-PRE part is backed by ISO 9001, ISO 16949 certifications, with full traceability from raw material to final inspection. Our 100% dimensional checks (CMM/3D scanning), X-ray testing for aerospace welds, and RoHS-compliant finishes guarantee reliability.

In addition to traditional CNC drilling, we offer EDM hole drilling services for ultra-precise, micro-drilling applications. EDM technology is ideal for creating tiny holes (down to 0.1mm) in hardened materials, ceramics, or composites, where conventional drilling methods may fail. This service is crucial for electronics (PCB vias), medical devices (microneedles), and aerospace (cooling holes in turbine blades), providing unmatched precision and surface quality for critical components.

CNC Drilling

Custom CNC Drilling Services

Spot Drilling

Drilling

CNC Drilling With GM-PRE

CNC Materials

Aluminum

Brass

Copper

Stainsteel