Industrial Machining

Industrial Design

Every day, we interact—directly or indirectly—with countless devices and machines that contain metallic components. These parts either enable their operation or were essential in the manufacturing process that brought them to life.

Types of machining

Machining is generally defined as a manufacturing process composed of multiple material removal operations. As the term suggests, it involves removing excess material from an initial workpiece—metallic or not—to obtain a new part with specific, defined characteristics.

Because industrial machining encompasses an entire family of material removal processes, it can be classified into three main categories:

Conventional machining

This family of processes uses a cutting tool to remove material. It includes operations such as turning, drilling, milling, profiling, planing, reaming, and sawing.
These are the most common and widely used techniques across manufacturing industries.

Abrasive processes

In these operations, material is removed through the action of abrasive particles that wear away the surface. This category includes grinding, sharpening, lapping, honing, and superfinishing.

Abrasive machining is typically used for fine surface finishes or precise dimensional control.

Non-Conventional machining

This group covers processes that do not rely on cutting tools or abrasives. Instead, they use various forms of energy to remove material.

Mechanical / Electromechanical Energy:
Includes ultrasonic machining, water jet cutting, abrasive water jet cutting, and abrasive jet machining.

Thermal Energy:
Uses extremely high temperatures to melt or vaporize material. Examples include electrical discharge machining (EDM), electron beam machining (EBM), laser beam machining (LBM), and plasma arc machining.

Chemical Energy:
Involves chemical reactions to dissolve unwanted material. Processes such as chemical milling, chemical drilling, chemical etching, and photo-chemical machining operate under this principle.

CNC Machining

CNC (Computer Numerical Control) machining centers represent a major evolution in manufacturing technology. Unlike traditional lathes or milling machines that rely heavily on manual operation, CNC machines perform multiple machining operations automatically through digital control.

This automation ensures higher efficiency, reduced production time, and superior quality consistency compared to conventional machines.

CNC machining centers are classified as horizontal, vertical, or universal, depending on the spindle orientation—an essential factor that determines the type and complexity of parts that can be produced.

Abrasive jet machining

This process should not be confused with abrasive water jet cutting.
In abrasive jet machining, a high-speed stream of gas mixed with fine abrasive particles is used to erode material from the workpiece surface.

Operating pressures range from 0.2 to 1.4 MPa (approximately 2 to 14 bar). To visualize this, standard compressed air systems in industrial automation typically operate between 4 and 8 bar.

The abrasive mixture passes through a nozzle with a diameter between 0.0075 and 1.0 mm, reaching velocities from 2.5 to 50 m/s.
Common carrier gases include dry air, nitrogen, carbon dioxide, and helium.

This technique is ideal for delicate or heat-sensitive materials where thermal distortion must be avoided.

Turning operations

A lathe is a machine tool that removes material from a rotating workpiece using a cutting tool that advances linearly toward it.
This process allows precise shaping and finishing of cylindrical components.

Common turning operations include:

Facing: Creates a flat surface on the end of the part.
Taper Turning: Produces a conical surface.
Contour Turning: Follows a defined profile or shape.
Forming: Uses a tool with a specific profile to imprint the same shape on the workpiece.
Chamfering: Cuts an angled edge on corners.
Parting (Cutoff): Separates a finished piece from the bar stock.
Threading: Cuts helical grooves (threads) into the part.
Drilling / Boring: Creates or enlarges holes.
Knurling: Produces textured or patterned surfaces for grip.

Examples of machined components

Industrial machining enables the creation of an almost limitless range of parts.
Common examples include:

Gears
Punches
Clamping blocks
Linear guides
Screws and fasteners
Robotic tooling components
Welding and assembly table fixtures
Rollers and shafts
Pistons
Clamp arms
Tool guides

These components are essential across numerous production environments—from robotic automation systems to precision tooling.

Industrial applications

Machining requirements vary widely by industry:

Electronics: Components are small, precise, and often made from non-ferrous materials.
Automotive and Aerospace: Parts include die components (guides, punches, nests) and fixture elements for welding and assembly, often requiring extremely tight tolerances.
Pharmaceutical and Food Industries: Machined parts must meet hygienic and corrosion-resistant standards to prevent contamination or oxidation.

Each sector demands different materials, finishes, and tolerances—but all share the same goal: reliability and precision in production.

Conclusions

As we’ve seen, industrial machining covers a vast field of technologies and processes that continue to evolve with modern manufacturing.
Understanding its basic principles is the first step toward mastering this ever-expanding world—one where even conventional machines can produce extraordinary results.

Thanks to continuous technological development, machining remains a cornerstone of industrial progress—transforming raw materials into precision components that power the systems and products improving everyday life.

Sources

Groover, Mikell P. Fundamentals of Modern Manufacturing, 3rd Edition, 2007, McGraw-Hill.

Eraso Guerrero, Omar. Manufacturing Processes in Industrial Engineering, 2008, UNAD.