What is part machining?

In today's competitive industrial environment, the machined part is the silent component that underpins the functionality and reliability of complex systems, from automotive to aerospace. For production managers and machine shops seeking efficiency, understanding the nature of these components is not just a theoretical matter, but the key to optimizing costs and raising the quality of the final product.

Machining guarantees tolerances that other manufacturing methods cannot achieve. If your goal is to integrate high-performance components into your value chain, it is essential to understand the methodologies, geometries and engineering criteria that define a part of superior quality.

What a machined part is

Technically, a machined part is defined as a manufactured solid obtained through material removal processes, known as subtractive manufacturing or “chip removal”. Unlike casting, where the material is shaped in a mold, or 3D printing, which builds it up additively, the machined part emerges from sculpting an initial block (preform or billet) until the exact geometry of the CAD design is achieved.

This process is based on the physical interaction between a very hard cutting tool and the workpiece, generating plastic deformation that fractures the material in the form of chips. The superiority of this method lies in its ability to offer:

• Micrometric tolerances: Fits in the micron (µm) range, impossible for standard molding.

• Mirror surface finishes: Roughness grades (Ra) below 0.1 µm.

• Structural integrity: Retains the isotropic properties of the base material, crucial for parts subject to fatigue.

To achieve these results without compromising tool life or part integrity through excess heat, robust machinery is vital. At Vurcon, we understand that "machining efficiency" depends on machines capable of handling these cutting forces with stability and precision.

Types of parts by geometry

The morphology of the part is the deciding factor in choosing the right machine tool and designing the clamping strategy.

Cylindrical formats

Known in engineering as "solids of revolution", these parts make up a large proportion of industrial machining and are mainly produced by turning. In this process, the part rotates about its axis while the tool defines the profile.

The critical quality factor in these formats is concentricity: all diameters must share a common axis to avoid vibration (run-out) in operation. For this type of work, the range of Vurcon PL CNC lathe series (such as the PL-63 or PL-50) offers the bed rigidity needed to guarantee dimensional accuracy on shafts and bushings, with intuitive controls such as Fagor or Siemens to make operation easier.

Prismatic formats

Prismatic parts are characterized by geometries based on rectangular blocks, orthogonal planes and contours without rotational symmetry. Their manufacture is the domain of milling, where the part remains stationary and the tool rotates. To tackle these complex geometries, the Vurcon machining centers (VL and DC Series) are equipped with linear roller guides and preloaded ball screws.

However, even with the best machinery, there are 3 common mistakes that ruin accuracy in these parts and that we work to prevent in our consulting:

1. Inadequate clamping: Excessive clamping force deforms the part elastically, and it returns to its original (and incorrect) shape when released. Using low-quality vises causes vibrations that are lethal to the finish.

2. Thermal vibration: Failing to control shop or coolant temperature causes the material to expand during long cycles, taking the part out of tolerance (especially in aluminum).

3. Poor chip evacuation: In deep pockets, if chips are not evacuated, the tool cuts them again ("recutting"), damaging the surface and breaking cutting edges.

Our machines integrate optimized cooling and evacuation systems to mitigate these risks, ensuring the stability needed to maintain perpendicularity and flatness.

Precision components

This category covers parts that require extreme tolerances or free-form geometries, regardless of their basic shape. Here we find molds, dies and aerospace components that demand mirror surface finishes (Ra < 0.05 µm).

Mold and die making is one of the key sectors where Vurcon technology stands out, offering machines with high RPM (up to 10,000) and advanced Fanuc controls with “Manual Guide i” to handle the complex finishing toolpaths these surfaces require.

How a part is produced by machining

The production cycle of a machined part is an integrated sequence that runs from digital engineering to physical inspection.

1. Engineering and CAM: Before cutting, the CAD model is processed in CAM software to define strategies and prevent collisions.

2. Roughing: The aim is the maximum Material Removal Rate (MRR). Here the priority is speed, not finish, leaving stock for the next stage.

3. Finishing: The focus shifts to dimensional accuracy and surface quality (Ra), using light cuts and high spindle speeds.

Key differences between stages:

At Vurcon we don't just supply the machine; through Vurcon Academy, we train your team in programming and operation to optimize these stages, ensuring that maximum performance is extracted from every work cycle.

Common examples in industry

The versatility of CNC machining makes it possible to manufacture everything from massive components to microscopic elements.

Shafts and pins

Vital for power transmission. They often require longitudinal splines to transmit high torques, which are machined to optimize contact and reduce stresses. These components are usually made from low-alloy steels and subsequently ground to ensure the bearing fit.

Brackets and housings

They act as the skeleton of the machinery. A common challenge in sectors such as aerospace is machining thin walls to reduce weight. These walls can vibrate during cutting, so high-speed machining (HSM) strategies and specific tools are required.

Our machining centers, such as the VL-106, feature part cooling systems and rigid tapping, essential features for working aluminum or cast-iron housings with maximum reliability.

Gears and transmission elements

It is a specialized subfield where the micro-geometry of the tooth dictates efficiency. Techniques such as hobbing are used for production, or 5-axis milling for prototypes. Power Skiving has revolutionized this sector, making it possible to machine internal and external gears on the same turning machine, improving concentricity.

What to consider when choosing machining for a part

Choosing machining over other technologies such as injection molding or 3D printing depends on a balance between cost, quality and volume.

• Production volume: Machining is the superior option for low and medium runs (1 - 1,000 units) where the cost of casting molds cannot be amortized.

• Material and machinability: Not all metals cut the same way. Aluminum (6061, 7075) allows high speeds, while titanium or stainless steel require more rigid machines and advanced cooling strategies due to their hardness and low thermal conductivity.

• Tolerances: It is vital to apply tight tolerances only where they are functionally necessary. For the rest, the ISO 2768 standard offers an efficient benchmark that avoids unnecessary extra costs.

At Vurcon, we know that no two customers are alike. That is why our approach is based on tailored advice to study which configuration (lathe, machining center, 3 or 5 axes) best suits your specific machined part needs, always guaranteeing the best value for money on the market.

Do you have a part that is giving you trouble or whose costs have soared?

Send us the drawing and our engineers will propose an optimized machining strategy with no obligation. [Contact Vurcon for your personalized study].