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Machining techniques, milling and turning

Milling and turning are commonly used for machining mechanical parts, mechanical assemblies and sub-assemblies as well as wear and safety parts. These complementary processes participate in the production of high precision mechanical parts in a wide variety of industries: energy, food processing, aeronautics, etc.

The difference between milling and turning

Milling and turning are two similar and complementary machining techniques. They allow you to trim material on a part in order to give it the desired shape. These techniques are used to shape all types of hollow shapes such as a cylindrical hole or a groove in a mechanical part for example, but also to obtain solid cylinders. The difference between milling and turning is in the movements made by the machine tool.

Milling is carried out using a milling cutter mounted on the milling machine. This machine makes it possible both to remove material and to advance the part as the trimming progresses. To increase productivity and precision, most machining centers now use CNC milling machines.

Milling combines two movements: the cutting rotation of a tool with several edges and the rectilinear feed of a part known as the feed movement. However, it is customary to move the tool relative to the workpiece, which can be done in virtually any direction.

Generally, milling is used to obtain flat surfaces, shoulders and grooves. It can be performed on a wide range of machine tools, from classic milling machines to the new generation CNC (Computerized Numerical Control) machines developed with multiple axes.

The choice of milling tool and the type of operation will depend on the part drawing and production requirements. The advantages of milling are multiple: in addition to its high performance, it allows an excellent surface finish, great precision and increased flexibility in its shapes.


Turning is carried out with a single rotary movement. Unlike milling, it does not advance the part. The latter is immobilized in a mandrel or by a clamp. The cutting tool can trim the inside and outside of the workpiece with a precise feed motion. Besides shaping cylindrical shapes, this technique is mainly used for turning screws, bolts and other fasteners.

Smepi, the milling and turning expert

When it comes to milling and turning of mechanical parts, it is recommended to contact a professional whose know-how is recognized. Indeed, trimming a part requires the greatest precision. The slightest error could alter the assembly or the performance of a mechanical assembly.

Specialist in precision industrial mechanics since 2001, SMEPI is ideal for manufacturing all wear and safety parts for mechanics. From fasteners to masterpieces, this precision machining expert can meet all requirements, regardless of the material to be worked (stainless steels, bronze, alloys, aluminum, Inconel, Monel, etc. Calling on this expert, be sure of the quality of the milling and turning of your parts.

To meet the expectations of its customers at all points, SMEPI offers a complete service including support in the design of the part to be manufactured, prototyping to give you an overview of the rendering and assess its quality, privileged access to stocks of materials. group premieres. This allows it to stand out from its competitors in terms of production time.

SMEPI can meet your demand, whether you need to produce small or large series of parts. In addition, it is also possible to entrust him with the assembly of the mechanics. This machining specialist also masters the surface and heat treatments essential to ensure the durability of your parts according to their constraints and the environment of use. Nickel plating, zinc plating, nitriding… SMEPI can do it all.

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