Machining

Machines make parts by cutting.

They take a large piece of material. Then they cut away bits of it. This makes a new shape.

They can cut metal. They can also cut wood or plastic.

Some machines use a sharp tool. The tool is harder than the part. This helps it cut well. The tool moves against the part. This can make circles or straight lines.

People who do this are called machinists. They often work in a machine shop.

Many machines use computers now. The computers help them move. This makes the parts very well.

Cutting can happen in many ways. Some machines use a spinning blade. Others use a fast stream of water. Some even use electricity to cut.

Machining helps us build many things. It is a very useful way to make parts.

Machining is a way to make parts by cutting.

It is a type of subtractive manufacturing. This means you start with a large piece of material. Then, you remove parts of it to find a new shape. Most people use metal for this. But you can also machine wood, plastic, or ceramic.

A person who does this work is called a machinist. They often work in a machine shop. Many modern machines use computer numerical control, or CNC. This means computers control how the machines move.

Traditional machining uses sharp tools. The tool must be harder than the material it cuts. Some tools have one sharp edge. Others have many edges and they spin. You can make circular shapes by turning the part. You can also make straight shapes by milling.

There are also new ways to cut. Waterjet cutting uses a fast stream of water. Electrical discharge machining, or EDM, uses electricity to melt the material. This helps make very tiny or complex shapes.

Machining is a way to make parts by cutting away material.

This is called subtractive manufacturing. It is the opposite of additive manufacturing, like 3D printing, which adds material to build a shape. In machining, you start with a large piece of raw material. You then remove parts of it to create the shape you want. Most people use metal for this work. However, you can also machine wood, plastic, ceramic, and composites.

How does it work? It all starts with a cutting tool. This tool must be made of a harder material than the part you are making. The tool has sharp edges that separate small pieces, called chips, from the main work. Some tools have only one cutting edge, which is used for tasks like turning or planing.

Other tools have many cutting edges and usually spin to do their job. To make a shape, the tool or the workpiece must move against each other. This movement can be circular or in a straight line.

The history of this work has changed a lot over time. In the 18th century, a machinist was a person who built or fixed machines by hand. They used tools to carve wood or file metal. Famous builders like James Watt or John Wilkinson fit this description. During the Machine Age, people used traditional methods like drilling, sawing, and milling.

After World War II, new technologies like electrical discharge machining were created. This helped separate the old ways from the new ways.

There are many different ways to machine a part. Turning uses a lathe to spin a workpiece against a tool to make circular shapes.

Milling uses a spinning tool to make various straight shapes. You can also use a drill press to make holes. Some machines use a fast stream of water mixed with garnet to cut through things. This is called waterjet cutting.

Another way is electrical discharge machining, or EDM. This uses electric current to vaporize material. It is great for making very tiny and complex shapes.

You can see machining in many things you know. A machinist might work in a machine shop to make parts for a business.

Many modern shops use computer numerical control, or CNC. This means a computer controls how the machines move. This technology helps make parts very accurately. From small bolts to huge airplane parts, machining helps build our world.

Machining is a fundamental manufacturing process used to create specific shapes or parts. It works through the controlled removal of material from a larger, raw piece. This method is known as subtractive manufacturing. It stands in contrast to additive manufacturing, such as 3D printing, which builds objects by adding material layer by layer. While metal is the most common material used, machining can also be applied to wood, plastic, ceramic, and composites.

The core mechanism of machining involves a cutting tool interacting with a workpiece, often called the "work." To remove material, there must be relative motion between the tool and the work. This motion can happen in several ways, such as lateral rotary motion or linear movement. The specific shape of the tool, how it penetrates the work, and the type of motion used all determine the final geometry of the surface.

A cutting tool must be made of a material harder than the workpiece. The tool features sharp edges that separate small fragments of material, known as chips, from the parent work. These tools have specific geometries, including a rake face and a flank. The rake face directs the flow of the newly formed chips at a specific rake angle. The flank provides a relief angle, which creates clearance between the tool and the new surface. This clearance prevents abrasion that would otherwise degrade the surface finish.

Machining operations are generally divided into traditional and non-traditional categories. Traditional operations are further split by the shapes they create. Circular machining includes processes like turning, boring, drilling, reaming, and threading. These often use a lathe to rotate the workpiece against a tool. Other circular tasks include making threads, which are helical shapes used to fasten objects like nuts and bolts.

Various and straight shapes are created through different traditional methods. Milling involves a spinning tool with cutting edges on its cylindrical face. Sawing uses a toothed blade to cut a "kerf," or thickness, through material. Broaching uses a multi-toothed tool to cut specific shapes like squares or hexagons. Shaping uses a non-rotating tool that strokes back and forth to cut flat geometries. Grinding uses fast-moving abrasive materials, such as diamond or aluminum oxide, to wear away the surface.

Non-traditional machining uses different methods to remove material without simple mechanical cutting. For example, electrical discharge machining (EDM) uses an electrically charged metal rod or wire to vaporize material. This allows for very intricate shapes and a very small kerf. Waterjet cutting uses a high-pressure jet of water, sometimes mixed with an abrasive like garnet, to cut through thickness. Other advanced methods include plasma beam machining, electrochemical machining, and ultrasonic machining.

The history of machining shows how technology has transformed the field. In the 18th century, a "machinist" was a person who built or repaired machines by hand. These individuals, including figures like James Watt or John Wilkinson, used manual processes like hand-filing metal. The term "machine tool" did not even exist then. By the middle of the 20th century, the term "machining" became common as specific processes like milling and drilling became widespread.

Today, much of this work is performed using computer numerical control, or CNC. In CNC machining, computers control the precise movement and operation of machines like mills and lathes. This technology is vital in professional machine shops, which can be standalone businesses or internal departments within larger companies. From manufacturing aircraft parts to creating simple manhole covers, machining remains a cornerstone of modern industry.