# What are the important angles on a lathe tool?

A cutting tool's construction includes three critical angles: rake angle, clearance angle, and plan approach angle. Rake angle is the angle formed at the cutting edge between the top face of the tool and the normal to the work surface. Clearance angle is the angle made by the bottom of the cutting tool with the work surface. Plan approach angle is the angle made by the front of the tool with respect to its line of action as it approaches the workpiece.

The angles affect how much material will be removed from the workpiece. For example, if there is not enough rake, then the cutting edge will wear prematurely. To avoid this problem, manufacturers provide various rake angles for their tools. The ideal rake angle depends on how the tool is used but generally falls in the range of 1-15 degrees.

Clearance angle determines how easily the tool can be pulled out of the workpiece. If it is too small, then the tool will break off inside the workpiece which is called a "kickout." On the other hand, if it is too large, then more material will be removed than intended which leads to poor quality parts or damage to the tool itself. Ideal clearance angles vary depending on what type of material you are cutting but usually fall in the range of 15-45 degrees.

The third critical angle is plan approach angle.

## What are the two angles called on a cutting iron?

A small rake angle is used to cut hard metals, whereas a wider rake angle is used to cut soft and ductile metals. 6.6° is a common rake angle for cutting tools.

The primary angle between the face of the tool and the cutting edge is called the rake angle. The secondary angle between the opposite side faces of the tool is called the clearance angle. For example, on a cutting wheel, the face that contacts the workpiece has a rake angle while the opposite face has a clearance angle.

Rake: The angle that the cutting edge makes with the surface of the tool. A tool with no rake angle will cut across its surface. A tool with a large rake angle will cut deeper into the material being removed.

Clearance: The angle that the two sides of the cutting element make with one another. Clearance angles vary depending on the type of tool. Flat tools have zero clearance angle. End mills have larger clearance angles than flat tools because they include a corner where two edges meet. Picking tools have very small clearance angles because they are designed to cut into an existing hole or recess rather than slice away from the material. They are used when you want to clean up a rough-looking surface by making very small cuts.

## What is the tool's flank face?

Excess material is removed from the work surface using a wedge-shaped, sharp-edged cutting tool in traditional machining. As a result, the flank surface is one of the tool point surfaces that, when intersected with the rake surface, generates a cutting edge. The other two tool corner surfaces are the end mill and the tip, respectively.

The flank faces of tools cut by this method have smooth, flat surfaces without any chamfers or other design features to enhance their cutting ability. However, they may be hand finished after fabrication to remove any rough spots created during the manufacturing process.

Flank cutting is commonly used for shaping hard materials such as wood, metal, and ceramic. It can also be employed to create intricate details in soft materials such as leather and foam rubber. The main advantage of this technique over other cutting methods is its ability to produce a very smooth cut with no visible joints.

There are two types of flank cutting: open end and closed end. In open-end cutting, the material being cut away forms a continuous stream that leaves the tool with no final stop. This type of cutting is suitable for producing large volumes of uniform pieces from hard materials. Closed-end cutting, on the other hand, stops the flow of material being cut away once a desired amount has been removed. This allows users to obtain a specific size and shape from each piece.

## What is a negative rake lathe tool?

The form of the carbide's cutting angle is referred to as negative rake. The cutting tool, in essence, slopes away from the cutting edge at an appropriate angle. Negative rake cutters are designed to be far less aggressive than regular cutters, resulting in safer, smoother, and more continuous cuts in those extremely hard materials. They are also useful for cutting deep holes because they allow you to take off more material than would be possible with a standard cutter.

Negative rake tools can be hand-held or mounted on a machine. Hand-held negative rake tools are most easily used for fine work such as carving wood sculpture. Machine-mounted tools are required when you want to do extensive cutting with negative rake equipment.

Hand-powered negative rake machines were popular about 100 years ago. At that time, car manufacturers needed hemispherical caps for their cars. These caps were made of steel or aluminum, and it was difficult to achieve a smooth finish with the then available machinery. So engineers came up with the idea of using negative rake tools, which allowed them to get a smooth finish on these components. Nowadays, negative rake machines are used mainly for sharpening other tools.

### Why do we need negative rake tools?

People have been making use of natural resources for many purposes. One of the most important applications of mining technology is manufacturing of various types of tools. Tools are used in industries to manufacture products.

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