Milling Angle Basics
Measuring the angle of a milling tool is an important step in the milling process. Knowing the angle of the cutting tool enables you to accurately and precisely control the depth and direction of the cut. In milling applications, angles are specified to identify the cutting tool, indicate what type and size of tool can be used and define the finish desired on the machined surfaces. In this article, we will discuss the basics of milling angles and how they are used in everyday machining operations.
Angles play a critical role in milling applications. They define the parameters of the tool, enabling the machinist to make consistent, accurate and repeatable cuts. Many angles may be used in milling applications, but the most commonly used angles are the lead angle, rake angle and clearance angle.
Lead angle is defined as the angle between the cutting direction and a line parallel to the flank of the cutting edge. Lead angle is important for chip formation and cutting forces, as the angle of the rake affects chip shape and the amount of power required for the cutting operation. Generally, lead angles are between 5* and 30*.
Rake angle is the angle between the face of the cutting edge and a line perpendicular to the flank of the cutting edge. Rake angle determines the amount of space put between the cutting edge and the machined surface. Rake angles, which are generally positive, can range from +0* to +45*.
The clearance angle is the angle between the flank of the cutting edge and a line perpendicular to the cutting direction. The clearance angle defines the amount of space between the cutting edge of the tool and the point of entry into the workpiece. This angle typically has a negative value, ranging from -10* to -35*.
These angles are critical to milling, as they play an important role in the cutting process. When setting up a milling machine, it is imperative to have the right angles to ensure the cut is deep enough and the finished product is of the highest quality.
When selecting a cutting tool, it is important to have an understanding of the lead angle, rake angle and clearance angle. Knowing these angles helps with determining the right tool and parameters to achieve the desired finish and control the cutting process.
Its also important to know that in most cases, all three angles can be modified on the tool. This helps improve the overall cutting performance and allows for the greatest flexibility when machining different materials.
Milling angle basics are an essential part of machining operations and should be understood before starting a milling project. Knowing the angles for lead, rake and clearance enables you to choose the right tool and ensure a successful cut every time.
