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What is a Broach and How Does it Work in CNC Machining


When it comes to CNC machining, engineers and designers are often tasked with creating intricate and detailed parts for various industries. One tool that is essential for achieving precision and accuracy in these parts is the broach.

If you’re new to the world of precision CNC turning machining or are simply interested in learning more about machining tools, you may have come across the term “broach.” But what exactly is a broach, and how does it work within CNC machining?

In this article, we will discuss the basics of broaching and its use in CNC machining. From its history to its application, we will cover everything you need to know about the broaching process.

What is a Broach and How Does it Work in CNC Machining

What is a Broach?

In simple terms, a broach is a machining tool that is used to cut shapes or profiles into a workpiece. Broaches are typically used for high-precision machining projects where a high degree of accuracy is required, such as in the manufacture of gears, splines, and other complex components.

The main advantage of using a broach in CNC machining is its ability to create highly precise shapes and profiles with less effort than other cutting tools. This is because a broach is a multi-toothed cutting tool that can create all of the shapes in a single pass, unlike other tools that require multiple passes to achieve the desired result. This makes broaching a faster, more efficient, and more economical option for many machining projects.

The history of broaching dates back to the 1850s when the first broach was invented by a blacksmith named Jesse Ramsden. Since then, the method has evolved and has become a crucial aspect in manufacturing.

Types of Broaches

Broaches come in different types, each designed for a specific application. Some common types of broaches include:

  1. External: This broach is designed to remove material from the outside of the workpiece.
  2. Internal: This broach is used to remove material from the inside of the workpiece.
  3. Keyway: This broach is designed to cut a keyway on the surface of the workpiece.
  4. Involute: This broach creates gear teeth on the surface of the workpiece.

How Does a Broach Work in CNC Machining?

A broach works by using a series of teeth that progressively increase in size as they move along the broach. The teeth engage the material being cut, and it creates the desired shape or keyway in the material.

During the machining process, the material being cut is held stationary, and the broach is moved back and forth over the workpiece. A broaching machine is typically used to move the broach, and it provides the necessary force to cut the material.

In CNC machining, broaches are typically used to create internal shapes or forms. The broach is mounted on a spindle and rotated at high speed. As the broach rotates, it is slowly fed into the workpiece. The teeth on the broach remove small amounts of material from the workpiece with each pass, creating the desired shape or form.

The broaching process involves slowly pushing the broach tool through the workpiece, removing material gradually until the desired shape is achieved. This process can be performed both manually and using CNC machines. The CNC machine enables more precise movement, resulting in excellent surface finishes, and consistency across workpieces.

By taking advantage of more sophisticated programming, CNC machines can use multiple-sided broaches that can create a whole range of shapes and sizes. The broaching process can be accomplished using three different styles of broaching: pull, push, and surface broaching.

Push broaching – The workpiece is set up against a fixed end stop, while the broach tool is pushed through the workpiece. The most straightforward style of broaching is ideal for producing keyways, round surfaces with varying radii, holes, and notches.

Pull broaching – The workpiece is held stationary, while the broach is pulled through the workpiece by a pulling device. This type of broaching is used to produce slots with shoulders, spirals like worm gear teeth, and blind holes.

Surface broaching – The broaching tool machines the surface of a workpiece by removing material until the desired surface is complete.

The broaching process is highly precise and can produce complex internal shapes that would be difficult or impossible to create with other machining methods. However, it does require a significant amount of skill and expertise to operate the machinery effectively.

How Does a Broach Work in CNC Machining

The Benefits of Using a Broach in CNC Machining

There are several benefits to using a broach in CNC machining, including:

  1. Increased Accuracy – The broach allows for precise cuts that are difficult to achieve with other cutting methods.
  2. Time and Cost Savings – With the use of a broach, many parts can be machined more quickly and for a lower cost than other methods.
  3. Reduced Waste – Due to the accuracy of the tool, there is less material waste, resulting in a more sustainable and cost-effective manufacturing process.

At Longsheng Technology, we specialize in CNC machining and provide precision CNC milling machining services. Our team of professionals understands the importance of utilizing the right tools and techniques to achieve the best possible outcome. Contact us today to learn more about our services and how we can help you with your manufacturing needs.

Why Use Broaching in CNC Machining?

Broaching is used in CNC machining because it is an efficient and cost-effective way to remove material from a workpiece. It is especially useful when working with hard materials, such as stainless steel or titanium, that are difficult to cut using traditional machining methods.

In addition to its efficiency, broaching also allows for highly precise cuts to be made in the workpiece. This makes it a popular choice for industries that require high levels of accuracy, such as aerospace and automotive.

Why is a broach important in CNC machining?

A broach is critical in CNC machining due to its ability to create precise and complex shapes on a workpiece. It is used to create internal features, such as keyways, splines, and broached holes, which cannot be milled using conventional milling tools.

Moreover, broaching is not limited to internal features, and they can also be used to cut external features such as splines, gears, and slots. In addition to its application in CNC machining, a broach is also used in other industries, such as automotive, aerospace, and medical.

The Significance of Broaches in CNC Machining

Broaches are an essential tool in CNC machining because they allow for the creation of precise internal shapes and forms. This is especially important in industries such as aerospace, medical devices, and automotive, where the precision of the final product is critical. Broaching is also useful in reducing the time required for multiple passes to produce a specific shape.

Broaches are an essential tool in CNC machining. They allow for the creation of precise internal shapes and forms that would be difficult or impossible to achieve with other machining methods. As a CNC machining manufacturer, we have years of experience in precision CNC turning machining and understand the importance of using the right tools in the machining process. Contact us today to learn more about our services and how we can help you with your CNC machining needs.

The Significance of Broaches in CNC Machining

Choosing the Right Broach for the Job

Choosing the right broach for a specific CNC machining job is essential to achieving the desired results. Considerations will include the type of material being cut, the dimensions and tolerances required, the complexity of the shape being cut, and the desired surface finish. Expertise in broach selection and machining is critical to achieving the desired results.

In conclusion, broaches are an essential tool in CNC machining, used for precision cutting, shaping, and finishing internal surfaces. Understanding the different types of broaches and their uses will help you choose the right tool for your specific machining job. Partnering with an experienced CNC machining manufacturer who specializes in precision CNC turning machining and broaching can help ensure the highest quality parts are produced using these essential tools.


At [Longsheng Technology CNC Machining Manufacturer], we understand the critical role that broaching plays in precision CNC turning machining, and we are committed to providing our clients with the highest quality broaching solutions for their projects. Our team of expert engineers and machinists has years of experience in broaching, and we pride ourselves on delivering superior results for each and every project we undertake.

So if you’re looking for a reliable, professional CNC machining manufacturer who can help you achieve your machining goals, look no further than Longsheng Technology. Contact us today to learn more about our broaching capabilities and how we can assist with your next project.


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