The broach tool design diagram below shows the general geometry of a hole broach. Note that “P” represents the pitch, “nr” is the number of roughing teeth, “ns” is the number of semi-finishing teeth, and “nf” is the number of finishing teeth.

The broach tool design includes three sections: roughing, semi-finishing and finishing. The broach combines three levels of cutting with one tool. Unlike typical machining processes, broaching completes multiple machining steps in quick succession. This makes broaching an efficient and popular option, especially for higher volume production machining.

Broach tools can machine a variety of hard and soft materials, depending on the design and tool type. The broaching process is similar to reaming, shaping, milling and boring, and is considered a superior option for high-volume production applications.

A high quality broach tool is critical to successful broaching results. EST makes broach tools of the highest quality and precision, so contact EST today for your broach tool quote.

Diagram from Degarmo, E. Paul; Black, J T.; Kohser, Ronald A. (2003), Materials and Processes in Manufacturing (9th ed.), p. 637. For additional information and source references, see https://en.wikipedia.org/wiki/Broaching_(metalworking)

What is Broaching?

Broaching is a machining process that uses a toothed tool, called a broach, to remove material from a workpiece. There are two main types of broaching: linear and rotary. In linear broaching, which is the more common process, the broach is run directly against a surface of the workpiece to achieve the cut. Linear broaches are used in a broaching machine. Most broaching machines are hydraulic and can be a horizontal or vertical motion. Vertical machines are more popular, comprising approximately 90% of all broach machine purchases. In rotary broaching, the broach is rotated and pressed into the workpiece to cut an axisymmetric shape. A rotary broach is used in a lathe or screw machine.

Broaching is used when precision machining is required. Different types of broach tools can produce results including circular or non-circular holes, splines, keyways and more. Broaching is a specialized manufacturing process praised for its speed and uniformity; it is a highly effective process when used for high volume production runs. Purchasing broach tools from Ever Sharp Tools ensures tools of highest quality and best material. When combined with our experience in maintaining and sharpening our tools, the end result is longer tool life and lower cost per part. Contact EST today for a quote on your broach tooling needs!

What are the different types of Broach Tools?

A broach tool (usually called, simply, a broach) is similarly shaped to a long drill bit or saw, except the height of the teeth increases over the length of the tool. The desired outcome of the broaching process determines the type of broach that will be used to accomplish the task. The most common types of broaches are included in the following drawing:

Square – Round – Single Keyway – Double Keyway – Spline – Hexagon

Rectangular – Double Cut – Internal Gear – Round – Helical Groove

By Franklin Day Jones, Douglas Thomas Hamilton, Chester L. Lucas – Broaching, page 10, Public Domain, https://commons.wikimedia.org/w/index.php?curid=10587661