What is Broaching?

Broaching is a machining process that pushes or pulls a cutting tool (called a broach) over or through the surface being machined. Broaches are referred to as multiple-point linear-travel cutting tools and are used to produce flat, circular, and even extremely intricate profiles, as seen from a section perpendicular to the tool travel. A broach is a series of single-point tools arranged successively in the axial direction along a tool body or holder. Each sequential tooth varies in size and shape in a manner that allows each tooth to cut a chip of the proper thickness.
The shape and spacing of each broach tooth is determined by the length of the part being broached, the amount of material being removed by each tooth, and tonnage restrictions of the broaching machine. The chip space between each tooth is designed to sufficiently accommodate the volume of chips generated.
Various broaching examples
The concept of broaching as a legitimate machining process can be traced back to the early 1850s. Early broaching applications were cutting keyways in pulleys and gears. After World War 1, broaching contributed to the rifling of gun barrels. Advances in broaching machines and form grinding during the 1920s and 30s enabled tolerances to be tightened and broaching costs to become competitive with other machining processes. Today, almost every conceivable type of form and material can be broached.
Straddle broaching examples Slot broaching examples Internal broaching examples
Straddle Broaching Slot Broaching Internal Broaching

These are a few examples of typical straddle broach operations. These cuts are achieved by using opposing straddle broaches and simple hydraulic clamping. Most straddle squares and hexes can be completed in a single broach pass with the use of an automatic indexer, collet and anvil part support. Some examples of typical single and multiple pass slot broaching, achieved by using standard / interchangeable tooling. To accommodate various part sizes and shapes, the fixtures can be used with an almost unlimited range of work holding jaws, adaptors, and locator nests, either made in your own tool room, or furnished by Ty Miles. Here are some examples of parts that were   internally broached to produce internal involutes, irregular shapes or most any hole configuration you can imagine. This can be done on a multi station machine, completing up to 3 or 4 parts per machine cycle.
Some of our Customers Include: Some Industries Include:
Harley-Davidson
G.E. Aircraft Engines
The Torrington Company
General Motors Corp.
Ford Motor Company
Daimler Chrysler
Beretta USA Corp.
Whirlpool Corporation
Schlage Locks
Black and Decker
Caterpillar
TRW
Eaton Corp.
Ingersoll Rand
Kohler Co.
Briggs and Stratton
Delphi Automotive Systems
Baxter Healthcare
* Aerospace
* Automotive
* Appliance
* Firearms
* Locks
* Defense
* Medical
Customers from many diverse industries decidedly choose the broaching advantage for the superior quality that broaching can achieve, while saving time and money. See our sample of industries that have benefited from Miles Broaching technology.
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