Wed, 22 February 2012 17:07:21 EST

Type	Description	Photo
Surface	Surface broaching tools are used to provide precision size and controlled finish to the outer surfaces of a variety of parts. Usually the part is held in a stationary work holding fixture and the tool, or assembly of tools, are mounted into a tool-holder that in turn is mounted to a moving slide whereby the tool[s] can be passed over the part in a controlled manner. Sometimes the process is reversed whereby the part moves and the tool[s] are stationary.
Pot	Pot broaching tools are arranged in a hollow tool-holder to surround a part, such as a gear, and either the part is pushed through the tool-assembly or the tool-assembly is passed over the part to simultaneously cut all of the external surfaces. Pot broaching tool assemblies may consist of individual form broach inserts [commonly called "sticks"], a series of ring broaches, or a combination of both tools where the "stick" broach tools rough the part-profile followed by a series of full form shaving ring tools.
Round	The very simplest of broach tools, used to precision size and finish an existing internal round hole.
Spline	Splined holes, usually required in parts that mount upon a shaft or hub having a mating profile, are produced by pushing or pulling a broach tool through a part having a starting hole produced by other means. Splined tools are most commonly used to produce involute profiles but can also generate straight, angular, or special spline profiles such as cycloidal. Spline broaches can be used to generate a full compliment of teeth or a partial compliment of teeth [such as a blocked or missing tooth].
Serrations	A spline broach used to generate fine pitch splines called serrations.
Combination Round And Spline	These tools have a series of round teeth followed by a series of spline teeth and are used to combine sizing of the spline minor diameter prior to cutting the spline in one machining operation.
Combination round and spline with dwell teeth	This is a combination round and spline tool having a series of alternate finishing teeth [a round followed by a spline, followed by a round, etc..] to size the spline minor diameter concentric to a specific spline attribute such as the pitch diameter or major diameter. These tools most often have a series of round teeth at the starting end that leave sufficient stock for the dwell tooth section to clean-up; sometimes the starting hole is controlled close enough to eliminate the need for the front round teeth. These tools are most always chosen when a subsequent machining operation is required to be held in relationship to certain spline attributes and provide positioning of the part from the spline minor diameter instead of the required attribute for the subsequent operation thereby saving money and time.
Internal profile Hex Square Polygon	These tools operate in a manner similar to spline tools and are used to produce profiles such as square, hex, oval, polygon, and special contours. The starting hole may be round whereby the complete non-round profile is generated from a conventionally produced round hole or from a profiled hole that minimizes the material to be removed by broaching.
Roto-Kut	Roto-Kut tools are conventional round or spline tools having a beginning section of teeth comprised of a series of groups of teeth, each group comprised of teeth having the same diameter with a series of tip cutting sections, each tooth in the group is rotated in a manner to remove equal portions of material. They are used primarily to get under scale in cast or forged holes but also to produce straight cuts in untrue holes such as exists when holes have been drilled from each end of the part and some mismatch exists.
Burnishing	Burnishing tools have a series of teeth that have been crowned in a radial fashion to produce a "ballizing" effect in a round hole [rarely but occasionally they are used for special profiles) These tools do not remove material, they compact it by each tooth being slightly larger than the proceeding tooth to produce a burnished [smooth] surface.
Bearing Cage	Bearing cage broaches are special internal profile broaches used to size the pockets of bearing cages. Two opposing surfaces or all four sides of rectangular holes are finished in each of two holes in line on opposite sides of a bearing cage ring. Circle broach is the industry leader in designing and manufacturing of these highly specialized tools.	Insert Bearing Cage Photo Here
Keyway	Keyway broaches per se are rectangular broach tools having a precision body that guides in a special work positioning and supporting fixture upon which a part can be placed. The tool is usually pulled, sometimes pushed, through the part to cut a single keyway.
Round Body Keyway	Round body keyways are pull or push broaches having a round body to guide in the part bore and a series of flat gullet teeth on one side that cut [generate] an internal keyway. Quite often, the round body keyway section is proceeded by a round finishing section so precision size the part bore.