AlternateRound and Spline Teeth
		A type of spline broach which assures concentricity of inside, outside and pitch diameters by alternating spline and round teeth in the finishing section, also called Dwell Teeth

Back Taper
		Practice of grinding the form on a broach with a taper from front to back with the back end being lower. This provides relief on the flanks of the cutting teeth. In most cases the form must be calculated to compensate for back taper, also called Back Clearance or Form Relief

Back–Off
An angle on top of the tooth to reduce the amount of broach surface in contact with the part, also called Tooth Relief and Tooth Clearance

Body Diameter
		The root diameter of a spline on an internal spline broach. It is always smaller than the minor diameter of the part to provide clearance

Broach
A multiple tooth linear travel cutting tool of bar or slab shape where each tooth takes out a predetermined amount of material.

Burnishing Broach
		A broach with smooth radius teeth without edges. Used to smooth a surface by compression

Burnishing Button
The "teeth" on a Burnishing Broach. Broach tooth without edge. A series of them are sometimes placed after the cutting teeth of a broach to produce a smooth surface.

Chip Breaker
		Notches in the teeth of broaches which break the chips, facilitating their removal. On round broaches they prevent the formation of a solid ring in the chip gullet, also called Chip Grooves, Notches, Nicks

Chip Gullet
see Chip Space

Chip Per Tooth
Depth of cut which determines chip thickness

Chip Space
		Space between broach teeth which carries chips during cut, also Chip Gullet

Chip Breaker Flats
Flat areas ground on teeth of round broach to act as chip breakers. Used near finish teeth to avoid streaking

Combination Broach
An internal broach which cuts two or more surfaces at one pass, such as a round and spline broach.

Double Jump Broach
Tool where the cutting teeth are stepped in pairs, usually at higher than normal increments. The first tooth takes out approximately half the width or circumference. The second half takes out the remainder. Commonly used when broaching cast surfaces where the goal is to get under the scale by using heavy cuts.

Dwell Teeth
see Alternate Round and Spline Teeth

External Broach
		A broach which cuts on the external surface of the work piece

Face Angle
Angle of the cutting edge of a broach tooth, also called Hook Angle or Rake Angle.

Finishing Broach
A broach which takes a light finishing cut

Finishing Teeth
Teeth at the end of broach arranged to take a light cut to finish the surface

Follower Diameter
That part of the broach which rests in the follower support bushing and may be used as a retriever on the return stroke

Front Pilot
		Section of broach used to guide part to first tooth

Gullet Radius
Curve of space between teeth. These are really two radii, the "face angle radius" just below the cutting edge, and the radius of the back of the preceding tooth called the "heel" radius

Helical Spline Broach
Broach which cuts a helical spline

Hexagonal Broach
Broach which cuts a hexagon shape hole

Holders–Broach Holder
That element affixed to the main holder which carries the broaches

Holders–Main Holder
That element affixed directly to the ram which carries the broach holder

Hook
Part of the tooth form. Varies with types of material being broached and, in some cases, is negative, also called Rake and Face Angle

Increased Land
A progressive and incremental increase in the amount of a tooth land that is not backed off. This technique allows a tooth to be sharpened more without a subsequent loss of tooth height.

Internal Broach
		Broach which is pulled or pushed through a hole in the work part to bring the hole to desired size and shape

Keyway Broach
Broach that cuts a keyway in the bore of a wheel, gear, etc.

Land
Width on the top of the tooth

Land, Straight
		A land having no back–off angle, used for finishing teeth to retain broach size after a series of sharpenings

Load Gall
A buildup of the material being cut on the broach. Usually caused by a dull broach, excessive land, insufficient clearance on the form, or weak (deficient) coolant

Machines–Continuous Broaching Machine
A high production machine in which the parts are carried through the machine on fixtures mounted on a chain conveyor moving past a series of stationary broaches. Alternately, parts remain stationary and broaches are moved across them. Parts are loaded by the operator at one end of the machine and drop out of the fixtures at the other end

Machines–Horizontal Broaching Machine
Broaching machine that moves the broach in a horizontal plane

Machines–Rotary Broaching Machine
A high production broaching machine in which broaches are mounted in broach holding columns at the periphery of the machine. The parts to be broached, clamped in fixtures, are carried on a rotary table past the broaches

Machines–Turret Broaching Machine
Multiple broaching machine with turret action

Machines–Vertical Broaching Machine
Broaching machine in which broaches move vertically, either up or down

Pitch
Measurement from the cutting edge of one tooth to the corresponding point on the next tooth, also called Tooth Spacing and Tooth Index

Progressive Surface Broach
Surface broach equipped with one or more sets of teeth narrower than the width of the surface to be broached. These are fanned out at an angle so that the entire width of the work piece is machined only by a complete pass of the broach

Pull Broach
		Broach that is pulled through or over the surface of the work piece

Pull End
That end of a broach at which the broach is coupled to the puller of the broaching machine

Pull Shank Length
The distance from the puller end of the broach to the first tooth

Puller, Automatic
		A device used for pulling a broach that automatically locks onto the pull end of the broach to pull the broach, also called Sleeve Type Puller

Puller, Hairpin Type
		A manually operated device used for pulling a broach. Used on small diameter pull shanks, also called Pin Type Puller, Notched Type Puller

Puller, Key Type
		A mechanically operated device used for pulling a broach. Usually used for low production jobs, also called Slot Type Puller

Puller, Notch Type
		Device used for pulling a broach on keyways and other flat internal surfaces

Push Broach
		Broach that is pushed through or over the surface of the work part

Rake Angle
see Hook

Rear Pilot
		Section of broach at rear to guide the part past the last tooth

Retriever
		An automatically operated device used to return a broach to starting position. Sometimes an automatic or notch type puller is used.

Rifling Broach
Broach for rifling gun barrels. Spiral type broach, usually with long pitch, to provide large chip space

Root Diameter
		The diameter at the bottom of the tooth gullet depth on a round or cylindrical broach

Rotor–Kut Broach
		Broach with cutting teeth designed so parallel segments of an internal surface are progressively cut from solid stock. Portions of the stock remain at each side of each cutting tooth. Final teeth are round.

Roughing Broach
A broach which is designed for the roughing operation. Must be followed by a finishing broach

Roughing Teeth
The teeth which take the first cuts in any broaching operation. Generally they take heavier cuts than succeeding teeth

Round Broach
Broach of circular section

Semi–Finishing Teeth
Broach teeth, just ahead of the finishing teeth, which take the semi–finishing cut

Shank Length
		Portion of broach in front of teeth. Includes pull end and front pilot.

Shear Angle
The angle between the cutting edge of a shear tooth and a line perpendicular to broach axis or line of travel

Shear Cutting Tooth
		Tooth positioned so it does not run perpendicular to the direction of broach motion. Most often on surface or external broaches. Cuts with a shear action with maximum tooth overlap

Slab Broach
Flat, slab shape surface broach

Spiral Broach
Broach with a continuous spiral shaped tooth gullet. Vibration is reduced because the cutting teeth are always engaged.

Spline Broach
Internal broach for cutting splines

Square Broach
An internal broach for cutting a square hole

Steady Rest Spots
		Cylindrical ground sections between teeth. Used to provide steady rests while grinding and sharpening

Step Per Tooth
		Progressive increase in tooth size from tooth to tooth of a broach. Usually greater in roughing teeth than in semi–finishing teeth. Action of step height produces the equivalent of feed in other types of machining.

Straight Land
The portion at the top of a broach tooth that is relieved or backed off

Streak
A mark on the finish of a part usually caused by chip breakers or moving of the part while broaching, see also Tearing

Strip Broach
A broach that is pushed through the part and then pulled or stripped back through in the opposite direction. Greatly reduces cycle times because the tool never needs to be hooked and unhooked from a puller. Applicable only where the length of the cutting section of the tool is relatively short in comparison to its diameter or cross–sectional area.

Tearing
A gouge or rip in the surface of the part usually caused by a dull broach, loading, insufficient chip room, insufficient clearance, weak (deficient) coolant, hydraulic oil in coolant, or insufficient heat, see also Streak

Tooth Form
		The shape of the cutting section of a broach, also called Tooth Shape and Tooth Profile

Tooth Radius
The radius at the tooth depth used to curl the chips, also called Root Radius and Gullet