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Broach Terminology
Alphabetical Index
[ A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z ] ABBack-off Angle - Relief angle back of the cutting edge of a broach
tooth.
Back-of-tooth Radius - The radius on the back of the tooth in the chip space. Broach - A metal cutting tool, bar or slab shaped, equipped with a series of cutting teeth. Burnishing Button - Broach tooth without a cutting edge. A series of buttons is sometimes placed after the cutting teeth of a broach to produce a smooth surface by material compression. CChipbreaker - Notches in the teeth of broaches which divide the
width of chips, facilitating their removal. On round broaches, they prevent
the formation of a solid ring in the chip gullet.
Chip per Tooth - The depth of cut which determines chip thickness. Chip Space - Space between broach teeth which accommodates chips during cut. Sometimes call the "chip gullet." It includes the face angle, face angle radius, and back-of-tooth radius. Cut per Tooth - Progressive increase in tooth height 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. Twice the chip per tooth for round broaches. DEExternal Broach - A broach which cuts on the external surface of
the work piece.
FFace Angle - Angle of the cutting edge of a broach tooth. Sometimes
called the "hook" angle.
Face Angle Radius - The radius just below the cutting edge that blends into the back of the tooth radius. Finishing Teeth - Teeth at the end of broach arranged at a constant size for finishing the surface. Front Pilot - The guiding portion of a broach (usually internal) which serves as a safety check to prevent overloading of the first roughing tooth. GGullet - Name sometimes applied to the "chip space."
HHook Angle - Name sometimes applied to the "face angle" of tooth.
IInternal Broach - Broach which is pulled or pushed through a hole
in the work piece to bring the hole to desired size and shape.
JKLLand - Thickness of the top of the broach tooth.
Land, Straight - A land having no back-off angle and used for finishing teeth to retain broach size after a series of sharpenings. Length to First Tooth - The sum of pilot and pull shank length. MNOOverall Length - Total length of a broach.
PPitch - Measurement from the cutting edge of one tooth to the corresponding
point on the next tooth.
Pull Broach - Broach that is pulled through or over the face of the work piece. Pull End - That end of the broach at which it is coupled to the puller of the broaching machine. Push Broach - A broach that is pushed through or over the surface of the workpiece. QRRoughing Teeth - The teeth which take the first cuts in any broaching
operation. Generally, they take heavier cuts than the semi-finishing teeth.
Round Broach - Broach of circular section. SSemi-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 which is the pull end. Shear Angle - The angle between the cutting edge of a shear tooth and a line perpendicular to the broach axis or line of travel on surface broaches. Shear Cutting Tooth - Tooth positioned so it does not make a right angle with the direction of broach motion. Used on surface or external broaches, and cuts with a shear action, with maximum tooth overlap. Surface Broach - An external broach which cuts a flat or contoured surface. TTooth Depth - Height of tooth or broach gullet from root to cutting
edge.
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