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Chip Splitters – Notches in the circumference of a corn-cob style Endmill cutter resulting in narrow chips. Suitable for rough machining.

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Flute – Space between cutting teeth providing chip space and regrinding capabilities.  The number of cutting edges.  Sometimes referred to as “teeth” or “gullet”.  The number on an end mill will determine the feed rate.

Hook – A term used to refer to a concave condition of a tooth face. This term implies a curved surface rather than a straight surface.  Hook must be measured at the cutting edge, making measurement difficult.

Core Diameter – The diameter of a cylinder (or cone shape with tapered Endmills) tangent to the flutes at the deepest point.

Relief-Space – Provided by removing material immediately behind the cutting edge. Done to eliminate the possibility of heeling or rubbing.

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Chamfer – A short relieved flat installed where the periphery and face of a cutter meet. It is used to strengthen the otherwise weak corner.

Helix Angle – The angle formed by a line tangent to the helix and a plane through the axis of the cutter or the cutting edge angle which a helical cutting edge makes with a plane containing the axis of a cylindrical cutter.

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Gash width – The width of the gash feature. The space between cutting edges, which provides chip space and resharpening capabilities. Sometimes called the flute.

Gash (Notch) – The secondary cuts on a tool to provide chip space at corners and ends. The space forming the end cutting edge, which is used when feeding axially.

Recommended Cutting speed range for turning at stable conditions is 440 - 610 [SFM] / 135 - 185 [m/min]. Recommended Cutting speed range for milling with stable ...

Apr 28, 2016 — Most bare steel bits will be HSS, short for high-speed steel, a hard and durable alloy that is highly resistant to softening at high ...

Dish Angle – The angle formed by the end cutting edge and a plane perpendicular to the cutter axis. Dish ensures that a flat surface is produced by the cutter.

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By rubbing a metal workpiece against the rotating lap and its associated abrasive, the machinist produces microscopic fractures and indentations in the surface.

Entrance Angle – The angle formed by a line through the center of the cutter at 90 to the direction of feed and a radial line through the initial point of contact. As this angle approaches 90 degrees the shock loading is increased.

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Helical – A cutting edge or flute which progresses uniformly around a cylindrical surface in an axial direction. The normal helical direction is a right direction spiral.

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Differential pitch cutters – A specifically designed variation in the radial spacing of the cutter teeth. This provides a variation in tooth spacing and can be beneficial in reducing chatter. This concept is based on reducing the harmonic effect of the tool contacting the part in an exact moment of vibration.

Angular Edge – The cutting edge that is a straight line and forms an angle with the cutter axis. The cut that an Angular edge tool produces will not be as flat as a helical cutting edge.

Rake – The angular relationship between the tooth face or a tangent to the tooth face at a given point and a reference plane or line.  An angular feature ground onto the surface of an end mill.

Axial Runout – The difference between the highest and lowest indicator reading that is taken at the face of a cutter near the outer diameter.

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Cutting Edge – The leading edge of the cutter tooth.  The intersection of two finely finished surfaces, generally of an included angle of less than 90 degrees.

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Jun 4, 2024 — It is designed to remove material quickly from a workpiece's surface, producing a smooth and even finish. Characteristics of Face Mill. Cutting ...

Jan 26, 2020 — You may be able to find case hardened 4D (1 1/2") finish nails. They will go in the concrete but it will take accurate striking with the hammer.

Concave – Small hollow required on the end face of an Endmill. This feature is produced by a dish angle produced on the cutter.

19/32" Diameter 3 Flute 1-1/4" Cut 3-1/2" Length 5/8" Round Shank Single End Ball Nose Uncoated - 4322166 (Skookum End Mills). Uncoated (Brite) End Mill ...

Tangential rake angle – The angle made by a line tangent to a hooked tooth at the cutting edge & a radius passing through the same point in a plane normal to the axis.

Back taper – A slight taper resulting in the shank end of the cutting diameter being smaller than the cutting end. This condition aids not only the plunging or drilling condition but also tends to compensate for deflection.