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| Slot drills (top row in image) are generally two (occasionally three) fluted cutters that are designed to cut on their end as well as the flutes. They are so named for their use in cutting keyway slots. When used for plunge cutting (vertically down as when drilling), one of their frontal cutting edges should be across the center for the correct cutting action to occur as shown in the image opposite, with the end view of the slot drill. Slot drills are mostly used only when it would be too time consuming to pre-drill a hole for an endmill and there isn't enough room for the end mill to plunge using a helical motion. That is because slot drills don't drill very well; the cutting edge that crosses the center of the mill (center-cut) actually spins the wrong way on the part of it that crosses the center. |
End mills
End mills (middle row in image) are generally high speed steel(HSS) cutting tools with two or more flutes. They are the most common tool used in a vertical mill.
Two flute end mills can be used for plunge cutting. They are also called center cutting because they can start their own hole.
Three flute end mills are a good choice for slotting and provide an acceptable surface finish. Two teeth are in the cut most of the time, reducing chatter.
Four flute end mills only cut on their periphery and can plunge cut when a starting hole is pre-drilled or if instead of simply drilling down into the workpiece, perform a three-axis helical motion. They are generally stronger than a two or three flute end mill, therefore allowing for increased feed rates.
Roughing end mills are used to quickly remove large amounts of material. This kind of end mill utilizes a wavy tooth form cut on the periphery. These wavy teeth form many successive cutting edges producing many small chips, resulting in a relatively smooth surface finish. During cutting, multiple teeth are in contact with the workpiece reducing chatter and vibration.
Early milling_Cutters.php">endmills and most large endmills have a recessed center at each end of the cutter to facilitate resharpening, this results in the full cutting edge being unavailable. The image at right shows two end views (center row) of an endmill that illustrate this. Some endmills also have rounded corners, either concave radii (fillet endmills), or convex radii (bullnose).
Ball nose cutter
Ball nose cutters (lower row in image) are similar to slot drills but the end of the cutters are shaped as hemispherical cutting edges. They are ideal for machining 3 dimensional contoured shapes in machining centres, for example in molds and dies.
Shell mill
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Shell mills are used either by themselves or in milling" href="/w/index.php?title=Gang_milling&action=edit">gang milling operations on manual horizontal or universal milling machines to machine large broad surfaces quickly. They have been superseded by the use of Carbide tipped face mills that are then used in vertical mills or machining centres.
Side and face cutter
The side and face cutter is designed with cutting teeth on its side as well as its circumference. They are made in varying diameters and widths depending on the application. The teeth on the side allow the cutter to make unbalanced cuts (cutting on one side only) without deflecting the cutter as would happen with a slitting saw or slot cutter (no side teeth).Involute gear cutter
The image shows a Number 4 cutter from an involute gear cutting set. There are 7 cutters (excluding the rare half sizes) that will cut gears from 12 teeth through to a rack (infinite diameter). The cutter shown has markings that show it is a
- 10 DP (diametrical pitch) cutter
- That it is No. 4 in the set
- that it cuts gears from 26 through to 34 teeth
- It has a 14.5 degree pressure angle
Hobbing cutter
These cutters are a type of form tool and are used in hobbing machines to generate gears. A cross section of the cutters tooth will generate the required shape on the workpiece, once set to the appropriate conditions (blank size). A hobbing machine is a specialised milling machine.
Face mill (carbide tipped)
A face mill consists of a cutter body (with the appropriate machine taper) that is designed to hold multiple disposable carbide or ceramic tips or inserts.
These tips may be rotated within the holder to present a fresh face to the workpiece, this increases the life of the tip and thus their economical cutting life. The tips are not designed to be resharpened and are selected from a range of types that may be determined by various criteria, some of which may be: tip shape, cutting action required, material being cut.
Woodruff cutter
'Woodruff cutters are used to make the seat for woodruff keys. These keys are used to retain pulleys on shafts and are shaped as shown in the image.
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