2. Dividing head Vertical head Rotary table Slotting attachment Rack milling attachment UNIVERSAL SPIRAL ATTACHMENT HIGHSPEED ATTACHMENT DIFFERENT FLANKING DEVICE AND ATTACHMENT
3. Dividing head or indexing head is a special work holding device, which is bolted on the machine table. The work may be mounted on a chuck fitted on the dividing head spindle or may e supported between a live and dead center. The dead center is mounted on a foot stock as in a lathe tail stock that is bolted on the machine table after correctly aligning its spindle axis with the dividing head spindle. Dividing Head
4. The attachment is principally used for dividing the periphery f a work piece in equal number of divisions for machining equally spaced slots, or groves. The worm and worm gear driving mechanism of the attachment can be linked with the table lead screw for cutting equally spaced helical grooves on the periphery of a cylindrical work piece Dividing Head
8. It’s used for profile milling and many other circular operations in horizontal plane such as slotting and dovetailing. It’s consists a base, a worm drive mechanism and a small circular work table. Rotary Table
10. It’s used for cutting at any angle in vertical plane to produce key ways , slots and corners. It’s provide reciprocating drive for single point cutting tool. Slotting Attachment
12. It’s mounted between the face of column and outer support on a plain or universal milling machine. It consists a fixed housing and a spindle. A special rack indexing attachment used to move the work longitudinally with accurate spacing of teeth. Rack Milling Attachment
14. It’s used to mill spirals with a plain milling machine. It’s useful for cutting helical threads , gears , worms and racks. UNIVERSAL SPIRAL ATTACHMENT
16. It is used to drive small milling cutters at high speed. It may be fitted on vertical or horizontal machine. It consists a housing contains step-up gearing and a small spindle. HIGH SPEED ATTACHMENT
19. Milling cutters are usually made of high-speed steel and are available in a great variety of shapes and sizes for various purposes. You should know the names of the most common classifications of cutters, their uses, and, in a general way, the sizes best suited to the work at hand. Classification of Milling Cutters
20. Consider the following when choosing milling cutters: High-speed steel, stellite, and cemented carbide cutters have a distinct advantage of being capable of rapid production when used on a machine that can reach the proper speed. 45° angular cuts may either be made with a 45° single-angle milling cutter while the workpiece is held in a swivel vise, or with an end milling cutter while the workpiece is set at the required angle in a universal vise. Selection of Milling Cutters
21. The harder the material, the greater will be the heat that is generated in cutting. Cutters should be selected for their heat-resisting properties. Use a coarse-tooth milling cutter for roughing cuts and a finer-toothed milling cutter for light cuts and finishing operations. When milling stock to length, the choice of using a pair of side milling cutters to straddle the workpiece, a single-side milling cutter, or an end milling cutter will depend upon the number of pieces to be cut. Selection of Milling Cutters
22. Some operations can be done with more than one type of cutter such as in milling the square end on a shaft or reamer shank. In this case, one or two side milling cutters, a fly cutter, or an end milling cutter may be used. However, for the majority of operations, cutters are specially designed and named for the operation they are to accomplish. The milling cutter should be small enough in diameter so that the pressure of the cut will not cause the workpiece to be sprung or displaced while being milled. Selection of Milling Cutters
23. In selecting a milling cutter for a particular job, choose one large enough to span the entire work surface so the job can be done with a single pass. If this cannot be done, remember that a small diameter cutter will pass over a surface in a shorter time than a large diameter cutter which is fed at the same speed. Size of Milling Cutter
