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Monday, 25 November 2013

Construction and Working of Tool and Cutter Grinding Machine

Construction and Working of Tool and Cutter Grinding Machine Points : Construction and Working of Tool and Cutter Grinding Machine, Construction/Main parts of Universal Tool and Cutter Grinder, Table, Headstock and Tailstock, Wheel head, Cutter Grinding Wheels The universal tool and cutter grinder, can be setup for a wide variety of grinding operations. With various attachments, it can do internal, gear cutter, cylindrical and surface grinding. It is designed to support milling cutters, taps and reamers while they are sharpened to specified tolerances. Special attachments permit straight, spiral and helical cutters to be sharpened. Many attachments and specially formed grinding wheels are available. The wheel shapes most frequently used for tool and cutter grinding. Because of the wide variety of work performed, no attempt will be made to cover completely all the possible setups. Construction/Main parts of Universal Tool and Cutter Grinder The machine is constructed with a heavy, rugged box-type bed or base. A saddle is mounted directly on top of the bed. It moves on antifriction ball bearings on hardened ways. Mounted on the saddle is the column supporting the wheel-head. The column is movable up and down and swivel to either side. The wheel angles required for various kinds of work are thus made possible. The saddle also provides the means for moving the wheel-head forward and back. The grinding wheel, can then be brought in contact with the work. Over the saddle is mounted the top base containing the gears and mechanism which control the table movement. The top base supports the ways for the bearings on which the table rests and moves. The sib-tab1e moves longitudinally on the ways and provides the traverse of the work before the grinding wheel. The function of the main parts of the universal tool and cutter grinder is explained below. 1. Table The worktable is mounted on the sub-table. It has T-slots for mounting the work and the attachments used on the machine. The worktable is designed to swivel. With the table slightly turned, the operator can grind tapers. Traverse of the table is controlled by a hand vhee1. Hand-wheels also control the movement of the column and saddle. TI table carries the headstock and tailstock, which, in turn, hold the work-piece. 2. Headstock and Tailstock A headstock and tailstock similar to those on an ordinary lathe are mounted on the table. For cylindrical grinding, the work-piece is positioned between the centers and driven exactly as in the ordinary lathe. The work rotates toward the operator, and the grinding wheel also turns toward the operator. At the point of contact, the wheel and the work are moving in opposite directions. The headstock rotates a chuck for internal grinding operations. 3. Wheel head Back of the headstock and tailstock is the wheel-head. The abrasive wheel or wheels, are driven by a separate motor ‘in the wheel-head. The wheel head can be swiveled and positioned on the base for varied setups. 4. Cutter Grinding Wheels Wheel shape depends on the cutter to be sharpened.t

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