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Monday, 25 November 2013

Holding Devices and Accessories used on Grinding Machines

Holding Devices and Accessories used on Grinding Machines Points : Holding Devices and Accessories used on Grinding Machines, Work Holding Devices used on Surface Grinding Machine, By Clamping Direct on the Table, By Using a Permanent Magnetic Chuck, By Using a Vise, By Using Index Centers, By Using a Sine Plate or a Perma Sine, By Using V-Blocks, By Using Double Face Masking Tape Numerous work holding devices, accessories and wheel dressing attachments are available for use on different types of grinding machines. Work Holding Devices used on Surface Grinding Machine Following holding devices or methods are used for holding different jobs in position while working on surface grinding machine. Work-piece may be mounted on the table of the machine: 1. By Clamping Direct on the Table The table of the surface grinder is usually provided with T-slots. The work can he bolted directly to the table top, by using the T-bolts and clamps or straps: Work should be properly aligned and positioned. For this purpose sometimes parallels, step-blocks, small screw jacks, angle plates etc. may be used. 2. By Using a Permanent Magnetic Chuck Much work done on the surface grinder is held in position by a magnetic, chuck. Mount the chuck on the table and clamp it in position. Plate the work-piece or pieces on the chuck. With the work in position, move the control lever 180 to the right. For safety, use back or end stops if the workpiece has only small contact with the. chuck. Flat pieces of metal that are thinner than the workpiece make good stops. Magnetic chuck holds the work by exerting a magnetic force. Nonmagnetic materials can be ground by bracing with steel blocks or parallels to prevent sliding. The magnetic chuck, makes use of a permanent magnet, eliminating cords and danger of the electrical connection being broken accidentally, permitting the work to fly off. The Electromagnetic Chuck, makes use of an electric current to create the magnetic field Frequently, work mounted on a magnetic chuck becomes magnetized and must be demagnetized before it can be used. Demagnetizer may be used to neutralize the piece. 3. By Using a Vise Plain, swivel, and tilting vise (universal vise) may be attached to the worktable or held on a magnetic chuck. In this manner workpieces may be held at any angle required. 4. By Using Index Centers Mount the index head and footstock on the table of the machine, aligning them by means of the tongues on their bases. Clamp in position, place a driving dog on the work. Then place it between centers and position it with respect to the grinding wheel. 5. By Using a Sine Plate or a Perma Sine A sine plate, or a perma sine, may be used when work-pieces are to be ground to very precise angles. The work is attached to the sine plate by bolting or clamping; the perma sine holds the work-piece magnetically. 6. By Using V-Blocks Round work-pieces may be mounted in V-blocks on a magnetic chuck, or be clamped directly to the machine table. 7. By Using Double Face Masking Tape Double faced masking tape can be used to hold thin work-pieces of non-magnetic materials.

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