Work Holding Method

Work Holding Method

In the machining of a complex component, it is usually started off with the milling of a rectangular block. To ensure that each surface of the rectangular block is perpendicular to its neighbouring surfaces, the following points should be noted:-

• The vice jaws and the workpiece must be free from burrs, chips, and cutting fluid.
• Smaller workpiece should be supported by parallel bars to provide the supporting datum.
• Round bar must be placed between the workpiece and the movable jaw to ensure that the workpiece is in perfect contact with the fix jaw.
• The vice handle should be tightened by hand to avoid over clamping of the workpiece as well as the vice. Hide face hammer should be used to assure that the workpiece is in perfect contact with the supporting base.
• On completion of the milling of the first face, the workpiece should be unloaded, deburred, and cleaned before the next operation.
• To machine the second and the third faces, the workpiece should be clamped with its preceding machined surface facing against the fix jaw of the vice.
• Similar clamping method can be applied in the machining of the fourth face.
• Yet it can also be clamped on the vice without the round bar.
• Both ends of the workpiece can be machined with the periphery flutes of the cutter using up cut milling as shown in figure 23.

Holding Method by Using a Machine Vice

End Surface Milling

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