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This method is the quickest way of aligning a vice and being sure it is done to the highest possible accuracy parallel to the milling table.
The vice is set loosely on the milling table. One bolt is just tight enough to stop the vice rotating easily. The other is loose.
An accurate bar about 25mm wide, 5mm thick and 300mm long is fitted so it sticks out one side of the jaws. A lot of rolled bar is good enough to do this or else a piece of gauge plate will be. An angle plate is set against this. A square is set against the back edge of the milling table.
The vice is rotated so the bar just touches one side of the angle plate and the square touches the other side. This is made much more easy with a square clamp.
When this is the case then the vice is bolted up tight on both sides.