Mount the vice with the bolts lightly finger tight. Mount a steel bar in the chuck, then without switching the mill on, travers the table so that the bar pushes the chuck into alignment.
Make sure that the bar touches the vice all the way along its width.
When you are satisfied that the bar touches all the way along the vice jaw, gently pich up the vice bolts, then repeat the check.
If everything is still OK tighten the vice fully, this procedure should give an accuracy of about 5 thou to 10 thou, good enough for everyday milling and drilling.
For greater accuracy use a Dial Gauge indicator as shown in the next entry.
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