Step 1: Materials
Vise Nuts and Bolts
A Rubber Mallet (Or piece of wood. Or your hand. Just something softer than the vise)
Dial Test Indicator
And a collet (that fits the dial test indicator)
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Step 2: Clean Everything
Take a shop towel and wipe down the table bed. Errant chips will throw off flatness and may mar the table or vise surface. If the vise is going to be in position for a long time, coat the table with a little oil to prevent rusting. Clean the bottom of the vise with a shop towel and place vise on table. Put t-slot nuts and bolts in position, but leave them loose.
Step 3: Roughly Square the Vise
With both hands, slide the vise toward and away from you to get a sense of it's range of motion. Try to center the vise within its range of motion. If one side hits maximum during adjustment, you'll have reset and start over. To save time during adjustment, use symmetric features on the vise to roughly square the vise with the t-slots.
Snug the t-slot bolt on the left side of the vise. A good feel for snug only comes with practice, but try turning the bolt until you feel the table and vise make contact, then maybe a quarter turn more. We want it snug enough that the vise doesn't slide, but not so tight the vise can't rotate slightly when we tap it with the hammer. The closer your initial alignment, the tighter you can secure this bolt initially. Tighten the right bolt so the table and vise just make contact, plus maybe a 1/16 turn. We want the left side mostly fixed, with the right side just loose enough that it'll allow the vise to rotate with a firm tap.