For example: if you were to fasten a half inch piece of MDF, the same length and height as your fence, to your fence, you could partially bury (by raising slowly up through) your saw blade into the sacrificial fence to use for jointing an edge on a shorter board. Nothing replaces the job of a real jointer, but I've done it.
Also if you've ever had your fence dangerously close to your blade, you know it's kind of nerve racking. The aux. fence lets you not worry too much about wrecking a good blade, not to mention the flying bits of metal towards your face.
You can also screw or clamp jigs into/on to it, makes it a little easier and very versatile.
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