Kamal,
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One way to get parallel rips is to set the fence parallel to the cut and use it for a bump stop. Eventually your 12¡± board will be reduced in width to a point where you can no longer clamp it to the sliding table, though.
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For narrow rips you do not really need fancy parallel guides. Simply clamp scraps to the slider to serve as parallel guides. You¡¯ll spend more time fiddling around getting them set correctly, but it sure works.
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Lucky, instead of measuring from the edge of the slider to see where the cut is I made a simple gizmo as shown. One stick fit to the slot, and a thin scrap of ply glued to it. Put it in the slot and trim it with your rip blade and you will know where the edge of the cut is. Precision is limited by slop in the strip in slider slot and by any variance in the slot itself, but it is really close.
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The hole lets me hang it on a magnetic hook on the side of the saw, handy for use.
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John Hinman
Boise ID
K700S and A941