Whether you're making a straight or angled cut, the first step is always to make sure that your saw table and blade are at right angles to each other. I like to use a small engineer's square, and hold it right next to the blade to see if it's parallel. If it's not "spot on", I loosen the knob that sets the angle, and tap the table gently until it's right. You'd be surprised at the precision of this non-technical approach.
Some people make a shallow cut into piece of wood, then see if the back of the blade will fit precisely into the slot. If you do this, use a blade with a very small kerf or you can "fudge" your results. However you determine square, tighten the adjusting knob so it can't slip, and move the gauge, if necessary, so it is set to zero. Sometimes this is done by loosening a screw, other times by moving the label. Now you can use the gauge with some confidence, although a quick check is never a bad idea.
Once you've set the table properly, you can use the saw's gauge, or a magnetic angle gauge, to set the cutting angle. And if you do angle cutting, always reset your table to zero when you've finished. Of course you'll notice large table tilts, but a tilt of 2 or 3 degrees may not be apparent if you're not expecting it, and can really mess up your straight cuts.
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