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Summary: Learn how to adjust the guide on a motorized miter saw from a construction expert in this free power tools video.
"Hi, this is Ed Reyes with Master Builders from Tampa, Florida. On behalf of Expert Village, this is how you use and maintain a miter saw. Now we are going to talk a little bit about the adjustable guides. In the back we have these black knobs. When you tighten them, normally when you are moving this instrument, you want to tighten them tight so that they both are tightened all the way in so that your saw is uniformed. We could cut this way but as we cut longer boards, the best thing to do is loosen up this knob in the back. This slot slides all the way back. Do the same on this side. What that is going to do is give you more of a uniformed straight cut and when you tighten it, you see that it doesn't move. After you've tightened it, it doesn't move. You can take this board and put it against this. You see you have a lot more room when doing your cut; up or down or sideways. The other purpose for this area here is when you compound this, if this is in, the blade will not cut. You see, it hits. You need to slide it out for a 45 coming all the way down. Basically we use this for cutting longer trim to keep it straight, flush so you get a straight 45 or straight 90 degree cut on that. When you are through, bring it back in, tighten the knob from the back and proceed to the next step. "
eHow Article: How to Adjust the Guide on a Motorized Miter Saw