A spiral saw is a type of router which works by running a spinning bit sideways against whatever material you're cutting. The bit comes down through a flat base with a hole in the center that holds the bit perpendicular to the surface as you move the saw sideways. It's slower than a jigsaw, but makes a much cleaner, more precise cut. Cutting previously installed drywall is among the uses for a spiral saw if you need to cut out the hole for, say, an electrical box.
Instructions
1. Hold your template against the installed drywall where you want to make the cut. Trace around it with your pencil.
2. Run your electronic studfinder over the area to make sure there's no wood behind the marked area. If you find there is a stud within an inch or two of the marked area on any side, adjust the position of the marks so it will miss the studs.
3. Set up you spiral saw with a wood-cutting bit. Adjust the base of the saw so that the bit protrudes about 1 inch past the base.
4. Hold the bit over the middle of the marked out area, and turn on the tool. Slowly sink the bit into the drywall until the base of the saw is pressed flat against the surface.
5. Immediately start moving the saw in a clockwise direction, toward the marked line. When you get to the line, trace along it with the bit in a clockwise direction. Don't force the saw, but let the movement of the bit do the work. Trace the line completely until the piece falls out.
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