It's a guide arm that attaches to a jigsaw to aid in cutting straight lines or circles. <P>When cutting a circle, you use the rip fence like you would a compass: a point stays anchored in the ...

Cutting a circle out of wood is usually done with a jigsaw and takes a very steady hand. A router is a more precise way to cut a circle, but it takes some time to set up a jig.

Instead cut close to the line then use a belt sander to finish rounding, which makes for more accurate circle. This air hockey table should only take a weekend to make, but could entertain your ...