Understanding Guide Bushings
To use a guide bushing, you need an edge guide or template to follow. You'll want to size the template slightly larger or smaller than the workpiece. Templates can be made of just about any material, but we prefer 1/4" hardboard.
To make a template, simply affix your drawing or pattern to the template material with spray adhesive, and then bandsaw or scrollsaw it to shape. After completing the cut, file or sand-smooth any irregularities or rough spots on the template edges.
Attach the template to your workpiece with a few drops of hot-melt glue or double-faced tape. Use a router pad to hold your workpiece in place on your bench while you rout. If you are going to rout completely through the workpiece, attach a backer to protect the router pad and benchtop.
Using a straight bit that fits through the guide bushing, rout out the waste area surrounding the template. Remember to rout counterclockwise when cutting around the outer edge of a template, and clockwise when routing the inside. Once you're finished routing, gently separate the template from the workpiece with a chisel.
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