10 Ways to Get the Most from Your Plunge Router
3. Interior pattern routing
When you need to rout any type of closed pattern in the interior of a workpiece, such as the chip/dip tray, shown in photo, choose a plunge router. With a fixed-base router you have to tip the router into the cut—risky because you can damage the workpiece or template or possibly injure yourself.
Whether you use commercial templates or make your own, you'll need to use either a guide bushing or a top-bearing pattern bit to register against the template. For cuts deeper than your bit can reach, use a collet extension, which fits into your router collet and has another collet for your bit.
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