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· Marine Engineer
4,963 Posts
Bits for plunge cutting usually have an extra cutter on the end for "drilling" down into the workpiece as you plunge. These bits include straight bits, plunge round-over bits, etc. The extra cutter is needed so that the bit can remove the material beneath it as it enters the wood.

If you want to put a detail in the middle of a board, you can use a plunge straight cutter first to make a clearance cut, then use a regular bearing profile bit with the bearing removed.
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