🔍 A spiral router bit has a helical (twisted) cutting flute, unlike a straight bit with linear flutes. This spiral design ejects chips upward or downward (depending on the spiral type) for smoother cutting and less clogging. The result is cleaner cuts with less tear-out and burning compared to standard straight bits:contentReference[oaicite:0]{index=0}. In short, spiral bits cut more cleanly and efficiently because their corkscrew action continuously shears the wood fibers and clears debris, whereas straight bits tend to scrape the material, often leaving rougher edges.

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