🔍 It’s best to take **shallow passes** when surfacing. A typical depth per pass might be around **1/16\" (1.5 mm)** or up to **1/8\" (3 mm)** at most, depending on your router’s power and the hardness of the wood. Taking off too much at once can overload the bit or cause your router to bog down or bite into the wood unevenly. You’ll get a smoother result by removing material gradually. So, if a slab is very warped, you might take multiple passes, lowering the bit slightly each time until the entire surface is cleaned up. Yes, it’s a bit of patience, but shallow passes ensure a cleaner cut and put less stress on the tool and the router.

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