This Unidentified Flooring Oddity Turned Out to Be ‘Resonance’

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Above left, the chatter marks showed up perfectly perpendicular to the floor, even when the big machine was run at an angle to the floor. Above right, the final result after sanding with a multi-head sander.
Above left, the chatter marks showed up perfectly perpendicular to the floor, even when the big machine was run at an angle to the floor. Above right, the final result after sanding with a multi-head sander.

I recently got pulled into a wood floor sanding mystery in a desert area of New Mexico. In a region known for oddities from outer space, we had our own UFO: Unidentified Flooring Oddity. Things for the flooring contractor had gone from hero-to-zero faster than you can spell Albuquerque when, after staining, strange marks in the flooring became apparent.

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