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Geometry of
Ice Resurfacing

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A Zamboni resurfaces a rink without retracing its own track by driving in slightly overlapping concentric ovals, approximately one-half the width of the ice. This is usually accomplished in a clockwise motion, although direction is irrelevant.

The actual number of passes required to complete the task is determined by the overall width of the rink and the width of the Zamboni blade. Many NHL arenas now employ two Zamboni machines at the same time to cut resurfacing time in half.
typical Zamboni pattern