Just as Butch said. Say you have a log that is supported on both ends and you want to buck in the middle. As you saw down through, the top of the kerf will start to close, you withdraw the bar almost completely, and plunge it back in. Eventually, the top of the kerf will close, and the risk of...
I ream to prevent binding, and damage to the log.
edit: I'm only working with maybe 4' wood at the most, so not huge, but reaming has worked well for me.
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