From Shopbot Wiki

There are some 3d probing situations like patterns where there are holes in the blank or probing continues beyond the edge of the blank like on a surfboard, when the body of the probe might hit the edge of the blank before it gets to the absolute maximum depth value that you set. This setting lets you select a value that will limit ANY ONE PLUNGE to that depth so that the z-axis will never move down more than that much in any plunge.

David Beede
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