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Exact stop check

A CNC action using the G09 word which overrides the look-ahead buffer. It momentarily stops the controller at the end of a command so that the cutter can reach a fully stopped position before continuing with the next command. This is required if the machine acceleration and deceleration is such that the next command begins too early (leaves a radius as shown below) or begins too late (leaves a nip on the corner from the overshoot shown at bottom of page). The only way to remedy these problems is to ignore the look ahead and make the tool path finish its entire move before continuing. G9 is a one shot. See also G61