I drew this rectangle and made a tool path out of it by starting in the middle of one of the sides. Then I selected the OffsetMaster command to array the tool paths towards the center. You can see the tool paths go down as you drag the mouse. While the command is active you can change the side clearance or step over and see the tool paths move on the screen. When all looks good a left mouse click creates the tool paths. Two final options at end will connect them up from center out and one even will put a small radius at each connection. This is very useful for slow machines that chatter in corners.

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