Tool selection After roughing, the roughing tool is used to finish the groove. Use finish tool commands FeatureCAM to choose a separate finishing tool (that has same characteristics unless you override them).
Ramp on makes the finish pass ramps into the material with an arc equal to a percentage of the tool diameter (see Ramp diameter).
Finish passes and overlap The tool will go around the groove a number of times set by Finish passes, and will overlap the starting point by an amount controlled by Finish overlap.
Ramp off uses another arc of the same size as the ramp on moves the tool away from the finished wall.
Retract removes the tool from the stock area and sets up for the next operation.
See also How is an ID or OD groove machined?.