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Okay after playing around a little I think I have come up with a solution. First do a pocket to the depth of the tabs and cut them out of the way. Then cut a second pocket that encompasses the area inside the tabs with a finish bottom. Do these as separate cuts it will give you better results on the tabs. From there do the sides as you were doing it but use lighter radial cuts on the roughing passes at a higher feed rate you can remove the same amount of material just as fast or faster and it will be easier on your cutter. Under strategy tab I turned off the minimize tool retract and leaving climb cut, rough pass, Depth first, rough cutter comp, finish bottom, and ramp from top on (checked). I left the step overs as is but increased the RPM to 2000 aluminum cuts really well at surface speeds between 900 and 1200 sfm. Most of the time I program in sfm rather than rpms so I don't have to spend all day doing calculations. you could easily push this higher if your machine can handle it. I have a daytron that I run 6mm cutters in aluminum at 50,000rpm all day every day which is way over the recommended sfm but aluminum loves to be cut when you get the chip right. with that in mind it is a matter of your cutters, holders and machine asto what you can run at. I changed the finish allowance to .01" with a .25 Z axis rough increment. I think that was everything hope it helps good luck. If it works please accept as solution