There is no "set it at this" because even with the setting tool , each machine and user is unique. It varies depending on how far your blade is protruding, the type of vinyl, etc. Also cutting vinyl on a mat (which I do because I mainly do smaller pieces) can be different than cutting straight off the roll. We have people cutting "normal" vinyl anywhere from a force of 2 to 30. (I cut regular vinyl on a mat at 20, but the Duck brand I need almost 40 because it is thicker). Use the test button - it should be your best friend when determining the proper force, and then keep a log when you get the clean cut that goes through the vinyl but not the backing. Trial and error with the test cut is the best teacher.