Many years of experience Has proven to me ,Tools are designed to operate at a certain speed,just like your chart says,Varible speeds ,are set to the work intended ,by the tool chosen .When IT doesn'twork WELL IT"S time to stop ,sharpen the tool if needed ,or locate the other problem ,BRUTE FORCE HAS NOW PLACE IN YOUR SHOP ,the speed of the tool MUST control the the JOB ,other wise damage and failure ,and injury are certain ,BRUTE STRENGHT AN IGNORANCE Have No Place in your shop for VERY LONG. IMHO