Understanding how feeds and speeds work can help achieve the best surface finish, optimize your machining speeds, and maximize the life of your tools. “Speeds” refers to your spindle rotational speed, expressed in rpm (round per minute), while “Feeds” refers to the feed rate, which is your machine linear speed, mostly expressed in mm/min. Getting them right is about finding the perfect spot where your tool is spinning at the perfect speed relative to its moving speed inside the material. Explore