Let's illustrate this concept and imagine you want to cut plywood with a 6mm 2-flutes end mill. Where N is the number of flutes of the end mill and Rpm is the rotational speed of the spindle. These concepts can be visually summarized on a graphic, where the feedrate is plotted against the spindle rotational speed, and which helps us to identify 6 different zones.Ĭhip load is expressed in mm/tooth and can be found using the following equation: Feedrate = N x Chipload x Rpm That sweet spot can mean different things depending on your goal: achieving the best surface finish, machining your parts the fastest, or maximizing your tool life. Hence, getting your feeds & speeds right simply means f inding the sweet spot where your tool is spinning at the perfect speed relative to its moving speed inside the material. Optimizing your feedrate is all about maximizing how much material you’re cutting per unit of time, the faster the better in general. Feeds refers to the feedrate, which is your machine's linear speed, mostly expressed in mm/min.Determining the correct speeds is mostly a question of determining how fast you can spin your tool without overheating it while cutting.
Speeds refers to your spindle rotational speed, expressed in rpm (revolution per minute).
