![]() ![]() You can see from the simple formula what a huge impact Depth of Cut and Stepover have on machining time. For a commercial machine shop, optimizing MRR can make a huge difference to your business. If you can get a higher Material Removal Rate, you can shorten the machining time. The machining time spent roughing your workpiece is mostly determined by Material Removal Rate. This formula yields the number of cubic inches per minute your cutting tool is removing. MRR = Axial Depth of Cut * Radial Depth of Cut * Feed Rate (all values in inches or inches per minute for Feed Rate) The Feed Rate, which is a multiplier of the cylinder as it travels along the workpiece.Ī typical MRR calculation looks like this:.The Stepover, which will determine what fraction of the cylinder’s circumference is actually cutting.The Depth of Cut, which determines the length of that cylinder.The most common is the cylinder that is the shape of most cutting tools. Material Removal Rate (abbreviated MRR) is a function of: We want to do it as quickly as we can without compromising Tool Life so much that it isn’t worth it. After all, the purpose of roughing is raw Material Removal. When roughing we want to optimize Material Removal Rate. Let’s be specific about what we’re optimizing. Feed Rate is defined as how fast the cutter is moving through the cut. Stepover is also referred to as Radial Depth of Cut.įor the sake of completeness, Cutting Speed is defined as your spindle speed (in rpm) in the cut. It can be no more than 100% of the cutter’s diameter. Depth of Cut is also referred to as Axial Depth of Cut.Ĭut Width, also called Stepover, is the total thickness of the cut when viewing the cutting tool from above. So, if you’re doing a pocket in several steps or layers, it is the thickness of the current layer you’re cutting and not the total depth of the pocket. Since a picture is worth a thousand words:ĭepth of Cut is the length of the side of the flutes that are actually cutting. Let’s start by defining the terms “Depth of Cut” and “Cut Width” (also called “Stepover”). ![]() That means we can unlock a lot of potential by adopting a more scientific approach to Depth of Cut and Stepover. Your choice of Depth of Cut and Stepover will limit Cutting Speed and Feed Rate. Unfortunately, most CNC’ers have no scientific way to choose Depth of Cut and Stepover. Most CNC’ers calculate Cutting Speed and Feed Rate using science. Click here to learn more about the Master Class.Ĭutting Speed, Feed Rate, Stepover, and Depth of Cut.īefore you can generate the g-code for any given feature, CAM software needs to know those things. Note: This is Lesson 5 of our Free Email Feeds & Speeds Master Class. Optimize Depth of Cut and Stepover for Better CNC Milling ![]()
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