![]() ![]() In the spirit of full disclosure, you can find the simple formulas in a lot of places, but I’ll link to Wikipedia. But, and this is important, there is a lot more going on than the simple formulas used to derive cnc feed rate and spindle rpm can account for. Can I do those “Basic Formula” calculations, perhaps in a spreadsheet?Ībsolutely! All the information is available. You need to be able to get your hands on good feeds and speeds for your machine, tooling, materials, and best practices any time you need it. To be a successful CNC’er, you need to be in control of your feeds and speeds. You have no idea how much deflection was there (I call tool deflection the “silent tool killer”) or what kind of shape the cutter was in when finished.Īnd those guys you ask on the Internet? You really have no idea what’s going on there. What were their criteria for testing? How thoroughly did they test?Įven when you have a video, you don’t really know unless they test to destruction of the tool in the video much more than that on that particular machine, when the tool was set up by that particular person, with that particular material, the tool lasted long enough to make the video. The first problem is you have no idea what kind of quality you’re getting from these outside sources. Oh my! These things are all so limited, time consuming, and potentially expensive. You can even spend money to join a service where experts will give you their tested recipes, complete with videos so you know it works. Someone wants to know the best Feeds and Speeds for some new material or with some new tool. You see this all the time on the Internet in the forums. Why can’t I just ask other experienced CNC’ers about their Feeds and Speeds? ![]() If you want to know more about other options, keep reading. If you’re ready to accept a Feeds and Speeds Calculator and want to move on and learn other things, click here. – By far the most popular option is to use a Feeds & Speeds Calculator such as our G-Wizard. Our G-Wizard Feeds and Speeds Calculator covers 60 variables! When was the last time you looked through 30 charts to figure feeds and speeds? You basically can’t do it, which is why: For example, a feeds and speeds chart is a 2 dimensional table. That data is important, but used by itself, it’s also loaded with limitations. – You can rely on data from the Tooling Catalog feeds and speeds chart. BTW, one of the reasons CAM does such a lousy job is it takes the approach of databasing standard cuts. After all, are all of the pockets you cut the same depth? There are variances in every job and if you’re locked into just a few standard cuts, you’re missing out on the possibilities. This method is pretty popular, but it sure is limiting. – You can rely on standard cuts that have worked in the past or rules of thumb. You can’t hear somewhat bad and you sure can’t tell the difference between ok and really awesome feeds and speeds. None of that happens because you can only hear really bad feeds and speeds. If it did, you could buy “ear training” CD’s for machinists and Boeing would require you to pass a feeds and speeds by ear audio test before they would hire you. This requires quite a lot of experience and even though it has its devotees, it basically doesn’t work. ![]() Most CAM software does a truly lousy job with feeds and speeds. The reason is simple, and we uncovered in our CAM Software surveys. – Amazingly few use their CAM software, even though most CAM has provision for it. It’s pretty antiquated, especially for CNC applications. – About the same number use Machinery’s Handbook. Basically, it’s a lot of work for a lot of limitations. This is the least popular for reasons I’ll discuss. This Guide is here to make that learning curve much easier for you!įor starters, it’s worth asking, “How do machinists determine Feeds and Speeds?” We surveyed our readership and here’s what they said: The answer, by a wide margin, was that Feeds and Speeds are the hardest thing to learn in CNC. We surveyed our readers to ask experienced CNC’ers what the hardest CNC concepts and techiques to learn were, and here’s what they said:įeeds and Speeds are the hardest thing to learn in CNC… But they involve a lot of different concepts, which can make them hard to learn. How Do Machinists Calculate Feeds and Speeds?įeeds and speeds are important, because they’re the key to Longer Tool Life, Faster Machining Speeds (through higher Material Removal Rates), and Better Surface Finish. ![]()
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