![]() Don’t worry! If FPT is your other driving factor, setting RPM to the machine max will adjust your feedrate and SFM to match and you will get a recipe that your machine is capable of doing – albeit a little slower than if you had the full RPM range. Trying to run a small tool at the same surface speed may calculate an RPM that is higher than your machine is capable of.If your main parameters are surface speed and FPT and your DOC and WOC are set as percentages of your tool’s diameter you can EASILY transfer this recipe to a tool of another size and have a great starting recipe. Most importantly, this makes recipes “scalable” – meaning you can move between tools of different sizes and use a similar recipe as a starting point.Materials have an optimal SFM range, whereas there is no optimal RPM because cutting conditions change drastically with two different diameter tools at the same RPM.Many manufacturers give SFM recommendations for a tool, and not RPM.You can also be sure a smaller tool isn’t taking on too much material which is especially important in machines with RPM limitations. This tells you exactly how much material your tool is cutting off each time a flute contacts the work, letting you adjust how conservative/aggressive your recipe is easily.However – we strongly recommend using FPT and Surface Speed to control your cuts! Why? ![]() If you’re a beginning machinist, you’re probably most familiar with RPM and feedrate – and that’s okay! You can easily become familiar with creating recipes based solely off of these two factors, especially when using the same sized tools in the same material. Width of Cut: Also known as radial depth of cut (WOC or RDOC), this controls the width of the chip and how much of the tool’s diameter is engaged in the cut. This is an important concept because a larger tool will cut at the same speed with a lower RPM as a small tool with a higher RPM.įeed per Tooth: FPT controls the thickness (or approximate thickness, we’ll get into this later) of each chip whereas width of cut controls the width of the chip.ĭepth of Cut: Abbreviated as DOC or ADOC, depth of cut controls the length of the flutes that are cutting the material and consequently the height of the chip. (For all you physics people, surface speed is your angular velocity while RPM is rotational speed). Surface Speed: This is the speed the tip of your flutes or cutting edge is moving with respect to the center of the tool. This is how fast your tool is spinning, but not how fast the flutes are moving.įeedrate: This is how fast the machine is moving on any of its axes (essentially how fast your part is moving) with relation to the tool. RPM: This is how many revolutions per minute your tool is spinning. There a few main criteria you need to be familiar with when starting with feeds and speeds: With the nearly endless combination of tools and materials, getting the recipe right on the first try can seem impossible – but we’re here to tell you how it can be easy! Important terms every machinist should know Often times, learning speeds and feeds is the most difficult part for a beginning machinist.
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