![]() Feed and speed choice depends on the material you are cutting, the type of tool you use, the speed of the router, the rigidity of the machine, and even the geometry of the model. Without the proper planning, you can expect many headaches along the way including broken tools, broken material, and an uneven or rough surface finish on your project. There are engineers whose job is knowing how to properly balance all these numbers and apply them based on part geometry, desired finish, and the total job cutting time. ![]() Learning how to tie a tool’s size and shape to its movement, rotation speed, material type, and material removal rate is nearly an art form. We generalize these variables under the term ‘feeds and speeds’, and each cutting tool has a different set of ideal feeds and speeds. How much material the tool is removing at any given time (depth of cut & step over)Įach of these factors must be suited to the properties of the material that you’re cutting cutting through foam can happen much faster than cutting aluminum.How fast the tool is spinning (spindle speed).How quickly the tool is translating (feed rate/plunge rate).Finding a happy medium between these two extremes is a balancing act between three main factors: Similarly, a bit that’s moving too fast can burn or melt the material that you’re cutting. For example, imagine trying to cut through a plank of wood with a saw except instead of moving the saw back and forth you’re just trying to push it directly through. ![]() ![]() When cutting material with a rotating bit, you can imagine that going too slow will dull or break the bit very quickly. ![]()
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