10/6/2023 0 Comments Fishtail end mill bits![]() For harder materials less prone to melting, you can use more flutes: just be careful with your cut depth, so you don't break the bit by trying to carve too deeply into a hard material.So you got your new CNC and have no idea what the difference between a straight cut and a compression cutter is? That's ok, I was the same and I am sure everyone goes through the same motions. You will want to use a single or 2-flute end mill for a material this soft. For instance, a soft plastic like HDPE will melt if the chips are not expelled from the bit quickly enough. By using fewer flutes, you can remove material quicker but will have rougher edges on your cuts.Ĭertain materials require you to remove material faster than others. This means you will need to use a slower feed rate, so the bit has time to properly dispose of the cut materials. More flutes also means there is a smaller surface area to eject cut chips away from your stock material. Generally speaking, more flutes on an end mill means a smoother edge finish. Fluted bits get their names based on the number of flutes present on the bottom of the bit (for instance, our 2-flute bits all have two cutting edges). If your project requires shallow cuts, it may not be the best choice because only the bottom (up-cut) portion of the bit will be used, and the top (down-cut) portion of the bit will not be used to finish the smoothing.įlutes are the cutting edges on a bit. As a result, these bits are recommended primarily for thicker materials which will be cut through entirely. This is achieved by the lower part of the bit utilizing the up-cut style, and the upper part of the bit utilizing the down-cut style. Additionally, the top edges of your cuts will be smoother than if you use an up-cut bit.Ĭompression bits have a primarily "neutral" cutting action and smooths both the top and bottom edge of the cut pass. The benefit to this style of bit is that, by pressing down against the material, it can help thin materials remain secured to your cutting surface. This cutting style is prone to melting or burning your material, especially if your job requires many passes. However, because of the bit's design and upward-pulling motion, it can fight the clamping system you use with your material, especially if your material is thin.ĭown-cut bits push the chips downward (towards the material). It pulls heat away from the bit, and is a good choice for plastics, metals, or other materials that are prone to melting or burning. Up-cut bits expel the cut material upward and smooths the bottom of the cut pass. The cutting style of a milling bit identifies which way the material chips are removed from your project, in addition to which side of the cut surface is smoothed. ![]() It is most important to make sure your bit fits in your spindle/router (shank diameter) and then use choose the bit with the right cutting diameter for your project. Shank diameters and cutting diameters are not always the same. If your job has detailed elements that cannot be cut by your selected bit, Easel will recommend you select a smaller bit. When selecting the right bit for your project, aim to select a bit with the largest possible cutting diameter for your job. Cutting diameters can range anywhere from a few inches (for leveling surfaces) to 1/64" or 1/32" (for very fine details). The cutting dimeter is the overall cut diameter of your bit. Inventables'1/8" collet adapter for the DeWalt 611 is a common upgrade many of our customers make as they start doing more complicated, detailed work. If you want to use bits that have a smaller shank diameter, you'll need to buy a collet and nut adapter for your router. For instance, the DeWalt 611 router holds bits that are 1/4" in shank diameter. Many routers are designed to hold a specific diameter bit. This end of the bit is inserted into your router. ![]() The shank diameter is the diameter of the non-cutting part of your bit.
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