![]() ![]() Ballnose bits create a rounded bottom of your cut. Fishtail bits produce a flat surface at the bottom of your cut. The tip of a milling bit helps determine its purpose. 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.įishtail Bits, Ballnose Bits, and Speciality Bits 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. 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. Here are the relevant excerpts from that article: It does not store any personal data.We also have a support article that explains the types of milling bits and why you would choose one type over another: The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. The cookie is used to store the user consent for the cookies in the category "Performance". This cookie is set by GDPR Cookie Consent plugin. The cookies is used to store the user consent for the cookies in the category "Necessary". The cookie is used to store the user consent for the cookies in the category "Other. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". The cookie is used to store the user consent for the cookies in the category "Analytics". These cookies ensure basic functionalities and security features of the website, anonymously. Necessary cookies are absolutely essential for the website to function properly. ![]()
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