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USP280 End Mills Series
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Helical boring can be used to rough or finish machine a particular bore. One of the advantages to this method is the ability to machine many different diameters with the same diameter tool. For example a .500” diameter tool can bore a diameter from .550” up to a .900” diameter. For roughing applications it is typically suggested to use a ball end tool with no more than .05” flute length. If the flute length is too long the tool will tend to deflect resulting in a taper in the hole. Normally climb milling is best suited for roughing applications. It is highly recommended to “ramp off” in an arcing motion when exiting the cut. Do not let the tool dwell when moving out of the cut. When finishing, the Millstar tools of choice are ball nose (RB), toroid (TO) and back draft (BD) style inserts depending on what features are required on the floor of the bore. Millstar’s solid carbide line of tooling can be used for smaller diameters as well but the tool will have to be relieved so that no more than .05” of flute length is available. An example of helical boring with a toroid insert tool is shown in the illustrations below.
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