Tool sales representatives can be a valuable resource, so if you do a lot of machining, develop a good relationship with a knowledgeable representative.Īnother source of speeds and feeds data is CAD/CAM software. Much of this data is found on manufacturer’s web sites or printed tooling catalogs. The best source of data about cutting speeds and feeds for a specific tool, application, and material is the tool supplier. These speeds and feeds can, and often are, adjusted at the machine based on chip shape and color, cutting sound, and machine horsepower meter readings. This selection is actually more difficult on a CNC than a manual mill because, with a manual mill, the operator can feel the cutting pressure and alter the feed based in part on the cutting force.ĬNC mills require calculating speeds and feeds in advance. Probably the most vexing problem for the beginning CNC machinist is selecting proper cutting speeds and feeds. The tool moves through the material at a specified rotational speed, defined in revolutions per minute (RPM), and feed rate, defined in inches per minute (IPM).
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