![]() The strength and uniformity of the workpiece.The feed rate used on a milling machine depends on the following factors: This is a good arrangement and it permits faster feeds for larger, slowly rotating cutters. On the milling machines we have here at LBCC, the feed is independent of the spindle speed. The feed (milling machine feed) can be defined as the distance in inches per minute that the work moves into the cutter. Once the SFM for a given material and tool is determined, the spindle can be calculated since this value is dependent on cutting speed and tool diameter. The softer the work material, the faster the recommended cutting speed (See Figure 1).įigure 2: Increasing Cutting Speed Based on Cutting tool hardness Table 1: Cutting Speeds for Material Types The harder the work material, the slower the cutting speed. The hardness of the work material has a great deal to do with the recommended cutting speed. ![]() Cutting speeds depend primarily on the kind of material you are cutting and the kind of cutting tool you are using. All cutting tools work on the surface footage principle. Surface speed is measured in surface feet per minute (SFM). If two tools of different sizes are turning at the same revolutions per minute (RPM), the larger tool has a greater surface speed. Surface speed, surface footage, and surface area are all directly related.
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