![]() 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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