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Graphite Machining

General guidelines for machining graphite and carbon
• Graphite is abrasive material causing fast wear of metallic uncoated cutting tools. Only diamond (preferable) or carbide tools may be used for cutting graphite.
• Graphite and carbon are generally machined dry without using Cutting fluids (coolants). If coolants are used in some machining operations (grinding, honing, polishing) the workpiece should be dried at 300-400°F (150-200°C) to remove liquids absorbed by the material.
• Graphite as compared to metals is machined at higher cutting speed, feed speed and depth of cut;
• Chipping (breakage) of the material in the exit of a cutting pass may be avoided by limiting the depth of cut to a half of the insert length;
• Lowering feed rate in the exit of a pass also prevents chipping;
• Chamfer at the end of the workpiece makes the tool entrance and exit easier and diminishes chipping

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