Machining and Grinding of Tungsten

Tungsten can be machined by turning, milling, or drilling. For thick-walled parts, slight preheating of the work to 400 °F is sometimes helpful; otherwise highly chlorinated oil such as trichloroethylene is used. Using a C-2 Type Carbide Tool, a suggested Geometry is:

• Side Angel: 10°
• End Cutting Edge Angle: 3° to 10°
• Back Rake: 0°
• Clearance: 3° to 5°
• Nose Radius: 1/32" to 1/16" Radius
• Cutting Speed: 100 to 200 RPM

The final shaping of tungsten parts is frequently done by grinding. Silicon carbide wheels with a hardness of J to L and a grain size of 100 to 120 have proven useful for most applications. Since tungsten is hard and brittle, surface checking can be a problem unless adequate cooling is used. An oil emulsion type coolant is recommended.

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