Machining PTFE (Teflon): Speeds & Feeds, Tooling & Best Practices

Material Properties & Machinability Profile

PTFE (Teflon) is classified as a Fluoropolymer Plastic widely specified for mission-critical components requiring Chemical diaphragm valve seals, cryogenic gaskets, and high-frequency coaxial dielectric isolators..

Engineering Kinematics & Cutting Parameters

• Material Hardness: 55 Shore D.
• Recommended Cutting Speed ($V_c$): 100 - 300 m/min with dedicated substrate coatings.
• Chip Load ($f_z$): Maintained between 0.08 - 0.20 mm/tooth to prevent tool rubbing or excessive mechanical shock.
• Machinability Challenge: High tendency to cold flow, deform under clamping pressure, and generate continuous burrs; requires razor-sharp polished cutters.
• Tooling Strategy: Employs high-pressure flood coolant (>= 30 bar) and micro-grain carbide or specialized inserts with positive rake geometries.

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