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Published byAgatha Cain Modified over 8 years ago
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Machining Plastics Joe Latchaw Carl Caldwell Doug French
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Why? For small production volumes Prototype production Shapes impossible by injection molding Create certain features more precisely Threads Lower stresses
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Why? (cont.) For long holes Unacceptable injection molding aspects Parting line, ejection marks, flash, draft Large or thick section parts Short lead time Secondary operations on injection molded parts
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Common Machining Processes Drilling Sawing Milling Turning
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Common Machining Processes (cont.) Routing Waterjet cutting Laser cutting
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Tooling Requirements Sharp Highly positive
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Other capabilities Micro parts Annealing Polishing While being machined Flame Vapor Mechanical buffing
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Applications Any applications Medical Electrical Aerospace Fiber optics
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Common Materials Acetal Acrylic ABS Nylon PEEK
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Common Materials (cont.) Polycarbonate Polyethylene Polypropylene PVC
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Plastics Machining Shop Metal machining contaminants Material knowledge Material discount Plastic based equipment Higher quality Lower cost
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Advantages Smaller quantities Less tooling problems & delays No common effects of injection molding Lower nitial cost CNC benefits
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Advantages (cont.) Lower stresses Consistent properties Tighter tolerances Thicker parts
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Disadvantages Longer cycle times Higher part cost Waste Thermal Expansion Dissipate heat slower
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