Machining Plastic 3X Faster
Why It Matters
Accelerating Delrin machining reduces lead times and labor costs, giving manufacturers a competitive edge in low‑volume, high‑precision plastic parts.
Key Takeaways
- •Use 100,000 stepover at 600 ipm to reduce heat.
- •Finish Delrin with feeds similar to 6061 aluminum for surface quality.
- •Employ through‑coolant drilling at 200 ipm for fast minor‑diameter holes.
- •Deburr all edges in‑machine to avoid post‑process chip removal.
- •Soft‑jaw fixturing increases clamping force without overtightening excess.
Summary
The video demonstrates how to machine blue Delrin on a Scle X9 CNC mill, targeting a three‑fold speed increase over conventional methods.
The presenter outlines a rough‑then‑finish workflow: a 100,000 µm stepover at 600 in/min keeps heat low during roughing, while finishing uses feeds and speeds comparable to 6061 aluminum. Through‑coolant drilling at 200 in/min and tapping at 2,000 RPM with a 1/4‑in tap push cycle times to their limits.
Key examples include using a ½‑in three‑flute end‑mill for 3/4‑16 threads, a ¼‑in chamfer tool for deburring, and soft‑jaw fixtures that maximize clamping without overtightening. The part achieved a 32‑microinch surface finish and passed inspection without any post‑process deburring.
By eliminating secondary deburring and maximizing spindle speeds, manufacturers can cut cycle times dramatically, improve part quality, and leverage the Scle X9’s capabilities for high‑volume plastic production. The video also promotes the MFG Connect app for sharing toolpaths and networking.
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