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Spindle vs Router Reconsideration. Spindle Motor Considerations. Feasibility Air motors - Infrastructure (air dryer, supply regulator, etc.) - Rare and Expensive (All supplier quotes over budget) + Easily reach speeds of 100,000+ RPM DC motors
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Spindle Motor Considerations • Feasibility • Air motors - Infrastructure (air dryer, supply regulator, etc.) - Rare and Expensive (All supplier quotes over budget) + Easily reach speeds of 100,000+ RPM • DC motors + Simple implementation (voltage or PWM speed control) - Low speed (12,000 RPM unless specialty and over budget) • AC motors +/- Inexpensive and common (many vendors, but little documentation, no warranty) - High complexity (VFD speed control, could be purchased) + Acceptable speeds (24,000 to 48,000 RPM)
Reconsideration of Commercial Routers + Affordable at around $200 + Available at any home improvement store + Speed of 16,000 to 35,000 RPM + Mounting documentation available from gantry manufacturer + Aftermarket collets with published TIR < 0.0004” + Can control speed with PWM or built in dial Bosch PR20EVSNK Colt and aftermarket collet from precisebits.com
Spindle Speed and Feed Rate • Low Feed Rate and High Spindle Speed for small mill bits (< ~0.020”/0.5mm) • High Feed Rate and Lower Spindle Speed for larger mill bits ( up to 0.125”/3.175mm) • For a 0.015”/0.38mm mill bit on .5 to 1 oz Copper: 10 to 40 in/min @ 24,000 to 60,000 RPM • For a 0.625”/1.6mm mill bit on .5 to 1 oz Copper: 60 in/min @ 24,000 to 40,000 RPM