Just completed work on a vacuum chucking system. The chuck itself came from eBay, it's aluminum, with a sealed bearing and 3/8" tubing that extends through the headstock. Much simpler than the rotary coupler on most systems, but not as versatile. The vacuum pump came from Craft Supplies. The platform/backboard is attached to a small hand truck for portability. As it sits I can pull maximum vacuum of 24 inHg.
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