A trunnion is a rotary table supported on both ends (like an axle) that tilts and rotates the workpiece — providing two of the axes in a 5-axis machining center. Because it's supported at both ends, a trunnion is rigid and accurate, well suited to smaller parts machined on all sides.
The trunnion typically provides an A-axis (tilt) and C-axis (rotation), letting the tool reach five faces in one setup.
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