Headstock-Tailstock vs. Trunnion vs. Turntable Positioners
How headstock-tailstock, trunnion, and turntable positioners support and rotate heavy parts: axis geometry, CG offset torque, bearing moment, and controls.
Sizing a Positioner: Payload, CG Offset, Overturning Moment, and Torque
A worked example for sizing a tilt-and-rotate positioner: combined CG, rotation and tilt torque, bearing overturning moment, base stability, and derating.
Positioner Rated Capacity vs. Real Capacity: Eccentric-Load Derating
Why a positioner's rated capacity overstates real capacity for off-center loads: bearing load factors, raceway and bolt limits, and reducer overhung load.
Rollover and Turnover Fixtures for Large, Heavy Assemblies
How rollover and turnover fixtures turn large, heavy assemblies: CG travel over center, tandem-crane load shift, lift planning, standards, and controls.
Multi-Axis Test Positioners: Error Sources and Testing Under Full Load
What a full payload does to a multi-axis test positioner's accuracy: bearing stiffness, gear backlash, encoder placement, servo bandwidth, and loaded testing.