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Turntable torque requirement
Hello,
I am designing material handling car with a rotate function. The car uses a 47" slewing ring bearing. The load being turned is approximately 70,000 lbs and needs to rotate 180 deg in 5 seconds. I am trying to determine the amount of torque needed to size a hydraulic motor that will be used to rotate the assembly. I've started with T=Ia but am not getting any numbers that make and sense. What am I missing here??? I've attached a jpeg of the setup. Thanks in advance,