Kelly
18 July 2017Kelly spinner
18 July 2017Kelly
18 July 2017Kelly spinner
18 July 2017Special device that, when fitted into the master bushing, transmits torque to the kelly and simultaneously permits vertical movement of the kelly to make hole. It may be shaped to fit the rotary opening or have pins for transmitting torque. Also called the drive bushing. See kelly and master bushing.
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