Slewing rings, slew rings, slewing ring bearing, slew ring bearing, crane slew ring, crane slewing ring, ball bearing slewing ring, large diameter slewing ring, roller slewing ring, ball slewing ring generally incorporate a SLEWING mechanism to control rotation of the mobile part. This function can be achieved by various means :
Gear drive (the most frequent case)
Belt drive
Chain drive
Direct drive
slewing ring, slew ring

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