Ball Bearing Slewing Ring

A bearing quotation starts with the complete load case: maximum and average axial load, radial load, tilting moment, target speed, duty cycle and service factor. The mounting envelope and drive arrangement then determine the practical ring and gear configuration.

The SW reference range covers outside diameters from 565 to 1744 mm (22.24 to 68.66 in). Final model selection uses the submitted load spectrum and the selected ring's load curve rather than outside diameter alone.

slewbearingtec can work from a new equipment envelope, an existing drawing or a replacement bearing. A complete input package shortens the engineering review and prevents a dimensionally similar ring from being quoted for the wrong load or drive condition.

1. Define the interface. Provide outside diameter, bore, overall height, rotating ring, inner and outer bolt circles, hole sizes, pilots, gear position, module, tooth count, pressure angle, lubrication ports, seals, clearance or preload and required axial and radial runout.
2. Define the duty. Provide maximum and average axial load, radial load and tilting moment; operating and peak speed; daily running time; shock factor; ambient temperature; dust, water and corrosion exposure; and the intended grease.
3. Approve the controlled drawing. The quotation fixes materials, hardened raceway, gear details, mounting tolerances, marking, inspection records, price and production lead time before manufacturing starts.
4. Protect the installed bearing. Mount both rings on flat, rigid flanges, tighten bolts in the approved sequence, fill the raceway with grease before service, recheck bolt torque after the first 100 operating hours and repeat at 500-hour intervals for ordinary duty. Hot, wet or dusty equipment requires shorter lubrication and inspection intervals.

A ball slewing ring is a structural rotating joint. Its inner and outer rings bolt directly to the machine base and rotating structure, so a separate shaft housing is normally unnecessary. The large center opening can also leave space for hydraulic lines, wiring or other machine services.

In the SW double-row design, hardened balls run in two raceway rows. Contact around the raceways transfers downward or upward axial force, side load and the overturning moment created by an offset boom or platform. Spacers keep adjacent balls separated, seals retain grease and limit particle entry, and grease fittings renew the lubricant film.

This structure is intended for slow, intermittent or oscillating rotation, typically no more than 10 rpm unless the selected design is specifically engineered for continuous higher-speed duty. It should not be substituted for a conventional high-speed shaft bearing solely because both products use balls.