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| Rolling Body: | Roller Bearings |
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Overview
A Lazy Susan Bearing, also known as a turntable bearing or rotary platform bearing, is a specialized type of bearing designed to enable smooth, low-friction rotation around a vertical axis for a horizontal platform. Unlike bearings designed for high-speed shafts, these are engineered to support substantial axial (thrust) loads and handle moderate moment (tilting) loads, making them the perfect solution for a vast range of rotational applications, from heavy industrial workstations to everyday household items.
Key Characteristics & Design Features:
Axial Thrust Load Capacity: Their primary function is to support weight pressing directly downward onto the platform, such as a heavy microwave, a restaurant turntable full of food, or industrial components.
Low-Friction Rotation: Utilizes either rolling elements (balls or rollers) or low-friction polymers to allow easy rotation with minimal effort.
Compact, Integrated Design: Often comes as a complete, self-contained unit that is easy to install between two surfaces.
Moment Load Resistance: Robust designs can handle off-center loads that create a tipping force, preventing the platform from binding.
Variety of Sizes and Load Ratings: Available in small sizes for cabinetry (a few inches in diameter) to very large diameters (several feet) for industrial turntables.
Common Types of Lazy Susan Bearings:
Ball Bearing Turntables: The most common type. Features a race of ball bearings contained between two steel rings. They offer an excellent balance of smooth operation, load capacity, and cost-effectiveness.
Example Models: Often generic sizes like 4SB20 (4" diameter, 20-ball) or 12SB100 (12" diameter, 100-ball). Manufacturers may have proprietary codes.
Roller Bearing Turntables: Use cylindrical rollers instead of balls. Ideal for very heavy loads and higher moment loads, as they provide greater stability and resistance to tipping. Common in heavy industrial applications.
Slew(ing) Ring Bearings: Large-diameter, heavy-duty turntable bearings that can handle extreme combined loads (axial, radial, and moment). They often have internal gear teeth for motorized rotation.
Example Models: 011.30.400 (a common model number format indicating inner/outer diameter and height specifications).
Plain Bearing / Polymer Turntables: Use a low-friction polymer or bronze interface instead of rolling elements. Best for lighter-duty, low-speed applications where cost is a primary driver and ultimate smoothness is less critical.
Primary Applications:
Household: Microwave ovens, kitchen cabinet storage trays, revolving snack trays, rotating bookshelves.
Commercial: Restaurant serving turntables (a true "Lazy Susan"), display stands for merchandise, hotel buffet lines.
Industrial: Assembly workstations (e.g., welding jigs), robotic rotary axes, packaging machinery, inspection tables, medical imaging equipment (e.g., CT scanner bases).
Aerospace & Defense: Radar antenna platforms, gun turrets.
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