Precision Assembly: KET Automatic Matching & Ball Loading

In the world of precision miniature bearings, the grinding process shapes the steel, and the washing line purifies it. However, it is the assembly process that truly determines the bearing's final performance. At Ningbo Kexiang Bearing Technology Co., Ltd. (KET), we rely on a state-of-the-art Automatic Assembly Line to bring our components together with zero margin for error.

To produce up to 100 million precision bearing sets annually, manual assembly is not an option. The secret to our unwavering consistency lies in mastering Radial Internal Clearance —the total distance that one bearing ring can be displaced relative to the other in the radial direction. To achieve this, KET utilizes two highly specialized robotic systems.

The Automatic Matching / Mating Machine

Even with micron-level grinding precision, micro-tolerances will naturally exist between different batches of inner and outer rings. If you blindly assemble an inner ring, an outer ring, and standard-sized balls, the resulting clearance will vary, leading to vibration and premature wear.

Our Automatic Matching Machine solves this by using intelligent algorithms and real-time metrology:

• Precision Measurement: As the inner and outer rings enter the machine, highly sensitive probes automatically measure the exact actual dimensions of the inner and outer raceways (grooves).
• Smart Calculation: The machine's computer instantly processes these dimensions and calculates the exact ball diameter required to achieve the target internal clearance.
• Dynamic Mating: Based on the calculation, the machine automatically pairs the specific inner ring, outer ring, and the precise grade of steel balls required for a perfect match.

The Automatic Ball Loading Machine

Once the components are perfectly matched by the mating machine, they immediately move to the Automatic Ball Loading Machine.

This automated equipment handles the delicate process of inserting the rolling elements:

• Eccentric Displacement: The machine automatically offsets the inner ring so that it touches the outer ring on one side, creating a crescent-shaped gap on the opposite side.
• High-Speed Insertion: The exact number of pre-calculated, matched steel balls are automatically fed and loaded into this gap at high speed.
• Centering & Distribution: The inner ring is then snapped back into the center, and the balls are evenly distributed around the raceway, ready for the retainer (cage) to be installed.

Why Precise Clearance Matters to Our B2B Partners

For buyers utilizing KET bearings in UAV motors, financial instruments, or medical equipment, proper clearance is non-negotiable. Our automated matching and loading process guarantees:

• Optimized Load Distribution: Perfect clearance ensures that loads are distributed evenly across the rolling elements, preventing localized stress and metal fatigue.
• Temperature Control: Bearings with correct clearance generate less friction, significantly reducing heat buildup at high rotational speeds.
• Acoustic Excellence: By automatically mating the perfect balls to the raceways, KET effectively eliminates the internal rattling or "tightness" that causes abnormal noise.

By automating the most critical phase of bearing assembly, KET ensures that every single unit in a massive production run performs exactly as engineered.