The specific parameters of a ball transfer unit include dimensional parameters, load-bearing capacity parameters, material parameters, precision parameters, and more. A detailed breakdown is provided below:
Dimensional Parameters
Ball Diameter: Common sizes include 15mm, 25.4mm, 50mm, etc. For instance, the steel ball diameter of Huzhou Dingshun's WB-02 ball transfer unit is 25.4mm.
Overall Dimensions: Includes the overall length, width, and height. For example, the WB-02 ball transfer unit has an overall length of 70mm, a width of 55mm, and a total height of 32mm.
Mounting Hole Dimensions: Such as mounting hole spacing and hole diameter. The WB-02 ball transfer unit features a mounting hole spacing of 56mm and a hole diameter of 5.5mm.
Load-Bearing Capacity Parameters
Static Load: Refers to the maximum load the ball transfer unit can withstand while in a stationary state. Different models have different static load capacities; for instance, the WB-02 unit has a static load capacity of 35kg, whereas FREEBEAR's S-5L-MF unit has a static load capacity of 60kg.
Dynamic Load: Refers to the maximum load the ball transfer unit can withstand while in motion. This value is generally lower than the static load; for example, the WB-02 unit has a dynamic load capacity of 45kg.
Material Parameters
Housing Material: Common materials include zinc-plated carbon steel, stainless steel, reinforced nylon, etc.
Ball Material: Options include carbon steel balls, zinc-plated carbon steel balls, bearing steel balls, plastic-steel balls, etc.
Precision Parameters
Polishing Precision: Generally required to reach 0.01mm to ensure a friction coefficient of ≤0.5.
Ball Roundness Error: Must be controlled within ±0.005mm to prevent operational vibration or wobbling.
Other Parameters
Weight: For example, the WB-02 ball transfer unit weighs 150g, while the S-5L-MF unit has a self-weight of 138g.
Friction Coefficient: High-quality ball transfer units feature a low friction coefficient, allowing for easier movement of loads. For instance, the S-5L-MF unit-when equipped with MF seals-exhibits a lower friction coefficient compared to products utilizing conventional rubber seals. Sealing Performance: Some ball transfer units feature sealing capabilities that prevent the ingress of dirt and foreign matter; for instance, the WA-02 model is equipped with an internal nylon seal that effectively guards against dust.