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The size and tolerance standards of national standard table wheels
Published Time:
2025-06-30
Interference fit: Suitable for heavy-duty equipment, where the shaft diameter can be 0.02mm to 0.05mm larger than the inner diameter. Hydraulic equipment is required for press fitting. Clearance fit: Used in situations requiring frequent disassembly. The clearance is usually 0.1% to 0.3% of the inner diameter. For example, a car assembly line sets the inner diameter of the turntable to the shaft diameter + 0.15mm, balancing positioning accuracy and quick replacement needs.
Inner Diameter Range
The inner diameter of the turntable typically ranges from 20mm to 500mm. The specific value needs to be determined based on the application scenario:
Small equipment (such as conveyor belts): Commonly uses an inner diameter of 50mm to 80mm, adapting to standard drive shafts and fixed via keyways or set screws.
Heavy machinery (such as mining equipment): The inner diameter usually exceeds 200mm, requiring a high-strength shaft to withstand high torque.
Instruments (such as medical equipment): High precision is required for the inner diameter, with tolerance controlled within ±0.01mm to ensure smooth operation.
Tolerance and Fit
Interference fit: Suitable for heavy-duty equipment, the shaft diameter can be 0.02mm to 0.05mm larger than the inner diameter. Hydraulic equipment is needed for press fitting.
Clearance fit: Used in situations requiring frequent disassembly. The clearance is usually 0.1% to 0.3% of the inner diameter. For example, a certain automobile assembly line sets the turntable inner diameter to shaft diameter + 0.15mm, balancing positioning accuracy and quick replacement needs.
Taper fit: High-speed rotating equipment (speed > 3000 rpm) is recommended to use a 1:10 taper design to achieve self-locking, improving reliability by 40% compared to a straight hole structure.
Material Influence
Cast iron material: The inner diameter fluctuation is approximately 0.03mm/℃ when the temperature changes.
Aluminum alloy material: The coefficient of expansion is 1.5 times that of cast iron. In high-temperature environments, materials with low coefficients of expansion or pre-reserved thermal expansion and contraction gaps should be selected.
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