electrostatic rotarybellspray guns undergone dynamic balancing?

Have all the main parts of Hongda's electrostatic rotary bell spray guns undergone dynamic balancing?

Not all main components of Hongda electrostatic rotary bell spray guns are dynamically balanced; strict dynamic balancing is only performed on the high-speed rotating core parts.

- Parts that must be dynamically balanced: the rotary cup (atomizingbell cup) and the turbine rotor shaft directly connected to it. These parts can reach speeds of 30,000–70,000 rpm, and if unbalanced, they can cause severe vibrations, affect atomization, and damage air bearings.

- Parts not dynamically balanced: gun body shell, high-voltage generator, paint lines, electrostatic generator, and other stationary or low-speed components do not require and do not undergo dynamic balancing.

Industry standards and Hongda product specifications indicate that dynamic balancing is a key quality inspection step for the rotary bell  assembly before leaving the factory, but only for the rotating assembly. For confirmation of specific models (like the HDA-50/60 series), refer to the product details.

The dynamic balance grade (G value) is a common indicator used to measure the residual imbalance of rotating parts. The smaller the G value, the higher the balancing precision and the smaller the residual vibration amplitude. Below is a table showing the industry standard relationship between dynamic balance grade (G value) and allowable vibration displacement, suitable for Hongda electrostatic rotary cup spray guns with rotating parts up to 70,000 rpm:

| Dynamic Balance Grade (G value) | Allowable Vibration Displacement at 60,000 rpm (μm) | Allowable Vibration Displacement at 70,000 rpm (μm) | Application Scenario |

|---------------------------------|---------------------------------------------------|---------------------------------------------------|--------------------|

| G 0.4                           | <2.0 | <1.7 | High-precision, ultra-high-speed rotary cup (high-end automated spraying lines) |

| G 1.0                           | <5.0 | <4.3 | Standard high-speed rotary cup (standard Hongda product precision requirement) |

| G 2.5                           | <12.6 | <10.8 | Medium to low-speed general-purpose rotary cup (low-speed spraying scenarios) |

| G 6.3                           | <31.8 | <27.3 | Non-core rotating auxiliary parts |

It should be noted that the above is a general industry conversion standard. As a professional rotary bell spray gun manufacturer, Hongda’s default requirement for the factory dynamic balancing accuracy of core rotarybellparts is G 1.0 or better, ensuring low vibration and uniform atomization during high-speed spraying. For specific product parameters, you can also refer to the product inspection report or consult the manufacturer for confirmation.