Wheel Balancer calibration method

Wheel balancer calibration methods vary depending on the device type and application scenario. The following are some common calibration methods.
Before calibration, it is necessary to thoroughly inspect the wheel balancer, including any external damage, ensuring that all components are securely connected, and ensuring that the sensors are functioning properly.

1.Spindle Runout Calibration

• Axial Circular Runout Calibration: Install a dial indicator so that the contact contacts the spindle's axial locating disc. Adjust the dial indicator pointer and rotate the spindle one full revolution. Record the change in the percentage displayed value (maximum value - minimum value). The minimum value should be less than 0.05mm.
• Radial Circular Runout Calibration: Install a dial indicator so that the contact contacts the spindle. Adjust the pointer and rotate the spindle one full revolution. Record the change in the percentage displayed value. The minimum value should be less than 0.05mm.

2.Special Caliper Calibration

• Use a steel ruler to calibrate the caliper at three points: 50.8mm, 152.4mm, and 254mm. Record the difference between the result and the caliper length. The tolerance is ±0.5mm.

3.Wheel Gauge Calibration

• Select three calibration points within the full range of the wheel gauge. Use a steel ruler to calibrate, and record the difference between the result and the wheel gauge reading.

4.Calibration for Minimum Residual Unbalance (EMA)

• Select a calibration rotor with a mass less than one-third of the maximum mass allowed by the balancing machine. Calculate the test weight, clamp the rotor to the spindle, and balance it to a height of less than 1.0 m. Simultaneously apply a test weight to the non-calibrated surface of the calibration rotor, start balancing until it is less than 1.0 m, and record the results. If the target value is still not met after multiple balancing attempts, record the EM value and terminate the calibration.

5. Separation Ratio Calibration

• Place a test weight on the calibration rotor's calibration surface, start the balancing machine, record the reading, and calculate the separation ratio. The separation ratio must be no less than 1:8.

6.Repeated Clamping Error Calibration

• Balance the calibration rotor until the residual unbalance is less than 1.0m and record the reading. Rotate the rotor, re-clamp it, and balance again. Record the reading and the difference between the two readings. The error must not exceed 1.5 emar.

7.Repeatability Error Calibration

• Place the test weight in the screw hole on the calibration rotor's calibration surface. Repeat the balancing machine four times. Record the reading and the difference between the maximum and minimum readings. The error must not exceed 0.3 emar.

8.Phase Error Calibration

• Place the test weight on the calibration rotor's calibration surface, start the balancing machine, and record the phase reading. Repeat this operation at 90° intervals. Record the difference between the phase value and the theoretical phase value. The tolerance is ±15°.

Does a wheel balancer need to be calibrated?

Required

Wheel balancers require calibration. The primary purpose of calibration is to ensure the accuracy and reliability of measurement results, improve equipment precision, extend service life, and reduce maintenance costs. The following are specific reasons and methods for calibration:

1. Accuracy: Over extended use, the balancing machine's data may exhibit errors, leading to inaccurate measurements. For example, even after a tire is dynamically balanced on an uncalibrated balancing machine, the vehicle may still experience vibrations while driving.
2. Precision: Calibration enables the balancing machine to more accurately detect minute imbalances, providing more accurate data for optimizing equipment adjustments.
3. Service Life: Proper calibration helps reduce excessive wear and failures caused by inaccurate measurements, thereby extending the life of the balancing machine.