Eccentricity measurement of disk plate

The challenge

Although a relatively simple component the brake disk has many features that require tight control. The disk faces should be parallel to one another and in turn parallel to the wheel face mount as well as having no extreme changes in thickness variation. Brake surfaces should also be flat and square to the axis of the disk's rotation to a specified tolerance.

The customer was measuring the eccentricity of the disk with a contact sensor. When using this sensor the surface was damaged occasionally, which caused defective goods that had to be rejected.

Required accuracy:

• Tolerance: +/-40 micro meter
• Resolution: +/-10 micro meter

The solution

To measure the eccentricity the disk is set up in the turntable and the sensor is mounted at the upper point. In this application a laser displacement sensor is used with a sensor head and controller.

Added value

The benefits for the customer are that product quality has stabilized and productivity has improved by continuously checking eccentricity data with the logging function of "Smart Monitor Zero”.