• Wear of a grinding wheel in a polishing machine is one of the reasons to reduce accuracy of product finish. Today, quality is controlled by the number of processed times and time, and periodical maintenance is performed even though a grinding wheel can be still used. However, there is a possibility to produce defective one if unusual wear occurs for any reason. For cost reduction, a company wants to use grinding wheel effectively until the end of its life. In this example, The VC-2200 monitors constantly and detects abnormal vibration to find imbalance caused from wear by a sensor (magnetic attachable/removal) mounted on a measurement object. This application achieves a reduction of maintenance cost and improves product quality.
   
• The VC-2200 can be set up two frequency bands and make Pass/Fail judgment based on rms and peak factor value on each band. Also it has effective functions such as the comparator delay time setup function and auto operation function. The comparator delay time setup function removes unwanted signal at the time of starting measurement and the automatic operation function can control the timing of judgment by inputting a control signal from external device such as PLC*.
   
• By connecting a pair of commercially sold headphones to the VC-2200, it is possible to make hearing check of vibrating sound. Moreover, it can be used instead of conventional stethoscopic probe. Output signals are provided for each band, enabling an observation for vibration phenomenon on each frequency band.

nThe operation control panel in the above figure which the VC-2200 is built-in is prepared by customer.
* PLC: Programmable Logic Controller