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The centerless grinder grinding needle has a diameter of 5MM and a length of 36MM. What should I do if there are white spots on the workpiece?

1. It may be that the grinding wheel is worn, smooth it and try again. 2. This problem will also occur if the blade is worn and uneven. You can replace it with a new 4mm one. It should solve the problem. What's the problem? If you have any questions, you can also communicate with lt; China Wuxin Mo Portal gt; (temporarily unavailable) which is under construction.