Using the DELTA 25-inch grinder is easy. First, make sure it's connected to a 220v power source. If you want dustless operation, connect it to Vac 3. You can adjust the speed between 300 - 1800 RPM according to your needs. The locking adjustment handle makes it simple to set up the grinding heads. When using it, keep an eye on the 7-gallon water tank and refill it when needed. After use, clean the grinder, especially the dust shroud and grinding heads. Store it in a dry place. And don't forget to check the tool kit in the built-in toolbox regularly for any missing tools.