2) should check that the grinding cracks, or prior to use.3) should check the speed of the machine suitable for grinding or not.4) should not be installed or modified by grinding was the size of the hole in the middle.5) should set the distance between the workpiece and grinding to suit should not far beyond 1 / 8. "6) should have a closing cover grinding to prevent cracking distribution of rocks. The cap should be an opening for grinding.7) cover away from the grinding should not less than ¼. "And should open the valve channel rock to the right.8) should not be used on the side of the grinding, because there may be made of broken stone.9) should be used for proper grinding with grinding materials needed10) should be used for grinding machine with good condition available.11) should be used for eye protection, respiratory, and working with caution.
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