Reason 1 The use of the tool itself does not match the machine settings, to be adjusted. Solution: adjust the speed and speed ratio (generally transferred to about 10: 1) made when the domestic machine to reduce the rotational speed when appropriate 2 processing material excellent. Solution: It is recommended to use a coating or PCD blade. That is, the center of gravity offset, so the rotation of a larger centrifugal force resulting in vibration when rotating more than double-edged tools, solution: to reduce the gripper position that is to be shortened to the bottom of the chuck exposed length. 2 crankshaft chuck grasping knife instability, resulting in vibration.