Usb Rechargeable Torch,Microstream Flashlight,Usb Rechargeable Flashlight,Soonfire Flashlight Ningbo Alite Lighting Technology Co.,Ltd , https://www.alite-tmwt.com A grinding wheel for grinding the inner hole of a small workpiece is usually attached to the grinding wheel rod by a small-sized screw (usually a right-handed thread). Since the screw diameter is too small, the centrifugal force generated by the grinding force and the bending of the grinding wheel rod is often too large, so that the screw is broken in the grinding wheel rod during the grinding process. There are generally two cases of breaking, as shown in Figure 1 and Figure 2.