Shower Elbow,Shower Outlet Elbow,Shower Head Elbow,Shower Elbow Fitting Kaiping Rainparty Sanitary Ware Technology Co.,Ltd. , https://www.helin-shower.com Our factory processes a high-precision inner hole with a small roundness tolerance (0.001mm), a surface roughness of Ra0.08, and a tapered hole. To this end, we designed and manufactured the grinding hole fixture, which adopts the central frame positioning and the spindle rotation scheme (that is, the grinding machine spindle only plays the rotating role). The high-precision spindle 12 (figure) is positioned by six adjustment screws 14 (bakelite ends) so that there are two sets of center frames. The accuracy of the spindle 12 directly affects the accuracy of the machined parts, so