Floor Heating Solid,Modern Minimalist Floor,Light Luxury Style Floor,Solid Wood Flooring TECLIC , https://www.teclicfloors.com Our workshop received a number of plunger parts with a precision ball and socket structure (Figure 1). The plunger is a key component of the steel ball rolling motor, and the accuracy of the ball socket will directly affect the efficiency of the whole machine. The material of the parts is aluminum bronze QA19—4. In addition to the dimensional accuracy and surface roughness requirements, the technical requirements indicate that the 0-level steel ball coloring inspection (with 0 class steel ball tolerances within 0.001mm), the contact surface is above 80%. , color breaks are not allowed along the circumference.