Grinding the inner hole with a bench drill
We have processed a number of taper core rods of different specifications with a taper of 1:50. We then process a batch of grinding sleeves with different specifications of inner diameter and outer diameter. We use cast iron material and saw a small groove in the circumferential direction. When in use, clamp the taper mandrel with a bench drill chuck and gently tap the grinder into the mandrel until it is inflated (as shown). In this way, hold the mold by hand, insert it into the outside of the grinding sleeve, add appropriate abrasive and appropriate amount from above.