Solder For Household Electrical Appliances Solder For Household Electrical Appliances,Economical Solder Wire Rosin,Solder Repairing Electrical Equipment,Leaded Welding Wire Pen Tube NINGBO XIHAN TIN SOLDER CO.,LTD. , https://www.soldertop.com When grinding requires a higher outer circle of the workpiece (Fig. 1), we used a double-cone end-expanding mandrel with low efficiency. To this end, we designed a four-cone elastic expansion mandrel. The two elastic expansion sleeves 3, 8 (Fig. 2) with tapered surfaces cooperate with the tapered surfaces of the mandrel body 1, the double cone 5, and the outer sleeve 10, respectively, and are assembled as shown. As long as it is used in the forward rotation