cutting grooves(键槽) a)fix the Vertical the grooves should meet 4 position,trim Milling File(锉刀) the ming(划线) machine specifications good b)mill using (立式铣床) enough verticle milling machine the screwdrive 5 connecting the r(螺刀) boards /strong adhensive Detailed procedures of manufacturing: 1.Cut off the boards needed from the whole aluminum-plastic plate The parameters of the boards needed:(mm) Size number machining allowance 180*35 #4 machining allowance:54 cutting grooves(键槽) a)fix the position ,trim ming(划线) b)mill using verticle milling machine Vertical Milling machine （立式铣床） File(锉刀) the grooves should meet the specifications good enough 5 connecting the boards the screwdrive r(螺刀) /strong adhensive Detailed procedures of manufacturing: 1. Cut off the boards needed from the whole aluminum-plastic plate. The parameters of the boards needed: (mm) Size number machining allowance 180*35 #4 machining allowance:5