mathew.skerritt
Bottom Bracket Mold
The bottom bracket is a four-piece mold due to its geometric complexity. This mold connects the seat tube and dropouts. This mold corresponds to FR 2.1.3, FR 2.3.3, FR 2.3.5, and FR 3.1.1. In the center of the mold the bottom bracket cylinder lays with both ends sealed to enable the pedals to enter and rotate. The bottom bracket requires four molds because four bamboo tubes enter this mold. The holes on the top surface of the top mold as indicated in the figure were the locations where the bolts would secure both molds together as shown in FR 3.1.1.
Bottom Bracket Mold
The bottom bracket is a four-piece mold due to its geometric complexity. This mold connects the seat tube and dropouts. This mold corresponds to FR 2.1.3, FR 2.3.3, FR 2.3.5, and FR 3.1.1. In the center of the mold the bottom bracket cylinder lays with both ends sealed to enable the pedals to enter and rotate. The bottom bracket requires four molds because four bamboo tubes enter this mold. The holes on the top surface of the top mold as indicated in the figure were the locations where the bolts would secure both molds together as shown in FR 3.1.1.