An Injection mould has 8 cavities as shown in below Figure.

An Injection mould has 8 cavities as shown in below Figure. Knowing that the mould is designed so that all cavities must be filled at the same time, the runners the different sections must have differAn Injection mould has 8 cavities as shown in below Figure. Knowing that the mould is designed so that all cavities must be filled at the same time, the runners the different sections must have different Diameters. This is done using the pressure drop in a section that is calculated using the following equation DP /(pD4). If the cavities are equally separated (160mm) and the diameter of runner 1 is 8 mm and of runner 2 is 16.5 mm, then find the diameter of runner 3.

Suggest modification engineering drawing on the design of the cavity distribution compared to the sprue.