Production lines and methods for ceramic shell making

A production line for ceramic shell making, comprising:

• a conveyor chain system configured to convey a batch of modules;
• a robotic arm configured to remove and replace one or more modules among the batch of modules relative to the conveyor chain system and hold the one or more modules during a plurality of subsequent operations, the robotic arm being configured to be moveable to a plurality of positions each of which corresponds to one of a plurality of stations;
• a slurry coating device configured to coat the one or more modules in slurry;
• a sanding device configured to sand the one or more modules, the sanding device including a plurality of sanding machines;
• and
• a control center, wherein
• the control center is operably connected with the conveyor chain system and the robotic arm, respectively, to cause, based on a first instruction, the conveyor chain system and the robotic arm to cooperate with each other;
• and
• the control center is operably connected with the sanding device to cause, based on a second instruction, a sanding machine including a corresponding type of sand to move to a second designated position.