Description: The PCB load process is the automated feeding of the assembly line by using a Bare Board Unstacker, or equivalent machine. A stack of bare PCBs is loaded into a magazine or directly onto the unstacker, depending on the specific unstacker model. A plunger may push the PCB into the line, or the PCB may drop from the stack onto the conveyor.

PCB Load Cycle Time is the sum of time to unload the PCB from the stack of PCBs (Unstacker Time), the time to transport across the length of the unstacker machine (Transport Time ), and the time to reload the unstacker with a stack of PCBs (Reload Unstacker Time). Note that there is a weight and height limit of the stack that the machine can accept, therefore the Cost Model must look for the lowest integer between the maximum capacity based on height and the maximum capacity based on weight. Based on this capacity, we can determine how many times per batch the reload will need to happen and we distribute this time evenly across the batch, assuming that the impact of this time is only required to determine costing and is not critical to determine line balancing.

// Process Time for PCB unstacker to feed SMT line.

// Time for one PCB to unstack.

// Transport time through inspection station.

// Time to reload stacker.

Process specific: N/A

Global Inputs: PCB Length, PCB Width, PCB Thickness, PCB Weight.