SMT Auto Placement

Category: Surface Mount

Description: SMT Auto Placement is the process of installing Surface Mount (SMT) components on the surface of the PCB by machine. (See also: SMT Hand Placement)

Major Cost Drivers -- PCBA SMT Auto Placement

The Device Placement Time shown below is somewhat oversimplified. The cost model takes into account whether this is the top side or bottom side of the board, as well as different categories of components and their specific deposition rates.

Process Time = Travel Time + Load Time +
Fiducial Check Time + Device Placement Time + Unload Time

  • Travel Time = Shuttle Conveyor Time + Transport Conveyor Time
    • Shuttle Conveyor Time = Shuttle Conveyor Length/Shuttle Conveyor Speed
      • Shuttle Conveyor Length = (Machine variable)
      • Shuttle Conveyor Speed = (Machine variable)
    • Transport Conveyor Time = (Transport Conveyor Length/Transport Conveyor Speed)* Transport Conveyor Quantity
      • Transport Conveyor Length = (Machine variable)
      • Transport Conveyor Speed = (Machine variable)
      • Transport Conveyor Quantity = (Machine variable)
  • Load Time = Machine Load Time*Machine Quantity
    • Machine Load Time = (Machine variable)
    • Machine Quantity = (Machine variable)
    • Fiducial Check Time =(Machine variable)*Machine Quantity
    • Device Placement Time = Quantity Component Type/Component Type Disposition Rate
    • Unload Time = (Machine variable)*Machine Quantity

User Inputs –- PCBA SMT Auto Placement

PSO: Fixture Requirements override. (Adds fixture load / unload time to Machine Load / Unload time if  true.)