Board Support Fixture Control in SMT Assembly: 5 Rules Board support holds a panel flat while it is printed, placed and reflowed. Without it the panel bends under the squeegee, the placement head and its own weight, and the bending changes the deposit volume and the placement height. The requirement…

Cleanliness Test Selection for PCB Assemblies: 5 Rules Cleanliness is one of the few process outputs that cannot be judged reliably by looking at the board. A residue that is invisible under the microscope can hold enough ionic material to corrode a fine pitch circuit in service. A visible mark,…

Placement Nozzle Control on SMT Machines: 6 Rules A placement nozzle has to pick a component from the feeder, hold it while the head travels and seat it on the pad. It is the only interface between the machine and the part, and its condition sets the accuracy that the…

Step Stencil Control for Mixed Paste Volumes: 6 Rules A step stencil carries two or more thicknesses in one sheet, so a heavy deposit can be printed on a power pad while a fine pitch area receives a thin one. It removes the compromise that a single thickness forces on…

PCB Breakaway Tab Plan: Process Details and Inspection Points Buyers and engineers often focus on the finished product and forget the production line behind it. In practice, most field failures can be traced back to process decisions made during assembly. Understanding PCB breakaway tab plan gives you a practical advantage…

PCB Impedance Coupon Traceability: Process Details and Inspection Points Electronics manufacturing has become a discipline of small details. Solder paste volumes, placement accuracy, temperature profiles and inspection limits all add up to the final result. This guide looks at PCB impedance coupon traceability from the perspective of a PCBA factory…

Convection Airflow Balance in the Reflow Oven Convection airflow is the mechanism that carries heat from the heater bank to the board, and its balance across the tunnel decides whether two identical boards processed side by side receive the same thermal profile. An oven can hold its set points perfectly…

PCB Breakaway Tab Data: A Practical Review for Manufacturing Teams Electronics manufacturing has become a discipline of small details. Solder paste volumes, placement accuracy, temperature profiles and inspection limits all add up to the final result. This guide looks at PCB breakaway tab data from the perspective of a PCBA…

PCB Breakaway Tab Limits: Where the Edges Are Breakaway tabs look like scrap material until a router bit reaches them. The tab holds a small board inside its panel during assembly, then must release cleanly at depanelization. Where the tab edges sit decides how much stress the laminate takes and…

AOI Teaching Samples and Program Representativeness AOI teaching is the step in which the inspection program learns what an acceptable joint, fillet and component body look like on a specific product, and it decides how the machine behaves for every board that follows. A program taught on one board from…