Trace every reel, stencil print and reflow run back to the board it built.

An assembly job is won or lost on small things. A reel with the wrong resistor value. Solder paste past its jar life. A moisture-sensitive BGA left out of the bake cycle. Each one is cheap to prevent and costly once boards are reflowed, tested and packed for a customer who expects them on Friday.

Management software for assembly houses keeps the bill of materials, the reel register and the process record together by lot. Open a lot and see its reels.

A customer sends a bill of materials, Gerber and centroid files and a build quantity, and you price components, stencil and machine time against quantity breaks. You order what stores cannot supply before the build date. When parts arrive, stores check them, bake moisture-sensitive devices and kit each job in a tray with the reels counted out.

On the line, a stencil prints solder paste, the pick-and-place machine fills the board from feeders, and the reflow oven solders it. Automated optical inspection then finds missing or shifted parts. Through-hole parts go in by hand and pass over a wave or selective solder. Test operators run in-circuit or functional tests. Failures go to rework, and boards are conformally coated if needed, packed and shipped with the lot report. Short parts hold a job.