Feeder loading rests on one or two setters: HR for PCB assembly units

On a high-mix SMT line the job changes several times a day. Each changeover touches the stencil, the feeder map, the reels, the nozzles and often the reflow oven profile. One 8 mm feeder pushed into the wrong slot can place a wrong resistor value on every board in the run. In many units only one or two setters can do all of this fast and cleanly. The PCB assembly units page starts its list of strains with exactly this.

• Night-shift changeovers wait for the day setter to arrive.
• The senior setter is phoned on leave because a new board's fiducials will not register.
• Operators stand at the conveyor while the setter teaches vision and adjusts pick heights.
• Wrong-reel and polarity errors appear only when someone less experienced sets up.
• The setter's overtime tops the unit's list, month after month.

• Swapping the stencil, setting squeegee pressure and print speed, and wiping the underside before the first print.
• Building the feeder map: tape width, pitch and slot for every reel, with tantalum and diode polarity checked against the assembly drawing.
• Scanning each reel's barcode against the map, and splicing a fresh reel without losing the pocket count.
• Teaching fiducials and new package shapes to the vision system, and raising pick heights for tall electrolytics.
• Assigning nozzles so a tiny 0201 chip and a bulky connector never share the wrong tip.
• Loading the right reflow recipe and confirming conveyor width and zone temperatures.
• Pulling moisture-sensitive reels whose floor life has run out and sending them to the baking oven.

Each step is learnable. Together they take months of practice, because the setter must also judge which shortcuts are safe on a repeat board and which will bite on a new one.

A short run that waits half a shift loses its delivery slot. Line operators lose output and, where they have one, incentive. A wrong reel caught at AOI means rework at the hot-air station. One missed at AOI reaches the customer. And a lead setter who works every changeover and every Saturday is a likely resignation, taking the unit's changeover memory along.

Setting is learned by doing, and the senior does it fastest, so the senior does it. Changeover steps live in their head and a pocket notebook. Part libraries, package shapes and nozzle assignments are kept tidy by them alone. Nobody budgets the half-hour a trainee needs to load feeders slowly while the line waits. Often the role pays like a senior operator, so capable operators see little reason to take on the extra responsibility.

1. 1

   Write a changeover sheet per board family

   Stencil number, feeder map, reel list with part numbers, nozzle set, program name, oven profile and the first-board check. The senior writes it, a trainee follows it on the next changeover, and gaps go back into the sheet.

2. 2

   Kit feeders offline

   Stores or a kitting operator loads the next job's feeders onto a spare trolley while the current job runs, scanning each reel ID against the feeder map. The setter then swaps trolleys instead of loading slot by slot.

3. 3

   Put a trainee setter on each shift

   Pick an operator with steady hands and a careful habit. They change over under the senior's eye, first on repeat boards, then on new introductions.

4. 4

   Fix the first-board check

   The first board off the line is checked against the bill of materials and inspected before the run continues, signed by whoever set up.

5. 5

   Grade the role and reward the successor

   A separate setter grade carrying its own pay steps, and the senior's goals include a trainee who can change over a named board family alone.

Offline kitting usually helps most. It turns the longest part of a changeover into parallel work and lets stores share the reel checks, including moisture-sensitive parts that need baking. See how an understudy setter climbs for the training ladder, and pricing the setter grade for benchmarks against neighbouring units.

• Board families that only one setter can change over.
• How long the last five changeovers took, and who did each.
• Whether feeders are loaded on the machine or on a separate trolley.
• The senior setter's overtime and leave across the last six months.

Follow two figures for a few months: board families that at least two people can change over alone, and the senior setter's overtime. Both should move the right way. Bench quality measures, such as boards passed first time, belong in first-pass measures per bench. The electronics hub page lists the other strains SMT units carry alongside this one.