Most register complaints are not machine faults — they are setup habits. Four disciplines keep colour-to-colour fit where the specification says it should be.
Start from the pin bar, every time
Register begins at plate mounting, not at the running press. Plates punched and mounted against the pin bar start within a hair of position; plates eyeballed onto the clamp start wherever they land, and the press spends the first hundred sheets paying for it. Mount to the pins, torque the clamps in sequence, and the console corrections stay small.
Change one thing, then look
Chasing register with simultaneous lateral, circumferential and cocking moves turns a two-minute correction into a twenty-minute spiral. Move one axis, pull a sheet, read the marks with the glass. The micrometer scales on the machine are honest; three corrections in flight at once are not readable by anyone.
Respect the paper’s opinion
Sheet-to-sheet misregister that wanders with no pattern is usually the stock, not the press: grain direction fighting the fold, moisture picked up overnight, or a pile cut from two batches. Check the pile before loosening a single machine bolt — the press can only register what the sheet repeats.
Log the settings that worked
A register setup that survived a full run is worth writing down: packing thicknesses, console trims, stock batch. The next run of the same job should start from that record. Presses do not forget — but pressrooms do, every time the shift changes.
