On the machine in the room
We use a laser engraver. Some workshops are quiet about that. The reason we are not is that the tool is not the standard — the tolerance is. A hand-cut line and a laser-cut line are held to the same requirement: it must be right at the depth, right at the scale, and still right when the object has darkened around it in five years.
What the machine genuinely changes is repeatability across a run of commissioned pieces. Forty coins carrying the same mark should carry the same mark. That is a job a machine does honestly and a hand does not.
What we reject
Roughly one piece in twelve does not leave the bench. Most failures are engraving depth, a small number are finishing marks that only show in daylight, and occasionally a material fault that was invisible in the stock. Rejected pieces are not sold as seconds.