Tightly controlled drum systems maintain constant tangential speed

https://www.newsbreak.com/dmr-news-321522575/4524631068041-artnet-pro-sets-the-standard-in-high-resolution-pcb-photoplotting-for-aerospace-and-advanced-electronics

Tightly controlled drum systems maintain constant tangential speed, reducing stitching errors; some flatbeds use interferometric feedback to guarantee alignment of fiducials across multi-up panelized arrays.