Braider Bobbin Depletion, Doff Interval & Effective Output

Packing density is the input that decides the answer and the one nobody measures: a published bobbin volume is the space available, and how much yarn occupies it depends on the winding, the yarn and how hard it was laid on. Weigh a full bobbin and an empty one from the machine in question rather than taking a number from a handbook, because the difference between 0.45 and 0.65 g per ccm is a third of the run time. The model assumes every carrier carries a full bobbin of the same yarn and empties together, which is what a single-yarn braid does; a braid running two counts, or one where a broken end was replaced mid-run, empties unevenly and the first bobbin to run out sets the stop. Doffs per shift is left as a fraction on purpose - rounding it up assumes a change that starts before the shift ends also finishes inside it, and rounding it down hides a stop that has to happen. The change time should be measured from the last running minute to the next one, including threading and the restart, not from the operator arriving. Nothing here accounts for a bobbin taken off part-full at a shift change or a product change, which on a short-run job can matter more than depletion ever does.