Draft Plans and Heddle Threading Sequences
topic
Draft plans specify the assignment of each warp end to a specific heddle shaft according to the weave repeat, with straight draft threading end 1 to shaft 1, end 2 to shaft 2 in sequence for simple twills, skip draft creating pattern variations by non-sequential shaft assignments, and grouped draft concentrating specific yarn types on dedicated shafts for complex fabric constructions, with the draft being the fundamental design parameter that determines what weave structures the loom can produce with its shaft count.
Role
Encodes the weave structure in the physical threading arrangement that determines which warp ends will be raised or lowered together during shedding, with draft design being the foundational fabric engineering decision that governs the weave repeat size, the maximum achievable pattern complexity for a given shaft count, and the balance of mechanical forces across the shed that affects warp break rate and fabric quality in ways that cannot be corrected after drawing-in without complete re-threading.