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Fabric Design · Lecture 08
Draft, Peg Plan and Denting
From design to loom: which heald carries each end, which healds lift on each pick, and how many ends go through each reed dent.
DraftPeg planHealdsDenting
Three drawings for every weave
- Design — the point paper: ends across, picks up.
- Draft — one row per heald frame: ends that move identically go on the same heald. The number of different end movements = number of healds.
- Peg (lifting) plan — one column per heald, one row per pick: which healds rise on each pick. For a straight draft the peg plan is the design itself.
The engine on every weave page computes the draft and peg plan automatically; here they are shown for a straight-drafted twill and a pointed twill.
3/1 twill — straight draft · 8 ends × 8 picks
Draft · 4 healds
Threading order: 1 2 3 4 1 2 3 4
Lifting (peg) plan
4 healds for 8 ends: end 5 moves like end 1, so both go on heald 1. Threading 1 2 3 4 1 2 3 4.
Pointed twill — pointed draft · 6 ends × 8 picks
Draft · 4 healds
Threading order: 1 2 3 4 3 2
Lifting (peg) plan
Threading 1 2 3 4 3 2: the draft turns back, the peg plan stays a plain 2/2 twill.
Denting
Ends are drawn through the reed in groups — 2, 3 or 4 per dent — chosen so that the group matches the weave repeat (or divides it) and the ends in a dent are not all lifting together, which would leave reed marks.
| Weave | Ends per dent | Why |
|---|---|---|
| Plain 1/1 | 2 | one up, one down in each dent |
| 2/1 twill | 3 | whole repeat per dent |
| 3/1 twill, 2/2 twill | 4 | whole repeat per dent |
| 5-end satin | 2, 3 alternately (2.5 avg) | repeat does not divide by 2 or 4 |
Reed count then follows from EPI ÷ ends per dent (Weaving Calculations 11).