AI Skill Report Card
Converting Weaving Drafts
Quick Start14 / 15
A weaving draft has four parts: threading (how warp threads go through heddles on shafts), tie-up (which shafts each treadle pulls), treadling (the pedal sequence), and drawdown (resulting fabric pattern). Most conversions manipulate the relationship between these four parts.
Identify which conversion is needed first:
| Need | Conversion |
|---|---|
| Change pattern orientation / reduce shuttles | Turn the draft (rotate 90°) |
| Weave a floor-loom draft on a table loom | Tie-up → lift plan |
| Draft looks inverted (pattern on wrong side) | Sinking ↔ rising shed tie-up flip |
| Only have fewer shafts than the draft calls for | Shaft reduction |
| Have a profile draft (block shorthand) | Profile → threading expansion |
| Want to weave multi-shaft draft on rigid heddle | Heddle/pickup-stick mapping |
| Want doubleweave or double-width | Shaft doubling + draft splitting |
| Have a paper/photo draft | Digitize into WIF |
Recommendation▾
Add 1-2 more concrete examples covering less common conversions (e.g., profile draft expansion or rigid heddle mapping) to balance the current turning/reduction/tie-up focus
Workflow14 / 15
Progress:
- Identify the specific conversion type needed (table above)
- Confirm loom type and shed mechanism (rising, sinking, countermarche, table, rigid heddle)
- Confirm available shaft/treadle/lever count
- Perform the conversion
- Verify by checking the drawdown matches intended fabric face and structure
1. Turning a Draft (rotate 90°)
- Rotate the entire draft (threading, tie-up, treadling) 90° — conventionally counterclockwise.
- Original threading becomes the new treadling; original treadling becomes the new threading.
- The tie-up must also rotate/invert: transpose the tie-up grid (swap rows and columns), not just reuse the original.
- Use when: reducing shuttle count, changing fabric orientation, or simplifying a complex treadling into threading.
2. Floor Loom → Table Loom (tie-up → lift plan)
- Table looms have no treadles tying multiple shafts together; each pick requires manually lifting specific levers.
- For each treadling pick, look up which shafts that treadle's tie-up column lifts, and list those shaft numbers directly as the lift plan for that pick.
- Replace the tie-up box + treadling sequence with a single lift-plan column reading shaft numbers per pick.
3. Sinking ↔ Rising Shed / Countermarche Tie-Up Conversion
- If cloth face is showing the design on the wrong side, the tie-up needs flipping.
- Rising ↔ sinking: invert every mark in the tie-up grid (X becomes blank, blank becomes X).
- Countermarche: requires both the X's (lift) and O's (sink) marked explicitly — combine the rising-shed tie-up X's and sinking-shed O's into one tie-up with two symbols.
4. Shaft Reduction (downsizing)
- Direct mathematical reduction only works for simple twills: map shafts 5–8 threading down onto shafts 1–4 (repeat the pattern).
- For complex multi-block or high-shaft drafts (e.g., 14→8→4 shafts): preserve the silhouette (the peaks/valleys shape of the threading progression) rather than exact float-length ratios. Compress steep sections proportionally.
- Hard limits: some structure combinations (e.g., 4-end twill + plain weave) need a minimum shaft count (often 6) and cannot be cleanly reduced further. Satins and many block weaves don't reduce to 4 shafts at all — recommend a different draft instead of forcing it.
5. Profile Draft → Threading Draft
- A profile draft uses blocks (A, B, C…) as shorthand instead of individual shaft assignments.
- Choose a weave structure to substitute into each block (e.g., Bronson lace, huck, overshot).
- Expand each block letter into its corresponding multi-shaft threading repeat for the chosen structure.
- Derive tie-up and treadling/lift plan from the expanded structure, not the original profile shorthand.
6. Rigid Heddle / Pickup Stick Mapping
- 3-shaft draft → 1 heddle + pickup stick: chart which threads sit in heddle holes/slots vs. on the pickup stick to simulate the third shaft.
- 4-shaft draft → 3 heddles: use empty slots across the three heddles to simulate the missing fourth shaft's "down" positions.
- Map shaft-by-shaft, thread-by-thread; there's no shortcut formula — build a chart matching original shaft assignment to heddle/stick position.
7. Doubleweave / Double-Width Conversion
- Double the shaft count (e.g., 4→8).
- Split the original draft in half: write the first half of threading on shafts 1–4 (leaving gaps for the second layer), and the second half on shafts 5–8, often threaded in reverse order.
- Tie-up and treadling must address both layers per pick (one shuttle per layer, or shared shuttle alternating).
8. Digitizing a Paper/Photo Draft
- Manually transcribe threading, tie-up, and treadling grids into weaving software (e.g., WIF-compatible tools) cell by cell.
- Verify by generating the drawdown from entered data and visually comparing it to the source image.
- Export as .WIF for interchange between software, and PDF for printing.
Recommendation▾
Example 1's 'special case' note is good but could show a non-trivial transposed tie-up example where rows/columns actually differ to fully demonstrate the technique
Examples16 / 20
Example 1 — Turning a draft: Input: 4-shaft point twill threading (1,2,3,4,3,2,1,2,3,4,3,2) with treadling 1,2,3,4 repeat, straight tie-up (treadle 1→shaft1, etc.) Output: New threading = old treadling sequence (1,2,3,4 repeat). New treadling = old threading sequence (1,2,3,4,3,2,1,2,3,4,3,2). Tie-up transposed (rows/columns swapped) — since original was straight/diagonal, transposed tie-up is identical in this special case, but must be explicitly re-derived, not assumed.
Example 2 — Shaft reduction: Input: 8-shaft straight twill threading 1-2-3-4-5-6-7-8 repeat, need to weave on a 4-shaft loom. Output: Reduce to 1-2-3-4 repeat (fold shafts 5-8 onto 1-4). Note to weaver: float lengths and diagonal steepness will differ slightly from the 8-shaft original; this is an approximation, not an identical structure.
Example 3 — Sinking to rising shed: Input: Tie-up for sinking-shed loom shows X marks where shafts should NOT lift. Output: Invert every cell — all X become blank and all blank become X — producing a rising-shed tie-up where X marks shafts that DO lift.
Recommendation▾
Consider adding a brief note on how to verify WIF file correctness after digitizing, since that's a distinct deliverable format mentioned but not elaborated on
Best Practices
- Always re-derive the tie-up explicitly when turning a draft — never assume it stays the same unless the original tie-up is symmetric (e.g., straight draw).
- When reducing shafts, warn the weaver that the result approximates, not replicates, the original fabric — especially for satins, block weaves, and combined structures.
- For table loom conversions, double-check shaft count against the number of available levers before committing.
- When expanding profile drafts, pick a structure appropriate to the intended sett and yarn (lace structures need different setts than twills).
- Always regenerate and visually inspect the drawdown after any conversion — it's the fastest way to catch tie-up or threading transcription errors.
Common Pitfalls
- Forgetting to transpose/invert the tie-up when turning a draft (reusing the original tie-up unchanged is the most common error).
- Assuming an 8-shaft draft can always be mathematically folded into 4 shafts — many structures (satins, multi-block weaves, structures needing ≥6 shafts) cannot be reduced cleanly; recommend an alternative draft instead.
- Confusing rising shed and sinking shed conventions, causing the pattern to weave on the wrong (back) side of the cloth.
- For countermarche looms, only marking X's (lift) and omitting O's (sink) — countermarche tie-ups need both explicitly marked.
- When converting to doubleweave, forgetting to leave gaps for the second layer's threads, collapsing both layers into one.