Is 1-CSP only for 6000 mm bars?
No. 6000 mm is the usual mill length for aluminium and uPVC window profiles. You can enter another stock length if that is what you buy.
Guide · 1-CSP
One-dimensional cutting stock on mill-length window bars. Kerf, left/right trim, 45/45 miters, axial symmetry and remnant versus scrap decide how many 6000 mm extrusions a BOM uses.
1-CSP (the one-dimensional cutting stock problem) packs finished member lengths onto stock bars. For window shops the usual stock is a 6000 mm aluminium or uPVC extrusion. Glass and infill sheets are 2-CSP — use the sheet optimizer, not this method.
Kerf is the blade thickness lost between two cuts. Four 1485 mm members plus three 3 mm kerfs use 5949 mm of a 6000 mm bar (4 × 1485 + 3 × 3 = 5949). Start with 3 mm unless you have measured a different blade.
Some bars need a square-off at each end before the first useful cut. Left trim (LT) and right trim (RT) come off the stock before the nest. They are not part lengths and they are not kerf.
Frame and sash corners are usually 45° on both ends. Enter 45/45 on the member. Length is the finished length you need. FeneCAM does not invent extra miter allowance unless you add it to the length yourself.
Window profiles are not round bar. Axial symmetry tells the solver which way a member may flip on the bar. Values used in FeneCAM import are xyz, x, y, z and n.
Minimum remnant length (MR) is the shortest leftover you will put back in the rack. Leftover ≥ MR is a remnant. Shorter leftover is scrap. The homepage public demo shows a 1068 mm remnant; that demo is a different BOM and is illustrative, not a study.
Stock: 6000 mm. Kerf: 3 mm. MR: 1000 mm. Parts: 12 × 1485 mm and 12 × 1230 mm (45/45 on both, six casement frames on Aluminum Profile 6060).
| Pattern | Bars | Cuts | Kerf | Leftover |
|---|---|---|---|---|
| P1 | 3 | 4 × 1485 | 3 × 3 = 9 | 51 mm scrap |
| P2 | 3 | 4 × 1230 | 3 × 3 = 9 | 1071 mm remnant |
Total: 6 bars. Check: part length 32 580 + kerf 54 + scrap 153 + remnant 3213 = 36 000 (6 × 6000). Run the same BOM in the 1D profile optimizer.
Why P2 leftover is a remnant: 1071 ≥ MR 1000. Why P1 leftover is scrap: 51 < 1000.
One file can carry the job. Keys include N (name), M (material), K (kerf), S (stock), P (part). Example material: Aluminum Profile 6060. Full list: import manual.
N,Six casement frames M,Aluminum Profile 6060 K,3 S,6000,6 P,1485,12 P,1230,12
No. 6000 mm is the usual mill length for aluminium and uPVC window profiles. You can enter another stock length if that is what you buy.
No. Enter the finished member length. If your shop adds a miter allowance, put that extra in the length yourself.
More leftovers become remnants. In the worked plan, the 51 mm P1 leftover would still be scrap at MR 100. The 1071 mm P2 leftover stays a remnant at either setting.
No. Same 1-CSP method, separate stock lists. Glass is 2-CSP.
No. That homepage panel is an illustrative public demo on a different BOM (12 bars, 94.1% yield, 5.9% waste, remnant 1068 mm). It is not this six-casement plan and not a study.
Double-head vs single-head saws Open the 1D profile optimizer FeneCAM vs Opticutter