📐 6000mm Cut-List & m² RAB Estimator
How to Estimate Canopy m² Quotes & Optimize 6-Meter (6000mm) Hollow Steel Cut-Lists with Saw Kerf
6m Bar Cut-List & Fabrication Estimating•8 Min Read•Updated 2026-11-15
Key Workshop Takeaway:Cutting three 2000mm segments from a single 6000mm steel bar leaves the final piece ~6mm short because every chop-saw pass consumes 3mm of blade kerf. Accounting for kerf + First-Fit Decreasing packing prevents costly mid-job material runs.
1. First-Fit Decreasing (FFD) 6000mm Nesting with 3mm Saw Kerf
LasOS sorts required frame rafters, posts, and grilles from longest to shortest, packing shorter offcut pieces into remaining bar capacity while accounting for `kerfMm` (default `3mm`) between cuts on the same bar.
- Outputs exact `barsRequired`, `totalOffcutMm`, `wastePercent`, and a bar-by-bar cutting sheet for your shop saw operator.
- Safely flags and splits oversized spans exceeding `6000mm` into spliced segments.
2. Instant Area (`m²`) Costing & Official WhatsApp Client Proposals
Combine bar counts, roofing sheet cost per `m²`, welding electrodes/epoxy paint, and installation labor with your target margin percentage to generate an itemized quote and 1-tap WhatsApp proposal.
- Shows `recommendedQuotePrice`, `effectivePricePerM2`, and `estimatedNetProfit` side by side.
Shop-Floor Implementation Checklist
- Measure true span plus roof pitch overhang before generating your millimeter cut list.
- Keep `kerfMm: 3` set for standard 14-inch abrasive chop-saw wheels.
- Convert bulk 10-bar steel bundles in Stock so unit bar costs stay accurate.
Frequently Asked Questions
Can I change the stock bar length for 5800mm or 12000mm structural profiles?
Yes. `barLengthMm` and `kerfMm` are configurable per calculation and in your default workshop settings.
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