Laser Cutting Quotes: Nesting, Yield, and Run Time

Laser cutting quotes live or die on three numbers: how tightly parts nest on a sheet, the usable material yield that nesting produces, and the actual machine run time required to cut the job. Get one of them wrong and you either lose the order or lose margin on the parts you ship.

Why Nesting Strategy Changes the Quote

Nesting is not just a CAD task — it is a pricing decision. The way parts are arranged on a raw sheet determines scrap percentage, pierce count, and total cut path length. A tight nest can drop material cost by 10–15 percent on thin-gauge work, but it may increase lead time if the programmer needs an extra hour to optimize the layout.

Most shops default to automated nesting algorithms for speed. That works for simple rectangles and high-volume repeat jobs. For low-volume, high-mix work — especially when parts have irregular contours or require common-line cutting — manual intervention often pays off. The quote should reflect the nesting method you will actually use in production, not the theoretical best case.

Translating Nest Results Into Material Yield

Material yield is the percentage of the raw sheet that becomes sellable parts. It is calculated as total part area divided by sheet area. A 75 percent yield means 25 percent of the sheet goes to scrap, skeleton, or drop pieces that may or may not be reusable.

• Track actual yield by job. Compare the nested layout area to the sheet size you purchase. Build a small database of yield percentages by material, thickness, and part complexity.
• Account for drop utilization. If your shop routinely uses drops for smaller jobs, factor a credit into the yield calculation. If drops sit on the rack until they are scrapped, do not.
• Include kerf and clamp zones. The laser kerf (typically 0.1–0.3 mm) and machine clamp margins reduce usable sheet area. A 4×8 foot sheet rarely yields 32 square feet of cuttable area.

When the quote engine uses a single “material utilization” factor for every job, you systematically underquote complex nests and overquote simple ones.

Run Time: Pierce Count, Cut Length, and Assist Gas

Machine time is usually the largest cost driver after material. Three variables dominate run time:

1. Total cut length. Sum of all contour lengths in the nest, including internal features.
2. Pierce count. Every lead-in requires a pierce. On thick plate, a pierce can take 2–5 seconds. A nest with 500 parts adds 15–25 minutes of pure pierce time.
3. Assist gas and power settings. Nitrogen cutting stainless is slower than oxygen cutting mild steel. The quote must reference the actual process parameters for the material and thickness.

Many shops estimate run time by applying a blanket “minutes per inch” rate. That works until you quote 16-gauge stainless with 200 small holes versus 1/4-inch mild steel with three large profiles. The minutes-per-inch differs by a factor of three or more.

Building a Repeatable Quote Calculation

A reliable laser quoting workflow looks like this:

1. Import the part geometry (DXF, STEP, or drawing PDF).
2. Run the nest with the actual sheet size, grain direction constraints, and clamp margins.
3. Extract: total cut length, pierce count, sheet count, and drop sizes.
4. Apply material cost per sheet (including yield loss).
5. Apply machine rate per hour multiplied by calculated run time (cut length / feed rate + pierce count × pierce time).
6. Add setup, programming, handling, and overhead rates.
7. Apply target margin.

Steps 1–3 are where errors compound. If the nest is optimistic, material cost is low. If the run-time model ignores pierce time, labor and machine cost are low. The final price looks competitive but erodes profit.

Common Pitfalls That Shrink Margin

• Quoting theoretical yield. Using the CAD nest area without clamp margins or kerf compensation.
• Ignoring pierce time on high-part-count nests. A 1,000-part nest on 16-gauge can add an hour of pierce time.
• Using a single machine rate. Fiber laser cutting 10-gauge mild steel with oxygen is a different cost structure than cutting 1/2-inch stainless with nitrogen.
• Forgetting setup and changeover. Sheet load/unload, nozzle changes, and focus adjustments add 10–20 minutes per nest.

When to Automate the Quote

If your shop runs similar parts day after day — same materials, same thickness range, same nest patterns — a templated quote engine saves hours. For high-mix, low-volume work, the geometry varies too much for a static formula. The sweet spot is a quoting tool that can ingest a DXF, run a quick nest in the background, and output cut length, pierce count, and sheet count automatically. That data feeds the cost model without manual spreadsheet work.

Solvi’s instant quoting engine is built for exactly this workflow: it nests the parts, calculates true yield and run time, and applies your shop’s specific rates — turning a 30-minute quoting task into a 2-minute one. See how it works for laser cutting shops.

Bottom Line

Accurate laser quotes come from accurate nests, honest yield numbers, and run-time models that reflect pierce count and gas selection. Shops that invest in a repeatable calculation — whether spreadsheet-based or software-driven — win more jobs at sustainable margins. The alternative is guessing, and guessing eventually shows up on the P&L.