How to Quote Multi-Process Jobs

Most shops start with a single core capability — CNC machining, additive manufacturing, or sheet metal. Growth comes from layering on secondary processes: heat treatment, anodizing, tapping, inspection, assembly, packaging. The problem? Quoting each step in isolation misses the real cost drivers: handoffs, scheduling dependencies, cumulative tolerance stacks, and the administrative burden of managing outside vendors.

If you’re still adding a flat percentage markup per process, you’re leaving money on the table — or worse, winning jobs that lose money. Here’s how to build quotes that reflect the true complexity of multi-process work.

Map the Full Process Chain First

Before touching a calculator, document every operation from raw material to shipped part. Include in-house steps, outside processing (OSP), inspection points, and any customer-required documentation (FAI, PPAP, CoC). A typical chain might look like: laser cut → CNC mill → deburr → heat treat → surface grind → anodize → final inspection → bag and tag.

For each step, capture: process owner (internal or vendor), lead time, minimum lot charge, yield loss expectation, and any setup or fixture requirements. This map becomes your quoting backbone — and your production traveler template.

Quantify Handoff Costs, Not Just Processing Costs

Every transition between processes carries hidden costs: material handling, WIP tracking, quality checks, packaging for transport, vendor coordination emails, and schedule buffering. Internal handoffs might cost 15–30 minutes of admin time each. External handoffs add shipping, receiving inspection, and vendor management overhead.

Assign a discrete line item for each handoff in your quote. Even a nominal $25–$50 per internal transfer and $75–$150 per external vendor trip forces visibility. It also gives you a lever when customers ask to split orders across vendors — you can show the exact cost of each additional handoff.

Model Cumulative Yield Loss

Single-process yield might be 98%. Chain five processes at 98% each and your effective yield drops to 90%. That means quoting for 111 parts to deliver 100 good units. Most shops quote for 102–105 and absorb the scrap.

Build a yield waterfall into your quote calculator. Start with required good quantity, then work backward through each process using realistic first-pass yield data. If you don’t have historical data, start with conservative estimates: 95% for machining, 90% for additive, 97% for finishing, 99% for inspection. Refine over time.

Account for Tolerance Stack-Up Risk

Each process contributes variation. A ±0.005″ machining tolerance followed by ±0.002″ grinding capability doesn’t guarantee ±0.007″ final — it guarantees statistical stack-up. If the final assembly requires ±0.005″ true position, you may need tighter intermediate specs or 100% inspection at intermediate steps.

Quote the inspection strategy that matches the risk: in-process CMM checks, first-article on critical features, or statistical process control. Don’t quote “inspection included” as a blanket — specify what, when, and to what standard. The customer paying for aerospace FAI expects different rigor than a prototype run.

Schedule Backwards from the Hardest Constraint

Multi-process jobs live or die by the longest lead time — usually outside processing. Heat treat might be 3 days processing but 2 weeks queue time. Anodize vendors often have 5-day minimums. Your quote’s promised lead time must reflect the critical path, not your internal capacity.

Build a simple Gantt view into the quote: show each process block, vendor lead times, and required buffer days. This doubles as a production schedule if you win the job. It also exposes where expedite fees will hit — letting you quote standard vs. rush options with real numbers.

Bundle or Unbundle Strategically

Some customers want a single lump-sum price. Others demand line-item transparency for their own cost analysis. Offer both: a summary total with an optional detailed breakdown appendix. Keep your internal cost model granular regardless — you need the detail for margin analysis and future quoting reference.

For repeat multi-process programs, consider a “program price” that amortizes setup, fixture, and first-article costs over the expected annual volume. Quote the first order at full cost recovery, then show the reduced per-unit price at volume. This wins long-term agreements and locks out competitors.

Conclusion

Multi-process quoting isn’t about adding up individual process prices — it’s about modeling the system: handoffs, yield erosion, tolerance accumulation, and schedule risk. Shops that master this win more complex, higher-margin work because their quotes reflect reality, not optimism.

Solvi’s quoting engine lets you build reusable multi-process templates with yield waterfalls, handoff line items, and vendor lead-time logic — so every complex quote starts from a solid foundation, not a blank spreadsheet. See how it works.