Quoting Multi-Process Parts Efficiently

Most shops can quote a simple CNC part or a straightforward 3D print in their sleep. But the moment a job needs turning, then milling, then heat treatment, then coating — or a hybrid build that splits between additive and subtractive — the quote turns into a spreadsheet nightmare. Miss one handoff, underestimate one setup, or forget one inspection point, and the margin evaporates.

Why Multi-Process Quotes Break Down

The problem isn’t complexity — it’s fragmentation. Each process lives in a different mental model: the machinist thinks in setups and tool changes, the additive operator thinks in build orientation and support removal, the finishing vendor thinks in batch sizes and cure times. When the estimator stitches them together manually, three things go wrong:

• Handoffs get missed. The output tolerance of process A becomes the input constraint for process B, but nobody wrote it down.
• Queue times disappear. Parts sit between operations for hours or days. That’s real lead time the customer sees, but the quote doesn’t.
• Scrap compounds. A 2% scrap rate per process across five operations means ~10% total yield loss. Most quotes assume 100% yield.

Structure the Quote by Operation, Not by Part

Stop quoting “the part.” Start quoting the sequence. Build a routing table — even a simple one — that lists every operation in order, with its own inputs, outputs, and constraints:

1. Operation ID — a short code (e.g., CNC-ROUGH, HT-STRESS, POWDER-COAT).
2. Process type — machining, additive, heat treat, coating, inspection, etc.
3. Machine / resource — which asset or vendor.
4. Setup time — fixturing, programming, calibration.
5. Run time — cycle time per piece.
6. Queue / wait time — realistic dwell between this op and the next.
7. Yield expectation — first-pass yield, rework rate, scrap rate.
8. Inspection gate — what gets checked before release to next op.

This table becomes the backbone of the quote. It forces visibility on every handoff and makes queue time explicit.

Capture Setup Once, Not Repeatedly

If a part visits the same 5-axis mill three times (rough, semi-finish, finish), the machine setup — probing, work offset, tool load — happens once. But the fixturing may change. Quote the first setup fully, then quote subsequent visits as re-fixturing + run time only. Same logic applies to additive: build plate prep happens once per build, not per part.

Many estimators double-count setup because they treat each operation in isolation. The routing table prevents this.

Model Vendor Lead Times, Not Just Your Shop

Outsourced processes (heat treat, plating, NDT, CMM) have their own calendars. A “2-day heat treat” vendor might only run loads on Tuesdays and Thursdays. If your parts finish machining on Wednesday, they wait until Thursday — three days of queue time. Quote the vendor’s actual schedule, not their marketing brochure. Build a small calendar lookup for each key vendor and reference it in the routing table.

Roll Up Scrap and Rework Correctly

Don’t add scrap percentages. Multiply yields. If five sequential operations each have 98% first-pass yield, the cumulative yield is 0.98^5 ≈ 90%. That means you need to start 111 parts to deliver 100 good ones. The extra 11 parts consume material, machine time, and handling at every step. Your quote must reflect the gross quantity at each operation, not the net order quantity.

Automate the Stitching

Doing this in a spreadsheet works for one quote. It fails at scale. A quoting engine that stores process templates — setup formulas, cycle-time models, yield tables, vendor calendars — lets you build the routing once, then apply it to any part that follows a similar sequence. Change the geometry inputs; the operations, handoffs, and compounding math update automatically. That’s how you go from hours to minutes without losing rigor.

Conclusion

Multi-process parts are where shops win or lose margin. The shops that quote them confidently aren’t guessing — they’re modeling the full sequence, every handoff, every queue, every yield loss. Solvi’s quoting engine builds that model for you, so complex routings become repeatable, accurate quotes in minutes. See how it works.