QuotedPartCost guides · Updated 2026-10-30
Why does one prototype cost so much more than a production part?
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A prototype carries the same programming, fixturing, setup, inspection, and material minimums that a production lot can spread across many parts. This engine example uses one 6061 bracket at quantities 1 and 100 and shows each cost line rather than applying an unexplained prototype multiplier.
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The fictional bracket has two setups, a pocket, tapped holes, and a general tolerance. CAM programming, tool selection, workholding, proving the program, and first-piece inspection are lot work. At quantity one, those costs land on one invoice; at quantity 100, they are divided over the lot.
Material minimums can also matter. A one-off blank may be cut from a larger piece than the finished part needs, while a production order can buy a more efficient bar or nest.
- Separate programming from run time.
- Ask who owns the workholding and program.
- State whether first-article inspection is included.
Prototype and production are different risks
A prototype quote has uncertainty around tool access, datum strategy, surface finish, and drawing interpretation. A production quote has uncertainty around repeatability, inspection sampling, and replenishment. The pricing model numbers are useful because they expose the arithmetic, but the estimator still needs to price the right risk.
Do not promise that the quantity-100 unit price is available for a one-part order. The lot setup remains real even when a customer asks for it to be hidden.
- Mark assumptions that need a design review.
- Use a change-order path for drawing revisions.
- Keep inspection and outside work explicit.
Turn a prototype into a better next quote
After the first run, record actual setup and cycle minutes, material yield, tool use, and inspection effort. Feed those observations into the shop's rate or operation edits. The next quantity break should be based on measured work, not on a hopeful percentage reduction.
A buyer can lower the eventual production price by releasing a stable drawing, allowing a sensible stock form, and grouping demand. The quote should show which of those choices changes the number.
- Capture actuals by operation.
- Freeze revision and material condition.
- Ask for a blanket order when demand is real.
Use the result as an estimator's starting point
For this prototype machining cost: why one part costs more than 100 example, an estimator can challenge every cnc milling input. Replace this fictional geometry with the customer's STEP file or drawing, then replace the catalog stock price, work-center rate, setup minutes, and markup with the shop's current 3-axis vmc values.
Keep the lot setup visible when you send this quote for prototype machining cost: why one part costs more than 100. Confirm stock form, material condition, tolerances, inspection, deburr, and outside-process timing before promising a ship date. If one of those inputs changes, rerun the calculation and show the buyer what moved.
- Show both unit and lot totals.
- Label illustrative values clearly.
- Have the estimator review access, tooling, and first-piece risk.
Prototype versus production quantity for the same reference part
- • Material: Aluminum 6061-T6; the US catalog input is $9.50/lb and machinability 1.00 relative to 6061-T6.
- • Process: CNC milling; the pricing model includes CAM programming, 12 toolpaths, Mill, 3 setups, Deburr, Inspect and calculates the quantities shown.
- • Geometry: 4 × 3 × 1 in; Fictional 4 × 3 × 1 in prismatic reference part. Two mill setups are inferred from the top and side features.
- • Markup: 30% catalog default. Taxes, freight, customer-specific rates, and unlisted outside services are excluded.
- • Every dollar and minute in the table is a reproducible example from the stated inputs, not a market average or supplier promise.
| Quantity | Setup min (lot) | Run min (part) | Material / part | Machine + labor / part | Outside / part | Quoted / part | Lot quote | Lead days |
|---|---|---|---|---|---|---|---|---|
| 1 | 191.0 | 13.5 | $45.00 | $19.25 | $0.00 | $464.53 | $464.53 | 11 |
| 100 | 191.0 | 13.5 | $9.49 | $19.25 | $0.00 | $41.17 | $4117.00 | 14 |
Sources and limits
Claims are dated where they can change. Product calculations are examples from the stated inputs, not a promise about a customer's quote. Competitor wording is attributed to the source shown.
- The stock price input is taken from the US catalog, which records an Online Metals check on 2026-10-21. — source (checked 2026-10-21)
Questions
Is this a guaranteed 6061-t6 aluminum quote?
No. It is a transparent estimating example. Replace the example inputs with the customer's drawing, stock quote, current shop rates, and inspection or finish requirements.
Why does quantity change the unit price?
Setup and programming are lot costs. The pricing calculation spreads those costs across the stated quantity and keeps the per-part run time and material inputs visible.
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