Why the same drawing comes back at three different prices

Send one titanium housing drawing to five machine shops and you can get $180, $310, $420, $650 and one polite decline. Same geometry, same material callout, same quantity. Buyers reasonably conclude that somebody is either gouging them or about to cut a corner.

Usually neither. The spread is real, and it comes from five specific places.

1. Material buying power

On exotic alloy parts, raw material is often 30 to 60 % of the price — a share that would be unthinkable on an aluminium bracket. So the shop’s material position dominates.

A shop with titanium bar already on the shelf, bought in a batch, quotes from that cost. A shop buying one length from a distributor for your job pays a premium and a cut charge. On nickel alloys the gap between mill-direct and one-off distributor pricing can be 40 % on its own.

This is also why quantity changes the price more than you expect. The break is often at the point where one more piece needs a second bar.

2. Whether they have done it before

A shop that runs Inconel weekly has proven cutting data, tooling on the shelf and an estimator who knows the cycle time within 10 %. A shop that has not runs a risk premium — or worse, does not, wins the job, and discovers the real cycle time halfway through.

The cheap quote in your inbox is sometimes the one from the shop that has not priced work hardening into the tooling cost. That price is not a bargain; it is the opening position of a conversation you will have later about a change order.

3. What they assumed about the ambiguity

Every incomplete drawing gets interpreted, and different estimators interpret differently.

If the drawing says “Inconel 718” without a condition, one shop quotes solution-treated bar and one quotes aged. If a general tolerance is missing, one assumes ISO 2768-m and one assumes the tightest callout applies throughout. If inspection requirements are unstated, one quotes a certificate of conformance and one quotes full AS9102 first article inspection.

Those three assumptions alone can double a price. None of them is dishonest. This is the single biggest source of spread, and the only one entirely within your control — see why your hard-material RFQ sits unquoted.

4. The process route they chose

For a hardened or precipitation-hardened part there is usually more than one valid route: machine soft and heat treat, or buy treated material and machine hard. Machine complete in one setup, or rough and finish in two with a stress relief between.

Each route has a different cost curve against quantity and tolerance. Two shops can both be right and land 40 % apart because one optimised for your stated quantity and one optimised for what it normally does.

5. Overhead and how badly they want work

A shop with a five-axis machine idle this month quotes differently from one running three shifts. A certified aerospace supplier carries documentation overhead on every job whether your part needs it or not. This is the part everyone assumes explains the whole spread. It usually explains the smallest share of it.

Where the shop is based changes the calculus too, though not in the direction most buyers assume — see Vietnam or China for exotic alloy machining.

How to read the spread

Throw out the outlier low, not the outlier high. On exotic alloys the suspiciously cheap quote is more often a misunderstanding than a bargain. Ask what material condition and what inspection level it assumed.

Ask every shop to state its assumptions. A quote that says “assumes ISO 2768-m general, solution treated bar, CoC only, EXW” is comparable. One that says “$310” is not.

Compare on total landed cost. EXW, FOB and DDP are different numbers — see the glossary if the Incoterm on a quote is unfamiliar. Freight on a dense nickel part is not trivial.

Ask what would make it cheaper. A shop that answers with two specific drawing changes understands your part. A shop that just offers a discount is bidding, not engineering.

Treat lead time as part of the price. A quote that is 15 % cheaper and six weeks later is not cheaper if the material is on a mill lead time nobody mentioned. See exotic alloy lead times.

What we do differently

We are a trading company, not a shop: we buy the machining from an audited shop in the network we manage and sell you the finished part, so there is no spread to read. Our engineer resolves the ambiguities above before the order is placed, the material is bought at the size we confirmed is available, stress relief and tooling are in the number where the geometry needs them, and the inspection before packing is ours. You issue one PO to us and receive one invoice from us.

You get one priced quote, within 24 business hours, that includes the price, the lead time with the material lead time stated separately, and anything on the drawing that is costing you money without buying you anything. Once the quotes are comparable, a small trial order is the next test of a supplier.

Send a drawing and get the one number that already includes everything above.